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Fortytwo tests these agents and apps with the Fortytwo API: chat, streaming and tool calls. Any other tool that lets you add an OpenAI-compatible Chat Completions provider can work too: use its own guide and the settings below. Choose Chat Completions, not the Responses API.
Before you start: create a Fortytwo API key and buy credits — see Quickstart, step 1. Give each agent its own key with a Spend limit.
The model returns its reasoning in the reasoning field. Agents that read only reasoning_content work, but do not show the reasoning.

Something not working with your agent, or using one we have not listed? Tell us in the platform: Feedback for ideas and small bugs, Contact support if it blocks your work, or Report a security issue.
Last modified on October 26, 2026