annotation26

annotation_queue24

annotation_queue_records14

api_keys9

assistant17

auth46

code-metric-generation2

codex-cost-per-credit5

component_views7

custom_dashboards14

data87

dataset1

datasets87

experiment27

experiment_group7

experiment_tags5

feedback28

groups33

health7

integrations96

jobs1

llm_integrations5

log_stream27

log_stream_alert_settings5

log_stream_alerts5

logstream-insights23

metric_roll_up5

models5

Organization Jobs4

organizations6

playground_prompts5

playground_snapshots3

playgrounds7

project_settings2

projects47

prompts29

protect9

provider-management-api-integrations5

run_insights_settings6

run_scorer_settings3

run_tags5

runs7

scorer4

scorer-feedback12

system_admin1

system_users7

system_users_authentication3

tokenomics33

trace95

trends_dashboard39

users34

versions1

getList Audit Logs

assistant

Send Message

Send a message to the conversation and stream the assistant's response as SSE events.

404s if the conversation does not exist or is not owned by the caller. 409s if message_id was already submitted (the field is the client-side idempotency key).

post/assistant/conversations/{conversation_id}/messages

Path parameters

conversation_idstring uuid4 required

Request body

message_idstring uuid4 required

Client-generated UUID for this user message. Echoed back in the SSE start event as message_id.

messagestring required

The user's message text.

parent_message_idstring uuid4 nullable

ID of the message this branches from. Null for the first message in a conversation.

modelstring nullable

Explicit Galileo integration model alias. Null is reserved for an O11y delegated turn carrying both external correlation identifiers.

Response

Successful Response

Changes

Changed in 3 of the 15 revisions of this API.8

Aug 13, 2026344acdc36dbb4See the full diff
- ○
  added the new optional request property
  new-optional-request-property
- ○
  added the new optional request property
  new-optional-request-property
- ○
  added signal discriminator mapping keys to the / request property
  request-property-discriminator-mapping-added
- ○
  added to the / request property oneOf list
  request-property-one-of-added
This revision also has 44 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog
Aug 6, 2026933e8c8e63661See the full diff
- ○
  added the new optional request property ///
  new-optional-request-property
This revision also has 8 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog
Jul 26, 202605003e7835a23See the full diff
- ○
  the endpoint scheme security ClassicAPIKeyHeader was added to the API
  api-security-added
- ○
  added page discriminator mapping keys to the / request property
  request-property-discriminator-mapping-added
- ○
  added to the / request property oneOf list
  request-property-one-of-added
This revision also has 15 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog

Full history