173 pages for haiku.

overview Claude Developer Platform · in the page models/opus-5/overview …Adaptive | `high` | Jun 2026 | | [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended… Models overview Claude Developer Platform · in the page models/overview …| Claude Haiku 4.5 | | :--------------------------------------------------… overview Claude Developer Platform · in the page models/sonnet-4-5/overview …Extended | — | Jan 2025 | | [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended… overview Claude Developer Platform · in the page models/sonnet-4-6/overview …(extended deprecated) | `high` | Aug 2025 | | [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended… migration-guide Claude Developer Platform · in the page models/sonnet-5-5/migration-guide …4.6, Claude Sonnet 4.5, Claude Sonnet 4, Claude 3.7 Sonnet, or Claude Haiku 4.5: settings that return errors, thinking changes, and a checklist for each starting model." --- This guide lists the code… overview Claude Developer Platform · in the page models/sonnet-5-5/overview …Adaptive | `high` | Jun 2026 | | [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Fastest | Exten… whats-new-sonnet-5-5 Claude Developer Platform · in the page models/sonnet-5-5/whats-new-sonnet-5-5 …5 reads thinking blocks from Claude Sonnet 5, Claude Opus 4.8, Claude Haiku 4.5, and earlier models, but not from Claude Opus 5, Claude Opus 5.5, or any Claude Fable or Claude Mythos model. No other m… overview Claude Developer Platform · in the page models/sonnet-5/overview …Adaptive | `high` | Jan 2026 | | [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended… overview Claude Developer Platform · in the page release-notes/overview …s/en/api/rate-limits) across the Claude API. Claude Sonnet and Claude Haiku rate limits now match Claude Opus at every usage tier, and usage tiers have been consolidated into three: Start, Build, and… claude-fable-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5 …ls are Claude Fable 5, Claude Opus 4.8, Claude Sonnet 4.6, and Claude Haiku 4.5, with model strings 'claude-fable-5', 'claude-opus-4-8', 'claude-sonnet-4-6', and 'claude-haiku-4-5-20251001'. The perso… claude-fable-5-1 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5-1 …dels are Claude Fable 5.1, Claude Opus 5, Claude Sonnet 5, and Claude Haiku 4.5, with model strings 'claude-fable-5-1', 'claude-opus-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'. The person… claude-opus-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-5 …currently consists of Claude Opus 4.5, Claude Sonnet 4.5, and Claude Haiku 4.5. Claude Opus 4.5 is the most advanced and intelligent model. If the person asks, Claude can tell them about the followi… claude-opus-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-6 …ently consists of Claude Opus 4.6, 4.5, Claude Sonnet 4.5, and Claude Haiku 4.5. Claude Opus 4.6 is the most advanced and intelligent model. If the person asks, Claude can tell them about the followi… claude-opus-4-7 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-7 …cent Claude models are Claude Opus 4.7, Claude Sonnet 4.6, and Claude Haiku 4.5, the exact model strings for which are 'claude-opus-4-7', 'claude-sonnet-4-6', and 'claude-haiku-4-5-20251001' respectiv… claude-opus-4-8 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-8 …del), Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 4.6, and Claude Haiku 4.5. They use the API model strings 'claude-opus-4-8', 'claude-opus-4-7', 'claude-opus-4-6', 'claude-sonnet-4-6', and 'claud… claude-opus-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-5 …de Opus 5 (the currently selected model), Claude Sonnet 5, and Claude Haiku 4.5. They use the API model strings 'claude-fable-5', 'claude-opus-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'.