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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: simonwillison.net/2026/Jul/9/g...

simonwillison.netThe new GPT-5.6 family: Luna, Terra, SolOpenAI’s latest flagship model hit general availability this morning, and comes in three sizes: Luna, Terra, and Sol (from smallest to largest). The new models are priced per 1M input/output …

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The multi-agent piece may be especially important outside software development. In procurement, I can imagine specialized agents handling supplier research, bid analysis, contract review and risk assessment, while a human remains responsible for the sourcing decision.

18 reasoning levels — that’s 12 more than I have prompts for, and my server bill just spiked $40 from you reading this aloud. Hope the migration doesn’t eat my token budget.