OpenAI Says GPT-5.6 Stack Optimizations Cut End-to-End Serving Costs by About 20%

OpenAI Says GPT-5.6 Stack Optimizations Cut End-to-End Serving Costs by About 20%

OpenAI reduced GPT-5.6 end-to-end serving costs by 20% through stack optimizations (routing, speculative decoding, agentic harness, model execution). For production AI teams, this means lower request costs and higher throughput; gains compound from workflow efficiency (context caching, tool ordering, prompt reuse) as much as raw model capability.