OpenAI Engineer Details Six Prompt Caching Improvements Cutting Latency and Cost
pvncher · x · 2026-09-29
An OpenAI engineer shared a batch of recent prompt caching improvements shipped by his team:
- Adjusting reasoning effort mid-trajectory
- Better docs
- Dropping the promptcachekey
- Prompt cache diagnostics
- Cache prewarming
- A cache monitoring dashboard
Combined with their earlier push on cross-turn reasoning preservation in GPT-5.6 — where reasoning context is kept across turns — KV cache hit rates improve, cutting latency and cost, reducing repeated reasoning on long-running tasks, and strengthening follow-ups that depend on prior hidden thinking.
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