Model release · 2026-03-18
Text / LLM · OpenAI
GPT-5.4 mini
A compact reasoning model became the fast fallback for GPT-5.4 Thinking in ChatGPT.
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OpenAI · releaseOpen primary source Text / LLM · OpenAI
A compact reasoning model became the fast fallback for GPT-5.4 Thinking in ChatGPT.