---
title: "Changes to Optimizer step"
method: POST
path: "/rl/training-sessions/{session_id}/operations/optim-step"
---

# Changes to Optimizer step

`POST /rl/training-sessions/{session_id}/operations/optim-step`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 4 of 15 revisions.

- **2026-08-08** `f26a23fab8e0` — 1 warning
- **2026-08-04** `ebd4756a41e4` — 1 warning
- **2026-07-31** `9ccc57e5e4b9` — 3 warning, 3 info
- **2026-07-26** `0c4fdad77435` — 3 warning, 11 info

## Changes

- **2026-08-08** `f26a23fab8e0` — 1 warning
  - removed the request property `weight_sync_type`
- **2026-08-04** `ebd4756a41e4` — 1 warning
  - added the new `TRAINING_OPERATION_ERROR_CODE_NON_FINITE_LOSS` enum value to the `error/code` response property for the response status `200`
- **2026-07-31** `9ccc57e5e4b9` — 3 warning, 3 info
  - removed the request property `adamw_params`
  - removed the request property `max_grad_norm`
  - removed the request property `muon_params/adamw`
  - added the new optional request property `adam_params`
  - added the new optional request property `muon_params/adam`
  - added the new optional request property `muon_params/grad_clip_norm`
- **2026-07-26** `0c4fdad77435` — 3 warning, 11 info
  - removed the request property `adamw_params/lr`
  - removed the request property `learning_rate`
  - removed the request property `muon_params/lr`
  - added the new optional request property `adamw_params/learning_rate`
  - added the new optional request property `muon_params/adamw`
  - added the new optional request property `muon_params/learning_rate`
  - the `max_grad_norm` request property default value `1.0` was added
  - the `adamw_params/beta1` request property format was generalized from `float` to no format
  - the `adamw_params/beta2` request property format was generalized from `float` to no format
  - the `adamw_params/eps` request property format was generalized from `float` to no format
  - the `adamw_params/weight_decay` request property format was generalized from `float` to no format
  - the `muon_params/momentum` request property format was generalized from `float` to no format
  - the `muon_params/newton_schulz_steps` request property format was generalized from `int64` to no format
  - the `muon_params/weight_decay` request property format was generalized from `float` to no format

---

[Operation](https://skmtc.dev/together/apis/together-apis/docs/rl/training-sessions/:session_id/operations/optim-step/post.md) · [API](https://skmtc.dev/together/apis/together-apis.md) · [Page](https://skmtc.dev/together/apis/together-apis/changes/rl/training-sessions/:session_id/operations/optim-step/post)