50 pages for /fast.

fast-mode Claude Developer Platform · path build-with-claude/fast-mode choosing-a-model Claude Developer Platform · in the page about-claude/models/choosing-a-model …port [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview), which delivers up to 2.5x higher output speed at premium pricing. * **Cost:** What's your budget f… Or, for the model with the same capabilities and no access approval requirement: Claude Developer Platform · in the page about-claude/models/migration-guide …orts [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview); fast mode is not available on Claude Opus 4.7, where requests with `speed: "fast"` return an error… pricing Claude Developer Platform · in the page about-claude/pricing …ing [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode), in research preview, provides significantly faster output for Claude Opus 5 and Claude Opus 4.8 at premium pricing. F… rate-limits Claude Developer Platform · in the page api/rate-limits …and [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) are not available on Claude Platform on AWS. For details, see [Rate limits and quotas on Claude Platform on AWS](https… Message Batches API Claude Developer Platform · in the page build-with-claude/batch-processing …ed` ([Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode)) | Fast mode tunes synchronous latency, which doesn't apply to asynchronous batch processing.… Request 2 caches its request content (not the response) Claude Developer Platform · in the page build-with-claude/prompt-caching …standard speed](https://platform.claude.com/docs/en/build-with-claude/fast-mode) invalidates system and message caches… api-and-data-retention Claude Developer Platform · in the page manage-claude/api-and-data-retention …| | [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) | `/v1/messages` (with `speed: "fast"`) | <Eligible>Yes</Elig… First request Claude Developer Platform · in the page manage-claude/usage-cost-api …rack [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) usage by grouping and filtering with the `speed` dimension. This is useful for monitoring standard versus fast mode us… agent-setup Claude Developer Platform · in the page managed-agents/agent-setup …with [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode), pass `model` as an object, for example: `{"id": "claude-opus-5", "speed": "fast"}`. See the fast mode page's [support… Opus migration Claude Developer Platform · in the page models/opus-5/migration-guide …orts [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview); fast mode is not available on Claude Opus 4.7, where requests with `speed: "fast"` return an error… overview Claude Developer Platform · in the page models/opus-5/overview …lightning" href="https://platform.claude.com/docs/en/build-with-claude/fast-mode"> Lower-latency Claude Opus 5 on the Claude API (research preview), priced separately. </Card> </CardGroup> ## R… whats-new-opus-5 Claude Developer Platform · in the page models/opus-5/whats-new-opus-5 …ode [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview) is available for Claude Opus 5 on the Claude API only; it is not currently available on Amazon Bedr… overview Claude Developer Platform · in the page release-notes/overview …oved [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) for Claude Opus 4.7. Requests to `claude-opus-4-7` with `speed: "fast"` now return an error; unlike Claude Opus 4.6, t… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …orts `fast_mode_state`, and when something blocks [fast mode](/docs/en/fast-mode), `fast_mode_disabled_reason` carries the reason code alongside it, so you can explain the blocked state instead of re-… Orchestrate teams of Claude Code sessions Claude Code CLI · in the page agent-teams …mate's model and fast mode are fixed when it spawns, so `/model` and `/fast` only change the lead's settings. As of v2.1.199, typing either command while viewing a teammate shows a notice that the cha… Claude Code on Amazon Bedrock Claude Code CLI · in the page amazon-bedrock …ready sets a region # Optional: Override the AWS region for the small/fast model (Bedrock and Mantle). # On Bedrock, has no effect without ANTHROPIC_DEFAULT_HAIKU_MODEL # or the deprecated ANTHROPIC_… Claude Code changelog Claude Code CLI · in the page changelog …nder via the access dialog, like any other app * Changed `/model`, `/fast`, and `/effort` to also run immediately instead of queueing until the turn ends on Bedrock, Vertex, and Foundry and when tel… Claude apps gateway configuration Claude Code CLI · in the page claude-apps-gateway-config …ms), serves for `model`. That includes the higher [fast mode](/docs/en/fast-mode#understand-the-cost-tradeoff) rate, so fast and standard requests meter at the same four rates. * A built-in ID such as… Use Claude Code on the web Claude Code CLI · in the page claude-code-on-the-web …inal behave differently in cloud sessions: * **`/model`, `/effort`, `/fast`, `/color`, and `/rename`**: pass the value as an argument, for example `/model sonnet`, instead of opening the terminal pic… Commands Claude Code CLI · in the page commands …| | `/fast [on\|off]` | Toggle [fast mode](/docs/en/fast-mo… Manage costs effectively Claude Code CLI · in the page costs …, so track your own usage-credit spend, including [fast mode](/docs/en/fast-mode#see-where-fast-mode-spend-appears), under [Add usage credits to your subscription](#add-usage-credits-to-your-subscript… Environment variables Claude Code CLI · in the page env-vars …` | Set to `1` to disable [fast mode](/docs/en/fast-mode)… Speed up responses with fast mode Claude Code CLI · in the page fast-mode …odel up to 2.5x faster at a higher cost per token. Toggle it on with `/fast` when you need speed for interactive work like rapid iteration or live debugging, and toggle it off when cost matters more t… Feature availability Claude Code CLI · in the page feature-availability …ting-options))</td> </tr> <tr> <td>[Fast mode](/docs/en/fast-mode)</td> <td>✓ ([Owner-enabled](/docs/en/fast-mode#enable-fast-mode-for-your-organization) on Team and Enterprise)</… Claude Code on Google Cloud's Agent Platform Claude Code CLI · in the page google-vertex-ai …-------- | | Primary model | `claude-opus-5` | | Small/fast model | `claude-sonnet-4-5@20250929` | Background tasks such as session title generation use the small/fast model, normally… Run Claude Code programmatically Claude Code CLI · in the page headless …uch as `/login`, aren't available in `-p` mode. `/model`, `/effort`, `/fast`, `/color`, and `/rename` accept the value as an argument, for example `/model sonnet`, and `/mcp` with no argument prints a… Interactive mode Claude Code CLI · in the page interactive-mode …| Enable or disable [fast mode](/docs/en/fast-mode)… Connect Claude Code to an LLM gateway Claude Code CLI · in the page llm-gateway-connect …ager or managed distribution. * It suppresses the [fast mode](/docs/en/fast-mode) availability check. Unless a previous check already enabled fast mode on the machine, `/fast` reports that fast mode i… Gateway protocol reference Claude Code CLI · in the page llm-gateway-protocol …`GET /inference-profiles/{profile}` lookups. The [fast mode](/docs/en/fast-mode) availability check never appears in gateway logs: it calls `api.anthropic.com` directly rather than following `ANTHROP… Roll out an LLM gateway for your organization Claude Code CLI · in the page llm-gateway-rollout …| Restores [fast mode](/docs/en/fast-mode) when its availability check, which calls `api.anthropic.com` directly rather than following `ANTHROPIC_BASE_URL`, fail… Claude Code on Microsoft Foundry Claude Code CLI · in the page microsoft-foundry …' ``` Background tasks such as session title generation use the small/fast model, normally a Haiku-class model. On Microsoft Foundry, Claude Code defaults this to the primary model because not every… Model configuration Claude Code CLI · in the page model-config …direct an allowed alias to a model outside the list * **Fast mode**: `/fast` refuses to toggle when it would implicitly switch to an Opus model outside the list, with the message "is not in your organ… Monitoring Claude Code CLI · in the page monitoring-usage …for definitions. * `speed`: Either `"fast"` when [Fast mode](/docs/en/fast-mode) is active, or `"normal"` * `attempt`: Retry attempt number. The first attempt is `1`. * `effort`: [Effort level](/docs… Enterprise network configuration Claude