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OpenAI's[1][2][3][4][5] developer post is dated August 7, 2025 and says "Today, we're releasing GPT-5 in our API platform" in three sizes, gpt-5, gpt-5-mini and gpt-5-nano; the API changelog lists "August 7, 2025: Released GPT-5 family of models in the API" and both model pages list a gpt-5-mini-2025-08-07 and gpt-5-nano-2025-08-07 snapshot.OpenAI releases GPT-5 mini and GPT-5 nano in the API with GPT-5: 400,000-token context, new minimal reasoning effort, and prices of $0.25 and $0.05 per 1 million input tokens.
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