OpenAI Ships GPT-5 for Developers with Custom Tools and Three Model Sizes
OpenAI releases GPT-5 to the API in three sizes - gpt-5, gpt-5-mini, and gpt-5-nano - with 74.9% on SWE-bench Verified and 88% on Aider polyglot. The model adds custom tools that accept plaintext instead of JSON, a new verbosity parameter, and beats o3 at frontend development 70% of the time.
· OpenAI
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