--- title: "Changes to Create Training Run Route" method: POST path: "/api/v1/train" --- # Changes to Create Training Run Route `POST /api/v1/train` > Every recorded change to this operation, newest first. ## Timeline Changed in 37 of 63 revisions. - **2026-11-02** `5b5a8ae4b4a4`: 5 info - **2026-11-02** `ac63eff4913f`: 1 breaking, 21 warning, 23 info - **2026-10-31** `7b218d495d5c`: 1 breaking, 1 info - **2026-10-23** `0a17f8723be0`: 4 info - **2026-10-23** `a99a7b2a5444`: 8 info - **2026-10-21** `cac0bc23e466`: 2 info - **2026-10-20** `d2a2f0337945`: 2 breaking, 1 warning, 2 info - **2026-10-19** `1b4f7d95e884`: 1 breaking, 2 warning, 2 info - **2026-10-18** `db33cd63ac53`: 1 info - **2026-10-17** `30d547077e65`: 4 info - **2026-10-15** `7f7a777f5bb4`: 3 warning, 3 info - **2026-10-14** `a9423fc3918b`: 1 breaking - **2026-10-13** `cdeafc877c06`: 3 info - **2026-10-09** `d7af7940d2fc`: 1 warning - **2026-10-07** `db059a2d3fb0`: 1 info - **2026-10-06** `358e551babca`: 5 info - **2026-10-02** `a0e690b1ef27`: 1 breaking, 2 warning, 3 info - **2026-10-02** `21079efbf349`: 3 breaking, 15 warning, 5 info - **2026-09-30** `9182aecc931a`: 2 info - **2026-09-29** `8c9311580b72`: 5 info - **2026-09-28** `1efa21f7aeb8`: 2 info - **2026-09-26** `9c094527854e`: 1 breaking, 5 warning, 32 info - **2026-09-25** `ae26a0c95c43`: 14 breaking, 30 warning, 19 info - **2026-09-24** `4087cc7a74aa`: 1 info - **2026-09-23** `1f15ecf92088`: 4 warning, 3 info - **2026-09-22** `aea928d034f7`: 4 info - **2026-09-21** `59e078d20686`: 6 breaking, 1 warning, 1 info - **2026-09-19** `290842c6677f`: 2 info - **2026-09-17** `2fd6ebd68ce3`: 1 info - **2026-09-17** `5180e731a1e3`: 1 warning - **2026-09-14** `c3675ebed003`: 1 warning, 3 info - **2026-09-13** `84f95d9609c2`: 3 info - **2026-09-13** `6b2989fa1560`: 7 info - **2026-09-11** `8cb70690e5bc`: 10 breaking, 2 info - **2026-09-10** `4fda12be7f4e`: 1 breaking, 1 info - **2026-09-09** `f9c017dc9300`: 2 info - **2026-09-06** `43d48506a5ad`: 1 info ## Changes - **2026-11-02** `5b5a8ae4b4a4`: 5 info - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_max_output_tokens_per_trajectory` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_max_output_tokens_per_turn` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_max_turns_per_trajectory` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_trajectory_timeout_seconds` - the `options/anyOf[subschema #1: RunOptions]/max_concurrent_trajectories/anyOf[subschema #1]/` request property's max was increased from `512.00` to `1024.00` - **2026-11-02** `ac63eff4913f`: 1 breaking, 21 warning, 23 info - removed the enum value `reinforce_plus_plus` of the request property `options/anyOf[subschema #1: RunOptions]/algorithm/anyOf[subschema #1: TrainingAlgorithm]/` - removed the request property `options/anyOf[subschema #1: RunOptions]/batch_collection_idle_timeout_seconds` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_collection_timeout_seconds` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_enabled` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_frequency` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_max_active_rollouts` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_max_samples` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_reasoning_effort` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_samples_per_task` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_temperature` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_top_k` - removed the request property `options/anyOf[subschema #1: RunOptions]/evaluation_top_p` - removed the request property `options/anyOf[subschema #1: RunOptions]/execution_timeout_seconds` - removed the request property `options/anyOf[subschema #1: RunOptions]/intelligent_density_training` - removed the request property `options/anyOf[subschema #1: RunOptions]/max_active_rollouts` - removed the request property `options/anyOf[subschema #1: RunOptions]/max_output_tokens_per_step` - removed the request property `options/anyOf[subschema #1: RunOptions]/max_steps_off_policy` - removed the request property `options/anyOf[subschema #1: RunOptions]/max_total_tokens_per_trajectory` - removed the request property `options/anyOf[subschema #1: RunOptions]/min_lr_ratio` - removed the request property `options/anyOf[subschema #1: RunOptions]/min_samples_per_group` - removed the request property `options/anyOf[subschema #1: RunOptions]/samples_per_instance` - removed the request property `options/anyOf[subschema #1: