259 pages for fable.
Titles and paths first, then pages whose text carries it. Each row opens that page as this site last read it.
overview
Claude Developer Platform · in the page
models/sonnet-5-5/overview
…:------------------- | :------------- | :--------------- | | [Claude Fable 5.2](https://platform.claude.com/docs/en/models/fable-5-2/overview) | 1M | 128K | $8 / $40 | Moderate |…
whats-new-sonnet-5-5
Claude Developer Platform · in the page
models/sonnet-5-5/whats-new-sonnet-5-5
…| | From Claude Sonnet 5.5, to Claude Opus 5.5, Claude Fable 5.2, or Claude Mythos 5.2 | Yes, on the Claude API and Claude Models on Google Cloud (Google…
overview
Claude Developer Platform · in the page
models/sonnet-5/overview
…:------------------- | :------------- | :--------------- | | [Claude Fable 5.2](https://platform.claude.com/docs/en/models/fable-5-2/overview) | 1M | 128K | $8 / $40 | Adaptive…
overview
Claude Developer Platform · in the page
release-notes/overview
…` repository. </Tip> ### November 9, 2026 * We’ve launched **Claude Fable 5.2** (`claude-fable-5-2`), built for demanding reasoning and long-horizon agentic work. **Claude Mythos 5.2** (`claude-myth…
claude-haiku-4-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-haiku-4-5
…ble via an API and Claude Platform. The most recent models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'cl…
claude-haiku-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-haiku-5-5
…ble via an API and Claude Platform. The most recent models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'cl…
claude-opus-4-6
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-6
…Claude Platform. The most recent publicly available models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-op…
claude-opus-4-7
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-7
…Claude Platform. The most recent publicly available models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-op…
claude-opus-4-8
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-8
…Claude Platform. The most recent publicly available models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-op…
claude-opus-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-5
…Claude Platform. The most recent publicly available models are Claude Fable 5.1, Claude Opus 5.5, Claude Opus 5 (the currently selected model), Claude Sonnet 5.5, and Claude Haiku 5.5. They use the AP…
claude-opus-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-5-5
…Claude Platform. The most recent publicly available models are Claude Fable 5.1, Claude Opus 5.5 (the currently selected model), Claude Sonnet 5.5, and Claude Haiku 5.5. They use the API model strings…
claude-sonnet-4-6
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-4-6
…Claude Platform. The most recent publicly available models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-op…
claude-sonnet-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-5
…ble via an API and Claude Platform. The most recent models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, Claude Sonnet 5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'clau…
claude-sonnet-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-5-5
…ble via an API and Claude Platform. The most recent models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'cl…
overview
Claude Developer Platform · in the page
release-notes/system-prompts/overview
…ated entries on their pages. <CardGroup cols={3}> <Card id="claude-fable-5-2" title="Claude Fable 5.2" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-fabl…
overview
Claude Developer Platform · in the page
resources/overview
…on for Claude models. --- <CardGroup cols={3}> <Card title="Claude Fable 5.2 and Mythos 5.2 System Card" icon="file" href="https://www.anthropic.com/document/claude-fable-5-2-mythos-5-2-system-card…
handle-streaming-refusals
Claude Developer Platform · in the page
test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
…on a fallback model. featureMetadata: supportedModels: - claude-fable-5-2 - claude-mythos-5-2 - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 -…
Escalate hard decisions with the advisor tool
Claude Code CLI · in the page
advisor
…r, see [Turn the advisor off](#turn-the-advisor-off). On some plans, Fable as the advisor also needs your one-time [consent to bill Fable usage to usage credits](https://code.claude.com/docs/en/model…
Configure your agent
Claude Code CLI · in the page
agent-sdk/configuration
…typescript TypeScript theme={null} const options = { model: "claude-fable-5", fallbackModel: "claude-opus-5,claude-sonnet-5", }; ``` ```python Python theme={null} options = ClaudeAgentOptions(…
Agent SDK reference - Python
Claude Code CLI · in the page
agent-sdk/python
…specialized agent to use "model": "sonnet" | "opus" | "haiku" | "fable" | None, # Model override for this agent "effort": "low" | "medium" | "high" | "xhigh" | "max" | None, # Reasoning eff…