Code CLI · in the page network-config …way-connect#set-the-base-url-and-credential), the [fast mode](/docs/en/fast-mode) availability check still calls `api.anthropic.com` rather than the gateway base URL. The check does honor a configured… How Claude Code uses prompt caching Claude Code CLI · in the page prompt-caching …thout asking. ### Turning on fast mode Enabling [fast mode](/docs/en/fast-mode) adds a request header that is part of the cache key, so the next request reads the entire conversation history with no… Continue local sessions from any device with Remote Control Claude Code CLI · in the page remote-control …ing a browser), `/recap`, `/reload-plugins` * `/model`, `/effort`, `/fast`, `/color`, and `/rename`: pass the value as an argument, for example `/model sonnet` or `/effort high`. From mobile and web… Manage sessions Claude Code CLI · in the page sessions …ary of your first prompt, written by a background request to the small/fast model, normally a Haiku-class model. Accepting a plan replaces it with a title based on the plan. Naming the session replace… Claude Code settings Claude Code CLI · in the page settings …| | `fastMode` | Turn [fast mode](/docs/en/fast-mode) on for sessions where it's available. Toggling with `/fast` writes `true` here in user settings and removes the key wh… Claude Code settings reference Claude Code CLI · in the page settings-reference …| Turn [fast mode](/docs/en/fast-mode) on for sessions where it's available… Customize your status line Claude Code CLI · in the page statusline …| Whether [fast mode](/docs/en/fast-mode) is enabled for the session… Create custom subagents Claude Code CLI · in the page sub-agents …ll run in your main conversation. As of v2.1.199, typing `/model` or `/fast` in that view shows a notice that it changes the main conversation's model or fast mode, not the viewed agent's, instead of… Week 20 · May 11–15, 2026 Claude Code CLI · in the page whats-new/2026-w20 …h preview</span> </div> <p className="digest-feature-lede"><code>/fast</code> now runs on Opus 4.7 by default instead of Opus 4.6. Fast mode is a high-speed Opus configuration: the same model qua… Week 22 · May 25–29, 2026 Claude Code CLI · in the page whats-new/2026-w22 …w on Opus 4.8:</p> ```text title="Claude Code" wrap theme={null} /fast ``` <a className="digest-feature-link" href="/docs/docs/en/fast-mode#understand-the-cost-tradeoff">Fast mode pricing</a… Week 30 · July 20–24, 2026 Claude Code CLI · in the page whats-new/2026-w30 …commands over 10,000 characters</div> <div><a href="/docs/docs/en/fast-mode">Fast mode</a> no longer supports Opus 4.7: <code>/fast</code> now applies to Opus 5 and Opus 4.8</div> <div>Long-r… Build with Agent Skills Model Context Protocol · in the page docs/2024-11-05/develop/build-with-agent-skills …e skill includes scaffolds for Cloudflare Workers and portable Express/FastMCP setups. **[MCP apps](/extensions/apps/overview)** extend a server with interactive widgets rendered in chat, such as sea… Build with Agent Skills Model Context Protocol · in the page docs/2025-03-26/develop/build-with-agent-skills …e skill includes scaffolds for Cloudflare Workers and portable Express/FastMCP setups. **[MCP apps](/extensions/apps/overview)** extend a server with interactive widgets rendered in chat, such as sea… Build with Agent Skills Model Context Protocol · in the page docs/2025-06-18/develop/build-with-agent-skills …e skill includes scaffolds for Cloudflare Workers and portable Express/FastMCP setups. **[MCP apps](/extensions/apps/overview)** extend a server with interactive widgets rendered in chat, such as sea… Build with Agent Skills Model Context Protocol · in the page docs/2025-11-25/develop/build-with-agent-skills …e skill includes scaffolds for Cloudflare Workers and portable Express/FastMCP setups. **[MCP apps](/extensions/apps/overview)** extend a server with interactive widgets rendered in chat, such as sea… Build with Agent Skills Model Context Protocol · in the page docs/2026-07-28/develop/build-with-agent-skills …e skill includes scaffolds for Cloudflare Workers and portable Express/FastMCP setups. **[MCP apps](/extensions/apps/overview)** extend a server with interactive widgets rendered in chat, such as sea…