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HomeDocsClaude Code CLI 24 Oct 2026
One change · claude-code

Speed up responses with fast mode changedfast-mode

Upstream edited this page at 24 Oct 2026 23:04 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 24 Oct 2026 23:07 UTC.

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163163 
164164Behind a gateway, check for these configurations, in which Claude Code doesn't send the availability check and has no earlier successful check cached:
165165 
166* You point `ANTHROPIC_BASE_URL` at your gateway and set [`ANTHROPIC_API_KEY`](https://code.claude.com/docs/en/llm-gateway-connect#set-the-base-url-and-credential) to a gateway-issued key that isn't in the format of an Anthropic API key. Claude Code withholds such a key from `api.anthropic.com`.
166* You point `ANTHROPIC_BASE_URL` at your gateway and set [`ANTHROPIC_API_KEY`](https://code.claude.com/docs/en/llm-gateway-connect#set-the-base-url-and-credential) to a gateway-issued key that isn't in the format of an Anthropic API key.
167167* You set [`CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC`](https://code.claude.com/docs/en/env-vars), so Claude Code skips the check.
168168 
169169To restore fast mode in either configuration, set `CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS=1`.
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