MOSH-1979: Sync RL API OpenAPI spec with latest shaping protos to incorporate training checkpoint saving/resuming

[sbassam]

Summary

Syncs the OpenAPI spec with api.swagger.yaml (together-shaping) for the RL save/resume training checkpoint feature.

Changes

Session create (Start)

• RL.StartTrainingSessionRequest: Replaced checkpoint_id with resume_from_checkpoint_id (optional string) so the spec matches the backend. Description: "Checkpoint ID to resume from."

Session response

• RL.TrainingSession: Added:
  • training_checkpoints: Array of RL.TrainingCheckpoint (list of saved training checkpoints for the session).
  • resume_from_checkpoint_id: Optional string (checkpoint this session was resumed from).

New endpoints

• POST /rl/training-sessions/{session_id}/operations/training-checkpoint
  • createTrainingCheckpoint: Submits a save-training-checkpoint operation (adapter + optimizer + step to object storage). Returns RL.TrainingCheckpointOperation.
• GET /rl/training-sessions/{session_id}/operations/training-checkpoint/{operation_id}
  • getTrainingCheckpointOperation: Returns status and result of a save-training-checkpoint operation.

New schemas

• RL.TrainingCheckpoint: id, step, created_at (saved training checkpoint item).
• RL.TrainingCheckpointResult: checkpoint_id (used for resume via Start).
• RL.TrainingCheckpointOperation: id, status, output, error (same shape as inference checkpoint operation).

[github-actions]

✱ Stainless preview builds

This PR will update the togetherai SDKs with the following commit messages.

go

chore(internal): regenerate SDK with no functional changes

openapi

feat(api): add training checkpoint operations/models to RL, update session types

python

chore(internal): regenerate SDK with no functional changes

terraform

chore(internal): regenerate SDK with no functional changes

typescript

chore(internal): regenerate SDK with no functional changes

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Last updated: 2026-03-17 21:31:40 UTC