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AI CODING · PRACTICAL SETUP GUIDES

AI coding tools
API setup, without the traps

Official config paths, compatibility checks and troubleshooting for Codex, Claude Code and Cursor. Confirm the protocol before you buy third-party API credit.

⌘ Codex setup →✳ Claude Code setup →◈ Cursor setup →
Important: these are setup notes. They are not a passed Ofox test. Buying Ofox API credit does not give you a Codex, Claude Code or Cursor subscription. Each tool speaks a different API and blocks different features.

Ofox’s partner page says the extra $3 on a referred user’s first top-up is paid by Ofox, not by the affiliate. Source, reviewed 2026-10-29.

GUIDE 01

Codex: model provider config

Codex CLI and the IDE extension read ~/.codex/config.toml. Official docs allow a model provider. The service still has to speak the protocol Codex uses and serve the model you name. Official config docs ↗

  1. Install and update official Codex, and confirm it runs on your machine.
  2. Open ~/.codex/config.toml and read the official docs for model_provider, model_providers and wire_api.
  3. Ask the API provider whether they support the Responses protocol Codex uses, the model id, and the auth scheme. OpenAI Chat Completions alone does not prove compatibility.
  4. Make a small test call. Check tool use, long output and stability before a large top-up.
Status: not verified. This site does not ship an untested Ofox Codex config file. Copying a guessed file is how people get errors. tests/ofox_smoke.py does not launch Codex, and it has not recorded a pass here.
Official config reference ↗ See partner models and prices →
GUIDE 02

Claude Code: LLM gateway

Claude Code calls the Anthropic API. Official docs allow an LLM gateway, and that gateway has to expose a compatible interface. Official gateway docs ↗

  1. Install from the official guide and complete a basic run first.
  2. Ask the provider whether they expose an Anthropic Messages gateway, tool calls, streaming, and which model ids.
  3. If they confirm that, the official variable shape looks like this. Use the values they give you:
Shell · example variables (not a working Ofox config)
export ANTHROPIC_BASE_URL="https://YOUR-COMPATIBLE-GATEWAY"
export ANTHROPIC_AUTH_TOKEN="YOUR_API_KEY"

Do not put an API key in GitHub or on a public page. Auth headers and paths differ by gateway. Follow the provider and the official docs.

Status: not verified. Do not put an OpenAI-only /v1 base URL into ANTHROPIC_BASE_URL. Claude Code is not launched by tests/ofox_smoke.py, and that test has not recorded a pass here.
Official getting started ↗ See the partner API →
GUIDE 03

Cursor: do not point it straight at Ofox

Cursor can store API keys for some providers. That setting does not cover every Cursor feature. Official API keys docs ↗

  1. Open Cursor Settings → Models. The menu moves between versions.
  2. Confirm the provider and model are in the official list, add the key as the page describes, and use Verify.
  3. Check whether a custom base URL is supported. For an aggregator, confirm the current Cursor version against that provider’s own notice.
  4. Test chat and edits you actually use. Tab completion and similar features may still use Cursor’s own service.
Status: Ofox marks this incompatible. Cursor Tab, Background Agent and Auto are not a fit for Ofox. Ofox’s suggestion is to run codex or claude in Cursor’s built-in terminal, after those tools are configured on their own. Those two clients are still unverified on this site. Ofox compatibility note ↗, last updated 2026-10-16.
Cursor’s own help ↗ See model prices →
INTERACTIVE SETUP

API setup helper

Pick a tool and an operating system. The helper shows what to prepare, the official docs, and a copyable checklist. Ofox publishes Codex and Claude Code guides. This site has not verified them with a working key. Ofox marks direct Cursor use as unsuitable.

Preparing steps

Checklist
Official config docs ↗ See Ofox models and prices ↗

Do not type or paste a real API key on this page. The checklist is built in your browser and is not submitted.

TROUBLESHOOTING

When the call fails, check these first

401 Unauthorized?

Check that the key belongs to that API, that you did not copy a space, that the account has credit, and that the auth header matches the tool. Do not paste the key into a public post.

404 or model not found?

Check the path, the protocol and the model id. Codex Responses and a generic OpenAI-compatible chat endpoint are not the same feature. Claude Code needs an Anthropic-compatible gateway.

429 or rate limited?

Check balance, concurrency, token rate and upstream capacity. Slow the client down and retry.

Why didn’t a top-up turn on Cursor Tab or an official subscription?

Third-party model credit is billed apart from Codex, Claude Code and Cursor subscriptions. Some features only run on the official service. Ofox’s Cursor note says Tab, Background Agent and Auto do not follow a custom provider.

READY TO EXPLORE?

Check compatibility, then open an API account

Use the referral link to see live models, prices and the new-user offer. Confirm the tool’s protocol before you pay. The extra $3 on a first top-up, if you qualify, is Ofox’s credit.

See models and the new-user offer →

Compare API prices · Official API vs aggregators