Models & Stacks
GPT 5.5 - 5 Layer Stack
A five-layer stack built around GPT 5.5 that turns the model into a working agent system.
Published April 2026
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GPT-5.5 released April 23, 2026, available in ChatGPT and Codex with the API coming soon. The 5-layer stack pulls it together: Reasoning via the Responses API, Execution through OpenAI Workspace Agents, Code in Codex, Vision with ChatGPT Images 2.0, and a converged super app.
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