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GPT-5.4

GPT-5.4 is a large language model (LLM) released by OpenAI on March 5, 2026.

Release
GPT-5.4 Thinking and GPT-5.4 Pro were released on March 5, 2026, with neither being available to free-tier users. GPT-5.4 mini and GPT-5.4 nano released on March 17, with GPT-5.4 mini available to free-tier users and GPT-5.4 nano available through the OpenAI API. == Reception ==
Reception
ZDNET praised GPT-5.4 Thinking for its low tendency to hallucinate, and criticized it for sometimes not following user prompts accurately. Vice praised GPT-5.4 Thinking for its improved deep research capabilities, and using less tokens in its responses compared to GPT-5.2 Thinking. The Decoder criticized GPT-5.4 mini and GPT-5.4 nano for being four times more expensive through the OpenAI API than their GPT-5 equivalents. ==References==
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