ide/features.md Codex Docs, 2026-02-24 00:33 UTC → 2026-04-08 18:32 UTC

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21## Adjust reasoning effort21## Adjust reasoning effort

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23You can adjust reasoning effort to control how long Codex thinks before responding. Higher effort can help on complex tasks, but responses take longer. Higher effort also uses more tokens and can consume your rate limits faster (especially with GPT-5-Codex).23You can adjust reasoning effort to control how long Codex thinks before responding. Higher effort can help on complex tasks, but responses take longer. Higher effort also uses more tokens and can consume your rate limits faster, especially with higher-capability models.

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25Use the same model switcher shown above, and choose `low`, `medium`, or `high` for each model. Start with `medium`, and only switch to `high` when you need more depth.25Use the same model switcher shown above, and choose `low`, `medium`, or `high` for each model. Start with `medium`, and only switch to `high` when you need more depth.

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58## Web search58## Web search

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60Codex ships with a first-party web search tool. For local tasks in the Codex IDE Extension, Codex enables web search by default and serves results from a web search cache. The cache is an OpenAI-maintained index of web results, so cached mode returns pre-indexed results instead of fetching live pages. This reduces exposure to prompt injection from arbitrary live content, but you should still treat web results as untrusted. If you configure your sandbox for [full access](https://developers.openai.com/codex/security), web search defaults to live results. See [Config basics](https://developers.openai.com/codex/config-basic) to disable web search or switch to live results that fetch the most recent data.60Codex ships with a first-party web search tool. For local tasks in the Codex IDE Extension, Codex enables web search by default and serves results from a web search cache. The cache is an OpenAI-maintained index of web results, so cached mode returns pre-indexed results instead of fetching live pages. This reduces exposure to prompt injection from arbitrary live content, but you should still treat web results as untrusted. If you configure your sandbox for [full access](https://developers.openai.com/codex/agent-approvals-security), web search defaults to live results. See [Config basics](https://developers.openai.com/codex/config-basic) to disable web search or switch to live results that fetch the most recent data.

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62You'll see `web_search` items in the transcript or `codex exec --json` output whenever Codex looks something up.62You'll see `web_search` items in the transcript or `codex exec --json` output whenever Codex looks something up.

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