GPT-5.4 is out now on ChatGPT (where it goes by the name GPT-5.4 Thinking) as well as on the OpenAI API and OpenAI’s coding ...
GPT-5.4 expands the context window to 1 million tokens; the larger limit supports longer coding and research sessions.
This week's second new model from OpenAI is built for more complex tasks than GPT-5.3 Instant.
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