… claude-opus-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-5-5 …Opus 5.5 (the currently selected model), Claude Sonnet 5, and Claude Haiku 4.5. They use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001… claude-sonnet-3-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-3-5 …as released in 2024. The Claude 3 family currently consists of Claude Haiku, Claude Opus, and Claude Sonnet 3.5. Claude Sonnet 3.5 is the most intelligent model. Claude Opus 3 excels at writing and co… claude-sonnet-3-7 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-3-7 …aude 3 model family. The Claude 3 family currently consists of Claude Haiku 3.5, Claude Opus 3, Claude Sonnet 3.5, and Claude Sonnet 3.7. Claude Sonnet 3.7 is the most intelligent model. Claude Opus 3… claude-sonnet-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4-5 …urrently consists of **Claude Opus 4.5, Claude Sonnet 4.5, and Claude Haiku 4.5**. Claude Sonnet 4.5 is **a smart, efficient model for everyday use**. If the person asks, Claude can tell them about t… claude-sonnet-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4-6 …cent Claude models are Claude Opus 4.6, Claude Sonnet 4.6, and Claude Haiku 4.5, the exact model strings for which are 'claude-opus-4-6', 'claude-sonnet-4-6', and 'claude-haiku-4-5-20251001' respectiv… claude-sonnet-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5 …e most recent models are Claude Opus 4.8, Claude Sonnet 5, and Claude Haiku 4.5, with model strings 'claude-opus-4-8', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'. Above Opus sits Anthropic's… claude-sonnet-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5-5 …are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 4.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-4-5-20251001'. Above… overview Claude Developer Platform · in the page release-notes/system-prompts/overview …/release-notes/system-prompts/claude-opus-4-5" /> <Card id="claude-haiku-4-5" title="Claude Haiku 4.5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-haik… overview Claude Developer Platform · in the page resources/overview …ed documentation of Claude Opus 4.5. </Card> <Card title="Claude Haiku 4.5 System Card" icon="file" href="https://www.anthropic.com/claude-haiku-4-5-system-card"> Detailed documentation of Cl… mitigate-jailbreaks Claude Developer Platform · in the page test-and-evaluate/strengthen-guardrails/mitigate-jailbreaks …ils: * **Harmlessness screens:** Use a lightweight model like Claude Haiku 4.5 to pre-screen user input before it reaches your main conversation. Use [structured outputs](https://platform.claude.com/… reduce-latency Claude Developer Platform · in the page test-and-evaluate/strengthen-guardrails/reduce-latency …duce Claude's response latency by choosing a faster model like Claude Haiku 4.5, trimming prompt and output tokens, and streaming responses. --- Latency refers to the time it takes for the model to p… Escalate hard decisions with the advisor tool Claude Code CLI · in the page advisor …main model doesn't support the advisor * The requested model, such as Haiku, can't act as an advisor * Your organization's [`availableModels`](/docs/en/model-config#restrict-model-selection) allowlist… Track cost and usage Claude Code CLI · in the page agent-sdk/cost-tracking …s and cost. This is useful when you run multiple models (for example, Haiku for subagents and Opus for the main agent) and want to see where tokens are going. Each entry's `costBasis` says which pric… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …ride for this agent. Accepts an alias such as `"sonnet"`, `"opus"`, `"haiku"`, or `"inherit"`, or a full model ID. When you omit it, Claude Code picks the model in the [subagent model order](/docs/en/… Subagents in the SDK Claude Code CLI · in the page agent-sdk/subagents …is agent. Accepts an alias such as `'fable'`, `'opus'`, `'sonnet'`, `'haiku'`, `'inherit'`, or a full model ID. `'inherit'` uses the main model. When you omit it, Claude Code picks the model in the [s… Track todos Claude Code CLI · in the page agent-sdk/todo-tracking …y on Claude 3.x models, Opus 4 through 4.7, Sonnet 4 through 4.6, and Haiku 4.5. On every other model, including model IDs Claude Code doesn't recognize, they aren't available unless you opt in: *… Scale to many tools with tool search Claude Code CLI · in the page agent-sdk/tool-search …he SDK decides by model generation: * **Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, and later**: tool search is on by default. * **Earlier Agent Platform models**: the SDK loads tool definitions upfront,… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …is agent. Accepts an alias such as `'fable'`, `'opus'`, `'sonnet'`, `'haiku'`, `'inherit'`, or