Speed up responses with fast mode changedfast-mode
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134134When the check fails, `/fast` reports "Fast mode unavailable due to network connectivity issues", and requests run at standard speed, even when your organization has fast mode enabled. A check that succeeded in the past keeps working from its cached result, so a blocked check mostly affects new installations.
135135
136The same connectivity message appears on an open network when the check reaches `api.anthropic.com` but presents a credential Anthropic rejects. A session whose resolved key is a gateway-issued credential, held in [`ANTHROPIC_API_KEY`](/docs/en/llm-gateway-connect#set-the-base-url-and-credential) or produced by an [`apiKeyHelper`](/docs/en/settings#available-settings), sends the check with that key, and the rejected request is reported as a connectivity failure.
136The same connectivity message appears on an open network when the check reaches `api.anthropic.com` but presents a credential Anthropic rejects. A session whose resolved key is a gateway-issued credential, held in [`ANTHROPIC_API_KEY`](/docs/en/llm-gateway-connect#set-the-base-url-and-credential) or produced by an [`apiKeyHelper`](/docs/en/settings-reference#apikeyhelper), sends the check with that key, and the rejected request is reported as a connectivity failure.
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138138To restore fast mode, allowlist direct egress to `api.anthropic.com` where a network block is the cause, or set whichever variable matches how the check fails:
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153153
154154### Require per-session opt-in
155155
156By default, fast mode a user turns on in an interactive session persists across sessions. To change this, set `fastModePerSessionOptIn` to `true` in any [settings file](/docs/en/settings#settings-files), which causes each session to start with fast mode off and requires users to explicitly enable it with `/fast`. Owners on [Team](https://claude.com/pricing?utm_source=claude_code\&utm_medium=docs\&utm_content=fast_mode_teams#team-&-enterprise) or [Enterprise](https://anthropic.com/contact-sales?utm_source=claude_code\&utm_medium=docs\&utm_content=fast_mode_enterprise) plans can deploy it organization-wide through [server-managed settings](/docs/en/server-managed-settings).
156By default, fast mode a user turns on in an interactive session persists across sessions. To change this, set `fastModePerSessionOptIn` to `true` in any [settings file](/docs/en/settings#where-settings-live), which causes each session to start with fast mode off and requires users to explicitly enable it with `/fast`. Owners on [Team](https://claude.com/pricing?utm_source=claude_code\&utm_medium=docs\&utm_content=fast_mode_teams#team-&-enterprise) or [Enterprise](https://anthropic.com/contact-sales?utm_source=claude_code\&utm_medium=docs\&utm_content=fast_mode_enterprise) plans can deploy it organization-wide through [server-managed settings](/docs/en/server-managed-settings).
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158158```json theme={null}
159159{
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