tutoriel1 millionThe model features a 1 million-token context window and becomes the default in ChatGPT and C…✓ Confirmed · 4 sources

OpenAI unveils GPT-5.5, its first revamped model since GPT-4.5 with a 1M-token context window

OpenAI announced on April 23, 2026, the release of GPT-5.5, its first fully revamped model since GPT-4.5.

Published 19sem4 sources✓ ConfirmedImportantupdated 19sem

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The model features a 1 million-token context window and becomes the default in ChatGPT and Codex.

Its per-token pricing has doubled, reaching $5 and $30 depending on the version.

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Apr 23OpenAI unveils GPT-5.5, its first revamped model since GPT-4.5 with a 1M-token context windowthis article

Auto-synthesis from 4 media sources · identified on April 23, 2026