Models and your access

Connect an account once in the console, under Settings → Accounts: a Claude or ChatGPT subscription, or an Anthropic or OpenAI API key. A run then picks one in this order:

1. Your subscription for that harness.
2. Your API key for that harness.

To pin a run to one specific account, send its id as account_id:

{"harness": "codex", "input": "Upgrade the lockfile and fix what breaks.", "account_id": "<account id>"}

Model calls on your own account are billed by your provider, not by Rush. The run's compute is still metered; see Usage and billing.

"strategy": "platform" runs on Rush's models instead of your accounts, even when you have one connected. Rush covers a one-time model trial per account; once it is used, a run on Rush's models answers 402 TOKEN_LIMIT_REACHED, and connecting your own account is the way to keep running.

A run with no account connected and no strategy uses the same trial, and is refused with a typed 422 once the trial is spent. Pricing lists what each plan includes.

GET /o/{org}/agents/available lists what your org can run: each harness, and under it each model with the fields a run takes.

{"harnesses": [{"name": "claude", "display_name": "Claude Code", "models": [
  {"name": "claude-opus-5-5", "display_name": "Opus 5.5",
   "effort": ["low", "medium", "high", "xhigh", "max"]},
  {"name": "claude-haiku-5-5", "display_name": "Haiku 5.5"}
]}]}

Field on a run	Where its value comes from
harness	A harness name: claude, codex or opencode.
model	A model name listed under that harness. Leave it out for the harness default.
effort	One of that model's effort values. A model with no effort list takes none.

The model name is exactly what that harness's own CLI takes: bare for Claude Code and Codex (claude-opus-5-5, gpt-5.5), provider/model for OpenCode (anthropic/claude-opus-5-5). The list is refreshed as each harness ships, and every model on it is one the sandbox's CLI knows.

Fast mode

A model that runs faster than standard lists speed: ["standard", "fast"]; with no speed list, standard is the only speed. OpenCode has no speed setting: its fast mode is a separate model whose name ends in -fast, which you pick as the model. A session started with an API key does not take speed.

A model that is not listed for the run's harness is refused before any sandbox starts:

{"error": "claude-opus-9 is not a model the claude harness lists.", "code": "MODEL_UNSUPPORTED"}

with status 422. No run is created and nothing is charged. Read /agents/available again and pick a listed name.

Saved agents pin a model too. Theirs is checked when you save the agent and again on every run, so a model that leaves the list stops a saved agent's runs with a typed error instead of running something else.