# OpenAI — Better prompt caching for GPT-6

- Company: OpenAI (openai.com)
- Announced: 2026-09-22
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://openai.com/index/better-prompt-caching-for-gpt-6
- Record: https://forck.live/items/13119-better-prompt-caching-for-gpt-6
- Subject: GPT / ChatGPT / API
- Models affected: GPT-6
- Pricing: discounts of up to 90% on cached input tokens

OpenAI improved prompt caching for GPT-6 with higher cache hit rates by default within a 30-minute window. The company introduced a Prompt Caching Dashboard to monitor cache performance, a diagnostics tool to identify cache misses, and new controls including explicit cache breakpoints, reasoning effort adjustment without breaking cache, and cache prewarming to help developers reduce latency and costs.

## Evidence

Verbatim from https://openai.com/index/better-prompt-caching-for-gpt-6:

> With the GPT‑6 family, we launched an improved prompt caching system that delivers higher cache hit rates by default. We now give cache discounts for eligible shared prefixes reused within a 30-minute window. We're also introducing new tools to help developers monitor cache performance, diagnose misses, and choose how much of a prompt to cache.

---

Record: https://forck.live/items/13119-better-prompt-caching-for-gpt-6
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md