Docs search: /fast / Claude Code source intelligence

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 …ion? [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) delivers up to 2.5x higher output speed at premium pricing on [supported models](https://platform.claude.com/docs/en/b…

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…

optimizing-for-cost-and-intelligence Claude Developer Platform · in the page about-claude/models/optimizing-for-cost-and-intelligence …n, the [`speed`](https://platform.claude.com/docs/en/build-with-claude/fast-mode) setting, the system prompt, or a tool definition. Changing the output format invalidates the cache for that conversati…

pricing Claude Developer Platform · in the page about-claude/pricing …ing [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) provides significantly faster output for Claude Opus 5.5, Claude Opus 5, and Claude Opus 4.8 at premium pricing. Fast…

Beta Claude Developer Platform · in the page api/beta …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of string`…

Messages Claude Developer Platform · in the page api/beta/messages …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of string`…

Batches Claude Developer Platform · in the page api/beta/messages/batches …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of…

Create a Message Batch Claude Developer Platform · in the page api/beta/messages/batches/create …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of…

Count tokens in a Message Claude Developer Platform · in the page api/beta/messages/count_tokens …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `system: optional string or array of BetaTextB…

Create a Message Claude Developer Platform · in the page api/beta/messages/create …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of string`…

Messages Claude Developer Platform · in the page api/messages …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of string`…

Batches Claude Developer Platform · in the page api/messages/batches …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of…

Create a Message Batch Claude Developer Platform · in the page api/messages/batches/create …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of…

Count tokens in a Message Claude Developer Platform · in the page api/messages/count_tokens …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `system: optional string or array of TextBlock…

Create a Message Claude Developer Platform · in the page api/messages/create …See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models. - `"standard"` - `"fast"` - `stop_sequences: optional array of string`…

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 asynchr…

anthropic-managed Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/anthropic-managed …e:** [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) for Claude Opus 5.5. - **Beta features:** If a beta is limited to selected organizations on the Claude API, the Anthr…

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`<br />with `speed: "fast"` | <Eligible>Y…

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-5-5", "speed": "fast"}`. See the fast mode page's [suppo…

migration-guide Claude Developer Platform · in the page models/opus-5-5/migration-guide …orts [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) on the Claude API. 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-5-5/overview …lightning" href="https://platform.claude.com/docs/en/build-with-claude/fast-mode"> Lower-latency Claude Opus 5.5 on the Claude API, priced separately. </Card> </CardGroup> ## Reference <CardGr…

whats-new-opus-5-5 Claude Developer Platform · in the page models/opus-5-5/whats-new-opus-5-5 …ode [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) is available for Claude Opus 5.5 on the Claude API, on [Claude Models on Google Cloud (Anthropic managed)](https://pla…

overview Claude Developer Platform · in the page release-notes/overview …. - [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) is available for Claude Opus 5.5 on Claude Models on Google Cloud (Anthropic managed). ### October 21, 2026 * We've…

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.md), `fast_mode_disabled_reason` carries the reason code alongside it, so you can explain the blocked state instead of…

Orchestrate teams of Claude Code sessions Claude Code CLI · in the page agent-teams …to confirm before running one of them from this view. * `/model` and `/fast` set the lead's model and fast mode, not the teammate's, so they don't run from this view. A notice tells you why. A teamma…

Manage multiple agents with agent view Claude Code CLI · in the page agent-view …lose agent view * `/logout` signs you out * `/model`, `/effort`, and `/fast` set [what the sessions you dispatch next start with](#set-the-model-effort-and-fast-mode). `/effort` and `/fast` require Cl…

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 …'s hooks would run * Removed the "(research preview)" label from the `/fast` dialog title on Opus 5.5 * \[VSCode] Changed background sub-agents to show as one status line under their Agent card instea…

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.md#understand-the-cost-tradeoff) rate, so fast and standard requests meter at the same four rates. * A built-in ID such…

Use Claude Code in the cloud Claude Code CLI · in the page claude-code-on-the-web …mmand's [availability notes](/docs/en/commands.md#all-commands). * **`/fast`**: toggles [fast mode](/docs/en/fast-mode.md#use-fast-mode-in-cloud-sessions) for the session when fast mode is [available…

Commands Claude Code CLI · in the page commands …| | `/fast [on\|off]` | Toggle [fast mode](/…

Manage costs effectively Claude Code CLI · in the page costs …, so track your own usage-credit spend, including [fast mode](/docs/en/fast-mode.md#see-where-fast-mode-spend-appears), under [Add usage credits to your subscription](#add-usage-credits-to-your-subscr…

Environment variables Claude Code CLI · in the page env-vars …` | Set to `1` to disable [fast mode](/docs/en/fast-mode)…

Error reference Claude Code CLI · in the page errors …ndefinitely. For fast mode requests, see [Handle rate limits](/docs/en/fast-mode.md#handle-rate-limits). On v2.1.199 or later it also raises the default retry count for other transient errors, such as…

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 …d> <td>✓</td> </tr> <tr> <td>[Fast mode](/docs/en/fast-mode.md)</td> <td>✓ ([Owner-enabled](/docs/en/fast-mode.md#enable-fast-mode-for-your-organization) on Team and Enterpr…

Run Claude Code programmatically Claude Code CLI · in the page headless …erface, such as `/login`, aren't available. > * `/model`, `/effort`, `/fast`, `/color`, and `/rename` accept the value as an argument, for example `/model sonnet`, and `/mcp` with no argument prints a…

Hooks reference Claude Code CLI · in the page hooks …ker * The Model setting in `/config` * Turning on [fast mode](/docs/en/fast-mode.md) when that changes the session's model * A `set_model` request, or a model change in an `apply_flag_settings` reques…

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.md) availability check. Unless a previous check already enabled fast mode on the machine, `/fast` reports that fast mod…

Claude Code gateway compatibility guide Claude Code CLI · in the page llm-gateway-protocol …d#the-hipaa-configuration-behind-a-gateway). The [fast mode](/docs/en/fast-mode.md) availability check never appears in gateway logs: it calls `api.anthropic.com` directly rather than following `ANTH…

Roll out an LLM gateway for your organization Claude Code CLI · in the page llm-gateway-rollout …`CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK` | Restores [fast mode](/docs/en/fast-mode.md) when its availability check, which calls `api.anthropic.com` directly rather than following `ANTHROPIC_BASE_URL`, f…

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…