Simon Willison • 3/6/2026

Introducing GPT‑5.4

OpenAI introduces the GPT-5.4 and GPT-5.4-Pro models, available via API, ChatGPT, and Codex CLI. Key features include an August 2025 knowledge cutoff, a 1 million token context window, and enhanced capabilities for creating and editing spreadsheets, presentations, and documents. It outperforms the GPT-5.3-Codex on coding benchmarks and is priced slightly higher than the GPT-5.2 family.

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#api #large language models #code generation