The builder’s guide to GPT‑5.6

• AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

Model selection and Responses API mechanics are the levers that decide what an agent costs to run, and this is the vendor's own account of them.

• postWhat are startups learning from building cost-effective agents with GPT-5.6? We OpenAIDevs
• articleGPT-5Ethan Mollick
• articleGPT-5.6 goes GA with an "ultra" parallel-agent setting and sharp cost claimsSam Altman

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