Integrations: Claude Code, Codex, Cursor and more

One Jantaris key is enough for the AI agent in your editor or terminal to write code with Claude, GPT and Gemini models and also generate video, images and music. This page is the map: each tool gets a one-line setup and a link to the full guide.

There are three ways to connect. Pick the one you need or combine them:

• MCP server (https://jantaris.com/mcp) - the agent gets tools: model list, cost estimate, video and image generation, balance. This is how an agent makes media. Details: MCP server.
• Base URL for chat - the tool talks to models through Jantaris instead of the vendor directly. Claude Code uses the Anthropic format (https://jantaris.com), everything else the OpenAI format (https://jantaris.com/v1).
• AGENTS.md file - a description of the Jantaris API dropped into your repo so any agent knows how to call it. Details: AGENTS.md file.

Step 0: API key

1. Sign up and top up your balance (minimum $10, card payment).
2. Open the dashboard and go to the API keys tab.
3. Enter a name such as claude-code and set a Monthly limit - $10-20 is plenty to start.
4. Click Create key and copy the sk-jt-... key right away. It is shown only once.

Create a separate key for each tool. If something goes wrong you revoke one key and everything else keeps working.

Tool table

A dash means the tool has no such option or I have not verified its setup against the official docs.

A tool that is not in the table

If the app has an "OpenAI-compatible", "custom endpoint" or "base URL" field, enter:

If the app supports remote MCP servers (Streamable HTTP), enter https://jantaris.com/mcp and the header Authorization: Bearer sk-jt-....

Codex and the Responses API

Jantaris supports POST /v1/chat/completions (OpenAI format) and POST /v1/messages (Anthropic format). There is no /v1/responses endpoint. The current Codex CLI only accepts wire_api = "responses" for custom model providers, so you cannot make a Jantaris model the "brain" of Codex. Codex can still use Jantaris over MCP: generate video and images, check prices and ask other models with the chat tool. See Codex CLI with Jantaris.

Check your key in 10 seconds

Before configuring any tool, make sure the key works.

macOS and Linux:

curl https://jantaris.com/v1/balance -H "Authorization: Bearer sk-jt-..."

Windows PowerShell:

Invoke-RestMethod -Uri "https://jantaris.com/v1/balance" -Headers @{ Authorization = "Bearer sk-jt-..." }

A good response contains your balance, e.g. {"balance":"12.40","available":"12.40","currency":"USD",...}. A 401 means a wrong or revoked key.

Common problems