Trajectory

Trajectory Training API

The training API from Trajectory — 17 operation(s) for training.

Documentation GitHub OpenAPI

Operations 18

POST /api/v1/train/{run_id}/samples Add Training Samples Route #

POST /api/v1/train Create Training Run Route #

GET /api/v1/train/options Get Training Options Route #

GET /api/v1/train/{bench_id}/runs List Training Runs Route #

GET /api/v1/train/{run_id} Get Training Run Route #

DELETE /api/v1/train/{run_id} Delete Training Run Route #

PATCH /api/v1/train/{training_run_id} Update Training Run Route #

GET /api/v1/train/{run_id}/progress Get Training Progress Route #

GET /api/v1/train/{run_id}/step/trainer-reward-by-step Get Trainer Rewards By Step #

GET /api/v1/train/{run_id}/step/held-out-reward-by-step Get Held Out Rewards By Step #

GET /api/v1/train/{run_id}/step-summaries Get Training Step Summaries #

GET /api/v1/train/{run_id}/steps/{step}/trajectories List Training Step Trajectories #

GET /api/v1/train/{run_id}/steps/{step}/group-stats Get Training Step Group Stats Route #

GET /api/v1/train/{run_id}/steps/{step}/groups List Training Step Groups Route #

GET /api/v1/train/{run_id}/steps/{step}/trajectory-rewards Get Training Trajectory Rewards Route #

POST /api/v1/train/{run_id}/cancel Cancel Training Run Route #

GET /api/v1/train/{run_id}/checkpoints List Training Checkpoints Route #

GET /api/v1/train/{run_id}/checkpoints/{step_index} Get Training Checkpoint Route #

Specifications

https://artifacts.apis.io/trajectory/openapi/trajectory-training-api-openapi.yml

Schemas & Data

https://artifacts.apis.io/trajectory/json-schema/trajectory-experiment-detail-schema.json

https://artifacts.apis.io/trajectory/json-schema/trajectory-eval-run-schema.json

https://artifacts.apis.io/trajectory/json-schema/trajectory-deployment-schema.json

https://artifacts.apis.io/trajectory/json-schema/trajectory-trajectory-schema.json

https://artifacts.apis.io/trajectory/json-schema/trajectory-start-eval-request-schema.json

https://artifacts.apis.io/trajectory/json-schema/trajectory-create-run-request-schema.json

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/trajectory:trajectory-training-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: Trajectory Training 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.
tags:


# --- truncated at 32 KB (73 KB total) ---
# Full source: https://artifacts.apis.io/trajectory/openapi/trajectory-training-api-openapi.yml