> ## Documentation Index > Fetch the complete documentation index at: https://docs.trajectory.ai/llms.txt > Use this file to discover all available pages before exploring further. # List Training Checkpoints Route > List committed checkpoints in ascending step and checkpoint-ID order. ## OpenAPI ````yaml /openapi.json get /api/v1/train/{run_id}/checkpoints openapi: 3.1.0 info: title: Trajectory API version: 0.1.0 x-trajectory-api-version: '2026-10-14' description: >- This contract is API version 2026-10-14. The optional Trajectory-API-Version header pins it, and tmp-contract is accepted as an alias. Requests without the header get this version. Version 2026-10-07 and the pre-launch legacy response formats are retired. servers: - url: https://api.trajectory.ai security: [] tags: - name: agents x-group: Agents - name: benchmarks x-group: Specs (benchmarks) - name: diagnostics x-group: Diagnostics - name: benchmark-ingestion x-group: Spec (benchmark) submissions - name: eval x-group: Evaluations - name: training x-group: Training - name: deployments x-group: Deployments - name: model-endpoints x-group: Model endpoints - name: inference x-group: Inference - name: trajectories x-group: Trajectories - name: artifacts x-group: Artifacts - name: telemetry x-group: Telemetry - name: supported-models x-group: Supported models - name: organizations x-group: Organizations - name: secrets x-group: Secrets paths: /api/v1/train/{run_id}/checkpoints: get: tags: - training summary: List Training Checkpoints Route description: List committed checkpoints in ascending step and checkpoint-ID order. operationId: listTrainingCheckpoints parameters: - name: run_id in: path required: true schema: type: string title: Run Id - name: cursor in: query required: false schema: anyOf: - type: string - type: 'null' title: Cursor - name: limit in: query required: false schema: type: integer maximum: 200 minimum: 1 default: 25 title: Limit responses: '200': description: Successful Response content: application/json: schema: $ref: >- #/components/schemas/PaginatedResponse_TrainingCheckpointResponse_ '400': description: >- The cursor is malformed, unsupported, or belongs to a different collection scope. headers: X-Request-ID: $ref: '#/components/headers/RequestId' Trajectory-Should-Retry: $ref: '#/components/headers/TrajectoryShouldRetry' Retry-After: $ref: '#/components/headers/RetryAfter' content: application/json: schema: $ref: '#/components/schemas/InvalidCursorErrorResponse' default: $ref: '#/components/responses/ApiErrorResponse' security: - ApiKeyAuth: [] components: schemas: PaginatedResponse_TrainingCheckpointResponse_: properties: items: items: $ref: '#/components/schemas/TrainingCheckpointResponse' type: array title: Items next_cursor: anyOf: - type: string - type: 'null' title: Next Cursor has_more: type: boolean title: Has More type: object required: - items - has_more title: PaginatedResponse[TrainingCheckpointResponse] InvalidCursorErrorResponse: properties: error: $ref: '#/components/schemas/InvalidCursorErrorBody' type: object required: - error title: InvalidCursorErrorResponse TrainingCheckpointResponse: properties: training_run_id: type: string title: Training Run Id step_index: type: integer title: Step Index description: >- Training step whose committed checkpoint was resolved; step 0 precedes optimizer updates. checkpoint_id: type: string title: Checkpoint Id description: Committed checkpoint id for deploy or checkpoint eval. base_model_slug: type: string title: Base Model Slug description: Base model slug the checkpoint was trained from. created_at: type: string format: date-time title: Created At description: Time the checkpoint was created, in UTC. is_deployable: type: boolean title: Is Deployable description: Whether the checkpoint has saved Tinker weights for serving. default: false type: object required: - training_run_id - step_index - checkpoint_id - base_model_slug - created_at title: TrainingCheckpointResponse InvalidCursorErrorBody: properties: type: type: string const: invalid_request_error title: Type code: type: string const: invalid_cursor title: Code message: type: string title: Message param: anyOf: - type: string - type: 'null' title: Param doc_url: type: string title: Doc Url context: $ref: '#/components/schemas/EmptyErrorContext' type: object required: - type - code - message - doc_url - context title: InvalidCursorErrorBody ApiErrorEnvelope: properties: error: $ref: '#/components/schemas/ApiErrorBody' required: - error title: ApiErrorEnvelope type: object EmptyErrorContext: properties: {} additionalProperties: false type: object title: EmptyErrorContext ApiErrorBody: properties: type: $ref: '#/components/schemas/ErrorType' code: type: string title: Code message: type: string title: Message param: anyOf: - type: string - type: 'null' default: null title: Param doc_url: type: string title: Doc Url context: additionalProperties: true title: Context type: object required: - type - code - message - doc_url - context title: ApiErrorBody type: object ErrorType: enum: - invalid_request_error - authentication_error - permission_error - conflict_error - billing_error - rate_limit_error - dependency_error - api_error title: ErrorType type: string headers: RequestId: schema: type: string TrajectoryShouldRetry: schema: type: boolean RetryAfter: schema: type: string responses: ApiErrorResponse: description: >- Common API error. Possible codes: `authentication_required`, `permission_denied`, `validation_error`, `rate_limited`, `internal_error`, `service_unavailable`. headers: X-Request-ID: $ref: '#/components/headers/RequestId' Trajectory-Should-Retry: $ref: '#/components/headers/TrajectoryShouldRetry' Retry-After: $ref: '#/components/headers/RetryAfter' content: application/json: schema: $ref: '#/components/schemas/ApiErrorEnvelope' securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: Organization API key ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.