RunOptions]/train_batch_size` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/batch_size` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/batch_timeout_seconds` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/density_aware_training` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/lr_min_ratio` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/max_concurrent_trajectories` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/max_output_tokens_per_trajectory` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/max_output_tokens_per_turn` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/max_staleness` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/min_trajectories_per_group` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/train_on_all_fail` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/train_on_all_pass` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/train_on_zero_advantage` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/trajectory_timeout_seconds` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_enabled` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_final_wait_timeout_seconds` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_interval_steps` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_max_concurrent_trajectories` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/val_num_tasks` - …5 more - **2026-10-31** `7b218d495d5c`: 1 breaking, 1 info - removed the enum value `qwen/qwen3-235b-a22b` of the request property `base_model_slug` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/load_weights_only` - **2026-10-23** `0a17f8723be0`: 4 info - added the new optional request property `options/anyOf[subschema #1: RunOptions]/group_size` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/min_samples_per_group` - request property `options/anyOf[subschema #1: RunOptions]/samples_per_instance` deprecated - the `options/anyOf[subschema #1: RunOptions]/max_total_tokens_per_trajectory/anyOf[subschema #1]/` request property's min was decreased from `1024.00` to `1.00` - **2026-10-23** `a99a7b2a5444`: 8 info - added the new optional request property `options/anyOf[subschema #1: RunOptions]/evaluation_reasoning_effort` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/evaluation_temperature` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/evaluation_top_k` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/evaluation_top_p` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/temperature` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/top_k` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/top_p` - the `options/anyOf[subschema #1: RunOptions]/max_total_tokens_per_trajectory/anyOf[subschema #1]/` request property's max was increased from `262144.00` to `2097152.00` - **2026-10-21** `cac0bc23e466`: 2 info - added the new optional request property `options/anyOf[subschema #1: RunOptions]/evaluation_frequency` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/max_steps_off_policy` - **2026-10-20** `d2a2f0337945`: 2 breaking, 1 warning, 2 info - `header` request parameter `Idempotency-Key` list-of-types was narrowed by removing types `null` - for the `header` request parameter `Idempotency-Key`, the minLength was increased from `0` to `1` - for the `header` request parameter `Idempotency-Key`, the maxLength was set to `256` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/evaluation_enabled` - for the `header` request parameter `Idempotency-Key`, the type was generalized from no type to `string` - **2026-10-19** `1b4f7d95e884`: 1 breaking, 2 warning, 2 info - removed the enum value `none` of the request property `options/anyOf[subschema #1: RunOptions]/reasoning_effort/anyOf[subschema #1]/` - removed the request property `options/anyOf[subschema #1: RunOptions]/disable_thinking` - removed the request property `options/anyOf[subschema #1: RunOptions]/n_parallel_agents` - added the new `off` enum value to the request property `options/anyOf[subschema #1: RunOptions]/reasoning_effort/anyOf[subschema #1]/` - added the new `on` enum value to the request property `options/anyOf[subschema #1: RunOptions]/reasoning_effort/anyOf[subschema #1]/` - **2026-10-18** `db33cd63ac53`: 1 info - added the new optional request property `options/anyOf[subschema #1: RunOptions]/max_active_rollouts` - **2026-10-17** `30d547077e65`: 4 info - added the new optional request property `options/anyOf[subschema #1: RunOptions]/reasoning_effort` - added the new `openai/gpt-6-astra` enum value to the request property `base_model_slug` - added the new `openai/gpt-6-sol` enum value to the request property `base_model_slug` - added the new `openai/gpt-6.1-sol` enum value to the request property `base_model_slug` - **2026-10-15** `7f7a777f5bb4`: 3 