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The Nito Plugin adds /nito: commands alongside Claude Code’s own model. Manual routing sends Claude Code’s ordinary model requests through the Nito API. Choose the route that matches the session you want.

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Configuration

Claude Code speaks the Anthropic Messages API, and Nito serves it at POST /v1/messages. Four environment variables route the session through Nito.
You can keep the non-secret settings in the env block of ~/.claude/settings.json and supply ANTHROPIC_AUTH_TOKEN from your shell or secret manager. Keep keys out of a project’s .claude/settings.json, which can be committed and shared.
Start a new Claude Code session after changing these settings. The host root in ANTHROPIC_BASE_URL is deliberate: Claude Code appends /v1/messages. A /v1 suffix there produces the wrong path. Choose an anthropic/... ID available to your account from the catalog. Use a :confidential ID only if that exact Claude variant appears in the live catalog.

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Check the route

Ask for a one-sentence reply, then try a small file task that uses Claude Code’s client tools. The first request checks model and key access; the second checks the tool loop. A Nito API key is separate from any Claude Code subscription or login. If you get 401, check the exported ANTHROPIC_AUTH_TOKEN in the process that starts Claude Code. For 404, check the base URL and the exact model ID. A 400 mentioning context_management or experimental beta fields points to CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1 being absent from the launched process.

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What This Route Supports

Nito serves /v1/messages and /v1/messages/count_tokens with text, image, and document blocks, client tools, thinking controls, and Anthropic web-search tool definitions, which map to Nito’s web search. Rejected on this route: other Anthropic server-side tools, context_management, mcp_servers, computer-use tools, and the Chat Completions model feature suffixes. Previous thinking blocks in history are accepted and dropped. Claude Code’s manual provider route is for Claude model IDs; use the Nito Plugin to call other models inside Claude Code.

Anthropic SDK Drop-in

The Messages endpoint from code.

Messages Endpoint

Fields and limits.

Codex

Manual routing through the Responses endpoint.