Cat Jam is now available in stealth for free on AI Gateway
Source
vercel.com
Author
Zachary Chen
Date
Why it matters
A free reasoning modelA model trained to think — generating extended internal reasoning before answering — trading time and tokens for accuracy on hard problems.Full definition → for coding agents is usable now via AI Gateway in Claude Code, Codex and Cursor. Prompts may be retained, so avoid sensitive code.
Key takeaways · AI-distilled
Cat Jam is free only during the stealth period, and is called with the model name stealth/cat-jam.
It works through the AI SDK, the OpenAI-compatible Chat Completions and Responses APIs, and the Anthropic-compatible Messages API, so existing clients for either format can point at it.
To use it in coding agents, install the latest Vercel CLI, run npx vercel ai-gateway setup, then select stealth/cat-jam inside the AI agentAn AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.Full definition →.
According to the post, responses return the model's reasoning text alongside the answer, and the model is tuned for low-latency inferenceRunning a trained model to get answers — the phase where AI is actually used, as opposed to trained.Full definition →.
Terms in this piece · Glossary
reasoning model — A model trained to think — generating extended internal reasoning before answering — trading time and tokens for accuracy on hard problems.
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
tool use — A model's ability to call external functions — run code, search the web, edit files — instead of only generating text.
inference — Running a trained model to get answers — the phase where AI is actually used, as opposed to trained.