warning, 3 info - removed the request property `options/anyOf[subschema #1: RunOptions]/max_response_chars_per_tool_call` - removed the request property `options/anyOf[subschema #1: RunOptions]/max_tool_calls_per_step` - removed the request property `options/anyOf[subschema #1: RunOptions]/train_on_ungraded` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/train_on_error` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/train_on_timeout` - added the new `z-ai/glm-5.3-flash` enum value to the request property `base_model_slug` - **2026-10-14** `a9423fc3918b`: 1 breaking - removed the enum value `Qwen/Qwen3.6-27B` of the request property `base_model_slug` - **2026-10-13** `cdeafc877c06`: 3 info - the `options/anyOf[subschema #1: RunOptions]/lr_hold_steps/anyOf[subschema #1]/` request property's max was increased from `400.00` to `100000.00` - the `options/anyOf[subschema #1: RunOptions]/lr_warmup_steps/anyOf[subschema #1]/` request property's max was increased from `400.00` to `100000.00` - the `options/anyOf[subschema #1: RunOptions]/num_steps/anyOf[subschema #1]/` request property's max was increased from `400.00` to `100000.00` - **2026-10-09** `d7af7940d2fc`: 1 warning - removed the request property `options/anyOf[subschema #1: RunOptions]/retries` - **2026-10-07** `db059a2d3fb0`: 1 info - added the new optional request property `options/anyOf[subschema #1: RunOptions]/retries` - **2026-10-06** `358e551babca`: 5 info - added the new optional request property `agent_name` - added the new optional request property `benchmark_name` - added the new optional request property `options/anyOf[subschema #1: RunOptions]/intelligent_density_training` - the request property `bench_id` became optional - request property `bench_id` list-of-types was widened by adding types `null` to media type `application/json` - **2026-10-02** `a0e690b1ef27`: 1 breaking, 2 warning, 3 info - added the new required request property `base_model_slug` - removed the request property `base_model_id` - removed the request property `training_options` - added the new optional request property `bypass_ownership` - added the new optional request property `display_name` - added the new optional request property `options` - **2026-10-02** `21079efbf349`: 3 breaking, 15 warning, 5 info - the `training_options/max_response_chars_per_tool_call/anyOf[subschema #1]/` request property's min was increased to `128.00` - the `training_options/max_total_tokens_per_trajectory/anyOf[subschema #1]/` request property's min was increased to `1024.00` - the `training_options/samples_per_instance/anyOf[subschema #1]/` request property's min was increased to `4.00` - the `training_options/learning_rate/anyOf[subschema #1]/` request property's max was set to `0.01` - the `training_options/lr_hold_steps/anyOf[subschema #1]/` request property's max was set to `400.00` - the `training_options/lr_warmup_steps/anyOf[subschema #1]/` request property's max was set to `400.00` - the `training_options/max_output_tokens_per_step/anyOf[subschema #1]/` request property's max was set to `262144.00` - the `training_options/max_response_chars_per_tool_call/anyOf[subschema #1]/` request property's max was set to `10000000.00` - the `training_options/max_tool_calls_per_step/anyOf[subschema #1]/` request property's max was set to `20.00` - the `training_options/max_total_tokens_per_trajectory/anyOf[subschema #1]/` request property's max was set to `262144.00` - the `training_options/max_turns_per_trajectory/anyOf[subschema #1]/` request property's max was set to `300.00` - the `training_options/n_parallel_agents/anyOf[subschema #1]/` request property's max was set to `512.00` - the `training_options/num_steps/anyOf[subschema #1]/` request property's max was set to `400.00` - the `training_options/samples_per_instance/anyOf[subschema #1]/` request property's max was set to `32.00` - the `training_options/train_batch_size/anyOf[subschema #1]/` request property's max was set to `256.00` - the `training_options/learning_rate/anyOf[subschema #1]/` request property's min was set to `0.00` - removed the request property `training_options/eval_final_collection_timeout_seconds` - removed the request property `training_options/overrides` - added the new optional request property `training_options/evaluation_collection_timeout_seconds` - added the new optional request property `training_options/evaluation_max_active_rollouts` - added the new optional request property `training_options/evaluation_max_samples` - added the new optional request property `training_options/evaluation_samples_per_task` - added the new `qwen/qwen3-235b-a22b` enum value to