OpenAI published technical lessons from startups in production deploying GPT-5.6 models, Responses API primitives, and prompt caching to build cost-effective AI agents.

Key Details

• Showcases production results and benchmark efficiencies from startups including Hex, Hypha, Browser Use, PlayerZero, Rogo, Quadrillion, Obvious, and Ploy
• Details performance and cost optimization of GPT-5.6 Sol, Luna, and Terra across reasoning, document extraction, and browser automation
• Explains architectural primitives in Responses API including retained reasoning, compaction, multi-agent orchestration, and programmatic tool calling
• Highlights prompt caching enhancements with 30-minute minimum TTL and deterministic cache breakpoints

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