GPT-5.6 Can Retain Reasoning Context Across Turns
nikunjhanda · x · 2026-07-14
Reports indicate that a quiet but significant update in GPT-5.6 is the ability to retain reasoning context across turns.
The impacts include:
- Better KV cache hit rates, thereby reducing latency and costs.
- Eliminating the need to repeatedly perform reasoning during long tasks.
- In complex environments, follow-up actions can better sustain the previous hidden thinking.
The quote also mentions that many lab APIs discard reasoning from previous turns. While this mechanism offers the benefit of "continuous compression," it can also lead to repeated reasoning and cache misses; the OpenAI Responses API has explicit constraints regarding this.
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