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Explore GPT-5.6's latest API features
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Notes on GPT-5.6, which includes some interesting new additions to the API (programmatic tool calling and multi-agent in particular) - plus 18 pelicans for the 6 reasoning levels and 3 new models: https://simonwillison.net/2026/Jul/9/gpt…
The new GPT-5.6 family: Luna, Terra, Sol
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