MODEL

GPT-5.5

Release date:: 2026-04-23
Parameters:: Undisclosed
Architecture:: Autoregressive Transformer
Legacy modality:: Multimodal
Openness:: Closed-source

1 English report

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Apr 23, 2026

OpenAI launches GPT-5.5

OpenAI launches GPT-5.5 for agentic coding, knowledge work and scientific research; the model first becomes available in ChatGPT and Codex, enters the API the following day and supports a context window of more than 1 million tokens.

AI-assisted · reviewedImpact 94/100