the request property `base_model_id` - **2026-09-30** `9182aecc931a`: 2 info - added the new `moonshotai/kimi-k3` enum value to the request property `base_model_id` - added the new `z-ai/glm-5.3` enum value to the request property `base_model_id` - **2026-09-29** `8c9311580b72`: 5 info - added the new `anthropic/claude-opus-5.5` enum value to the request property `base_model_id` - added the new `anthropic/claude-sonnet-5.5` enum value to the request property `base_model_id` - added the new `openai/gpt-5.6-luna` enum value to the request property `base_model_id` - added the new `openai/gpt-5.6-sol` enum value to the request property `base_model_id` - added the new `thinkingmachines/Inkling-Small` enum value to the request property `base_model_id` - **2026-09-28** `1efa21f7aeb8`: 2 info - added the new optional request property `agent_id` - the request property `training_options` became optional - **2026-09-26** `9c094527854e`: 1 breaking, 5 warning, 32 info - the request property `training_options` became required - the optional response header `X-Trajectory-Training-Created` removed for the status `202` - removed the request property `training_options/max_active_rollouts` - removed the request property `training_options/reject_all_fail` - removed the request property `training_options/reject_all_pass` - removed the request property `training_options/reject_zero_advantage` - added the new optional request property `training_options/max_tool_calls_per_step` - added the new optional request property `training_options/max_total_tokens_per_trajectory` - added the new optional request property `training_options/n_parallel_agents` - added the new optional request property `training_options/overrides` - the `batch_collection_idle_timeout_seconds` request property default value `9600` was removed - the `disable_thinking` request property default value `false` was removed - the `eval_final_collection_timeout_seconds` request property default value `7200` was removed - the `execution_timeout_seconds` request property default value `7200` was removed - the `learning_rate` request property default value `0.0001` was removed - the `lr_hold_steps` request property default value `135` was removed - the `lr_warmup_steps` request property default value `15` was removed - the `max_output_tokens_per_step` request property default value `16384` was removed - the `max_response_chars_per_tool_call` request property default value `16384` was removed - the `max_turns_per_trajectory` request property default value `125` was removed - the `min_lr_ratio` request property default value `0.1` was removed - the `num_steps` request property default value `100` was removed - the `samples_per_instance` request property default value `8` was removed - the `train_batch_size` request property default value `32` was removed - request property `training_options/batch_collection_idle_timeout_seconds` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/disable_thinking` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/eval_final_collection_timeout_seconds` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/execution_timeout_seconds` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/learning_rate` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/lr_hold_steps` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/lr_warmup_steps` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/max_output_tokens_per_step` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/max_response_chars_per_tool_call` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/max_turns_per_trajectory` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/min_lr_ratio` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/num_steps` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/samples_per_instance` list-of-types was widened by adding types `null` to media type `application/json` - request property `training_options/train_batch_size` list-of-types was widened by adding types `null` to media type `application/json` - **2026-09-25** `ae26a0c95c43`: 14 breaking, 30 warning, 19 info - request property `training_options/batch_collection_idle_timeout_seconds` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/disable_thinking` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/eval_final_collection_timeout_seconds` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/execution_timeout_seconds` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/learning_rate` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/lr_hold_steps` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/lr_warmup_steps` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/max_output_tokens_per_step` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/max_response_chars_per_tool_call` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/max_turns_per_trajectory` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/min_lr_ratio` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/num_steps` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/samples_per_instance` list-of-types