a full model ID. `'inherit'` uses the main model. When you omit it, Claude Code picks the model in the [s… Manage multiple agents with agent view Claude Code CLI · in the page agent-view …## Row summaries The one-line summary in each row is generated by a [Haiku-class model](/docs/en/model-config) so the row can tell you what the session is doing, what it needs, or what it produced wi… Claude Code on Amazon Bedrock Claude Code CLI · in the page amazon-bedrock …ck and Mantle). # On Bedrock, has no effect without ANTHROPIC_DEFAULT_HAIKU_MODEL # or the deprecated ANTHROPIC_SMALL_FAST_MODEL set. export ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION=us-west-2 # Optional… Claude Code changelog Claude Code CLI · in the page changelog …he plain id was refused * Fixed `/model` picker showing a hardcoded Haiku version and price when `ANTHROPIC_DEFAULT_HAIKU_MODEL` pins a different model * Fixed dynamic workflows started during a m… Claude apps gateway configuration Claude Code CLI · in the page claude-apps-gateway-config …availableModels: [claude-opus-4-8, claude-sonnet-4-6, claude-haiku-4-5] ``` A `match: {}` catch-all, conventionally listed last, is treated as a base layer. Every other policy inherits any k… Claude Code on Claude Platform on AWS Claude Code CLI · in the page claude-platform-on-aws …rect Claude API. The default aliases `fable`, `opus`, `sonnet`, and `haiku` resolve to Claude Code's built-in defaults for Claude Platform on AWS, which can lag the newest release. Without `ANTHROPIC… CLI reference Claude Code CLI · in the page cli-reference …| `claude --fallback-model sonnet,haiku` | | `--fork-session` | When res… Communications kit Claude Code CLI · in the page communications-kit …e model to the moment* Using Opus to fix a typo burns compute. Using Haiku for a 12-file refactor is asking for a re-do. Claude Code runs on the same models as the Claude app, and you can switch mid… Manage costs effectively Claude Code CLI · in the page costs …onfig#setting-your-model). For simple subagent tasks, specify `model: haiku` in your [subagent configuration](/docs/en/sub-agents#choose-a-model). ### Reduce MCP server overhead MCP tool definitions… Environment variables Claude Code CLI · in the page env-vars …| | `ANTHROPIC_DEFAULT_HAIKU_MODEL` | Model ID that the `haiku` alias resolves to, also used for [background functionality](/docs… Error reference Claude Code CLI · in the page errors …. Claude Code treats a model family alias, one of `opus`, `sonnet`, `haiku`, or `fable`, as a request for that family rather than for its newest version. On the Anthropic API and on [Claude Platform… Speed up responses with fast mode Claude Code CLI · in the page fast-mode …ted on Opus 5.5, Opus 5, and Opus 4.8. It is not available on Sonnet, Haiku, or other models. Opus 4.7 doesn't support fast mode, so switching to it turns fast mode off. Fast mode for Opus 4.7 was de… Keep Claude working toward a goal Claude Code CLI · in the page goal …nfigured [small fast model](/docs/en/model-config), which defaults to Haiku on the Claude API; on a third-party provider, check your [provider page](/docs/en/third-party-integrations) for the platform… Claude Code on Google Cloud's Agent Platform Claude Code CLI · in the page google-vertex-ai …odels that don't support global endpoints export VERTEX_REGION_CLAUDE_HAIKU_4_5=us-east5 export VERTEX_REGION_CLAUDE_4_6_SONNET=europe-west1 ``` Most model versions have a corresponding `VERTEX_REGIO… Hooks reference Claude Code CLI · in the page hooks …ested model | | `modelsUsed` | array | `["claude-sonnet-4-5", "claude-haiku-4-5"]` | Models used in order, with consecutive repeats collapsed; set only when the model was swapped mid-run. Requires Cla… Interactive mode Claude Code CLI · in the page interactive-mode …on [Claude 3.x models, Opus 4 through 4.7, Sonnet 4 through 4.6, and Haiku 4.5](/docs/en/tools-reference#task-tool-availability). On any other model, including a model ID Claude Code doesn't recogniz… Connect Claude Code to an LLM gateway Claude Code CLI · in the page llm-gateway-connect …OPUS_MODEL`, `ANTHROPIC_DEFAULT_SONNET_MODEL`, and `ANTHROPIC_DEFAULT_HAIKU_MODEL` as in [Pin model versions](/docs/en/google-vertex-ai#5-pin-model-versions). Setting `ANTHROPIC_DEFAULT_HAIKU_MODEL` a…