🔥OpenAI Developer Experience Lead: Starting with GPT-5.4, Codex has been integrated into the main model, ending the independent iteration of the coding model line


OpenAI Developer Experience Lead Romain Huet revealed on X that starting with GPT-5.4, the Codex model line has merged with the main model into a single system, no longer iterating separately. GPT-5.5 further enhances agentic coding and computer use capabilities on this basis. Developers no longer need to choose between general and coding models; a single model covers conversation, reasoning, and coding.
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