was narrowed by removing types `null` from media type `application/json` - request property `training_options/train_batch_size` list-of-types was narrowed by removing types `null` from media type `application/json` - the `training_options/batch_collection_idle_timeout_seconds` request property's max was set to `38400.00` - the `training_options/eval_final_collection_timeout_seconds` request property's max was set to `38400.00` - the `training_options/execution_timeout_seconds` request property's max was set to `36000.00` - the `training_options/learning_rate` request property's max was set to `0.01` - the `training_options/lr_hold_steps` request property's max was set to `400.00` - the `training_options/lr_warmup_steps` request property's max was set to `400.00` - the `training_options/max_output_tokens_per_step` request property's max was set to `262112.00` - the `training_options/max_response_chars_per_tool_call` request property's max was set to `65536.00` - the `training_options/max_turns_per_trajectory` request property's max was set to `300.00` - the `training_options/min_lr_ratio` request property's max was set to `1.00` - the `training_options/num_steps` request property's max was set to `400.00` - the `training_options/samples_per_instance` request property's max was set to `64.00` - the `training_options/train_batch_size` request property's max was set to `256.00` - the `training_options/batch_collection_idle_timeout_seconds` request property's min was set to `1.00` - the `training_options/eval_final_collection_timeout_seconds` request property's min was set to `1.00` - the `training_options/execution_timeout_seconds` request property's min was set to `1.00` - the `training_options/learning_rate` request property's min was set to `0.00` - the `training_options/lr_hold_steps` request property's min was set to `0.00` - the `training_options/lr_warmup_steps` request property's min was set to `0.00` - the `training_options/max_output_tokens_per_step` request property's min was set to `1.00` - the `training_options/max_response_chars_per_tool_call` request property's min was set to `128.00` - the `training_options/max_turns_per_trajectory` request property's min was set to `1.00` - the `training_options/min_lr_ratio` request property's min was set to `0.00` - the `training_options/num_steps` request property's min was set to `1.00` - the `training_options/samples_per_instance` request property's min was set to `4.00` - the `training_options/train_batch_size` request property's min was set to `1.00` - …23 more - **2026-09-24** `4087cc7a74aa`: 1 info - added the new optional request property `training_options/overrides` - **2026-09-23** `1f15ecf92088`: 4 warning, 3 info - removed the request property `training_options/reject_all_fail` - removed the request property `training_options/reject_all_pass` - removed the request property `training_options/reject_zero_advantage` - removed the request property `training_options/samples_per_prompt` - added the new optional request property `training_options/samples_per_instance` - added the new `Qwen/Qwen3.6-27B` enum value to the request property `base_model_id` - added the new `Qwen/Qwen3.8-27B` enum value to the request property `base_model_id` - **2026-09-22** `aea928d034f7`: 4 info - added the new optional request property `training_options/reject_all_fail` - added the new optional request property `training_options/reject_all_pass` - added the new optional request property `training_options/reject_zero_advantage` - added the new optional request property `training_options/samples_per_prompt` - **2026-09-21** `59e078d20686`: 6 breaking, 1 warning, 1 info - the `training_options/eval_final_collection_timeout_seconds/anyOf[subschema #1]/` request property's max was decreased to `38400.00` - the `training_options/execution_timeout_seconds/anyOf[subschema #1]/` request property's max was decreased to `36000.00` - removed the required property `execution_id` from the response with the `202` status - removed the required property `experiment_name` from the response with the `202` status - removed the required property `pipeline_name` from the response with the `202` status - removed the required