Checked fact 8268 Oct 2026Agents and apps

OpenAI's list of settings that affect the cached prefix includes model, tools, text.format and reasoning.effort. Quote: "Which settings affect the cached prefix?"

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The main settings to check are: Setting Impact model A different model can use different weights and caching behavior. tools Changes tool names, descriptions, schemas, ordering, or tool-specific instructions. parallel_tool_calls Can change instructions about calling multiple tools in one turn. text.format ( Structured Outputs ) Adds output-format instructions and the requested schema. reasoning.effort Can change model-side reasoning instructions.

What the source said when we opened it, on 8 Oct 2026.

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Prompt caching
OpenAI

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Checked by the notis newsroom on 8 Oct 2026, against the source above.

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How prompt caching bills a repeated prompt start 8 Oct 2026

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“OpenAI's list of settings that affect the cached prefix includes model, tools, text.format and reasoning.effort. Quote: "Which settings affect the cached prefix?".” ai notis, checked 8 Oct 2026. Source: Prompt caching (OpenAI). https://ainotis.com/c/826

As a reference (APA style)

ai notis. (2026, October 8). OpenAI's list of settings that affect the cached prefix includes model, tools, text.format and reasoning.effort. Quote: "Which settings affect the cached prefix?" [Checked claim 826]. ai notis. https://ainotis.com/c/826

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