property `pipeline_run_id` from the response with the `202` status - removed the optional property `resolved_training_options` from the response with the `202` status - added the new optional request property `parent_checkpoint_id` - **2026-09-19** `290842c6677f`: 2 info - the `training_options/eval_final_collection_timeout_seconds/anyOf[subschema #1]/` request property's max was increased from `38400.00` to `96000.00` - the `training_options/execution_timeout_seconds/anyOf[subschema #1]/` request property's max was increased from `36000.00` to `93600.00` - **2026-09-17** `2fd6ebd68ce3`: 1 info - added the optional property `resolved_training_options` to the response with the `202` status - **2026-09-17** `5180e731a1e3`: 1 warning - removed the optional property `resolved_training_options` from the response with the `202` status - **2026-09-14** `c3675ebed003`: 1 warning, 3 info - removed the request property `training_options/no_progress_timeout_seconds` - added the new optional request property `training_options/batch_collection_idle_timeout_seconds` - the `disable_thinking` request property default value `false` was removed - request property `training_options/disable_thinking` list-of-types was widened by adding types `null` to media type `application/json` - **2026-09-13** `84f95d9609c2`: 3 info - the `training_options/eval_final_collection_timeout_seconds/anyOf[subschema #1]/` request property's max was increased from `36000.00` to `38400.00` - the `training_options/no_progress_timeout_seconds/anyOf[subschema #1]/` request property's max was increased from `36000.00` to `38400.00` - added the optional property `resolved_training_options` to the response with the `202` status - **2026-09-13** `6b2989fa1560`: 7 info - added the new optional request property `training_options/eval_final_collection_timeout_seconds` - added the new optional request property `training_options/execution_timeout_seconds` - added the new optional request property `training_options/learning_rate` - added the new optional request property `training_options/lr_hold_steps` - added the new optional request property `training_options/lr_warmup_steps` - added the new optional request property `training_options/min_lr_ratio` - added the new optional request property `training_options/no_progress_timeout_seconds` - **2026-09-11** `8cb70690e5bc`: 10 breaking, 2 info - response property `execution_id` list-of-types was widened by adding types `null` to media type `application/json` of response `202` - response property `pipeline_name` list-of-types was widened by adding types `null` to media type `application/json` of response `202` - response property `pipeline_run_id` list-of-types was widened by adding types `null` to media type `application/json` of response `202` - the `resolved_trajectory_options` response's property type changed from `object` to no type for status `202` - removed the required property `resolved_trajectory_options/max_output_tokens_per_step` from the response with the `202` status - removed the required property `resolved_trajectory_options/max_response_chars_per_tool_call` from the response with the `202` status - removed the required property `resolved_trajectory_options/max_tool_calls_per_step` from the response with the `202` status - removed the required property `resolved_trajectory_options/max_total_tokens_per_trajectory` from the response with the `202` status - removed the required property `resolved_trajectory_options/max_turns_per_trajectory` from the response with the `202` status - removed the required property `resolved_trajectory_options/timeout_seconds` from the response with the `202` status - added the new optional `header` request parameter `Idempotency-Key` - added `#/components/schemas/ResolvedTrajectoryTrainingOptions, subschema #2` to the `resolved_trajectory_options` response property `anyOf` list for the response status `202` - **2026-09-10** `4fda12be7f4e`: 1 breaking, 1 info - the request property `training_options` became required - added the new optional request property `training_options/disable_thinking` - **2026-09-09** `f9c017dc9300`: 2 info - added the new optional request property `training_options/n_parallel_agents` - added the new optional request property `training_options/train_batch_size` - **2026-09-06** `43d48506a5ad`: 1 info - added the new optional request property `training_options/num_steps` --- [Operation](https://skmtc.dev/trajectory/apis/trajectory-api/docs/api/v1/train/post.md) - [API](https://skmtc.dev/trajectory/apis/trajectory-api.md) - [Page](https://skmtc.dev/trajectory/apis/trajectory-api/changes/api/v1/train/post)