Subagents in the SDK
Claude Code CLI · in the page
agent-sdk/subagents
…ing` | No | Model override for this 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, Clau…
Agent SDK reference - TypeScript
Claude Code CLI · in the page
agent-sdk/typescript
…del` | No | Model override for this 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, Clau…
Claude Code on Amazon Bedrock
Claude Code CLI · in the page
amazon-bedrock
…mplify cost tracking and access control. ## 1M token context window Fable models, Sonnet 5 and later, and Opus 4.7 and later run with the [1M token context window](https://platform.claude.com/docs/e…
Best practices for Claude Code
Claude Code CLI · in the page
best-practices
…t replaces most of what people used to do with prompt wording. Claude Fable 5.2, Opus 5.5, Sonnet 5.5, and Haiku 5.5 default to `medium`, which is plenty for everyday feature work with a clear scope.…
Claude Code changelog
Claude Code CLI · in the page
changelog
…refuses it **2.1.321** November 9, 2026 **Added** * Added Claude Fable 5.2 (`claude-fable-5-2`), now the default Fable model — 1M context, $8/$40 per Mtok with \$0.20/Mtok cache reads * Added `--…
Claude apps gateway for Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry
Claude Code CLI · in the page
claude-apps-gateway
…requires v2.1.198 or later. | | 1M token context window | Available | Fable models, Sonnet 5 and later, and Opus 4.7 and later run with the 1M window by default; see [Extended context](https://code.cl…
Claude apps gateway configuration
Claude Code CLI · in the page
claude-apps-gateway-config
…ives its own origin from `X-Forwarded-*` headers; they are client-spoofable. Boot fails without it. `trusted_proxies` below governs client-IP resolution only. Also required to enable [telemetry](#tele…
Claude Code on Claude Platform on AWS
Claude Code CLI · in the page
claude-platform-on-aws
…es the same model IDs as the direct 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 new…
Scan your codebase for vulnerabilities
Claude Code CLI · in the page
claude-security
…://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5), see the [Claude Security](https://claude.com/product/claude-security) product, available on the Ente…
claude-tag
Claude Code CLI · in the page
claude-tag
…,"feature_enabled":true},"impressionData":false},{"name":"automations-fable","enabled":true,"variant":{"name":"disabled","enabled":false,"feature_enabled":true},"impressionData":false},{"name":"fixed-…
CLI reference
Claude Code CLI · in the page
cli-reference
….claude.com/docs/en/advisor.md) for this session with a model alias, `fable`, `opus`, or `sonnet`, or a full model ID. Takes precedence over the `advisorModel` setting for the session. `fable` require…
Commands
Claude Code CLI · in the page
commands
…ts a second model for guidance at key moments during a task. Accepts `fable`, `opus`, `sonnet`, or a full model ID. `fable` requires [Fable access](/docs/en/advisor#choose-an-advisor-model). Without a…
Communications kit
Claude Code CLI · in the page
communications-kit
…quick questions, formatting, and mechanical edits where speed wins. *Fable* is the most capable model for your hardest, longest-running tasks; it is not the default, so select it with `/model fable`,…
Explore the context window
Claude Code CLI · in the page
context-window
…urs. If you need a larger window rather than a smaller conversation, Fable models, Sonnet 5 and later, Haiku 5.5, Opus 4.6 and later, and Sonnet 4.6 support a 1 million token context window. See [Ext…
Manage costs effectively
Claude Code CLI · in the page
costs
…ou can't turn off thinking on Opus 5.5, Sonnet 5.5, Haiku 5.5, or the Fable models, which always use extended thinking. On models with a [fixed thinking budget](https://code.claude.com/docs/en/model-…
Desktop application
Claude Code CLI · in the page
desktop
…uires Claude Opus 4.6 or later, Sonnet 4.6 or later, Haiku 5.5, or a [Fable model](https://code.claude.com/docs/en/model-config.md#work-with-fable). Organization administrators can turn auto mode off…
Environment variables
Claude Code CLI · in the page
env-vars
…| | `ANTHROPIC_DEFAULT_FABLE_MODEL` | Model ID that the `fable` alias resolves to, and the ID Claude Code recognizes as a Fable m…
Error reference
Claude Code CLI · in the page
errors
…peated-529-overloaded-errors) | | `Opus is experiencing high load` / `Fable is experiencing high load` | [Server errors](#api-error-repeated-529-overloaded-errors) | | `Request timed out` | [Server er…
Speed up responses with fast mode
Claude Code CLI · in the page
fast-mode
# Speed up responses with fast mode > Get faster Opus and Fable responses in Claude Code by toggling fast mode with `/fast`. > [!NOTE] > > Fast mode for Claude Fable 5.2 and Claude Opus 5.5 is avail…
Feature availability
Claude Code CLI · in the page
feature-availability
…and Claude Haiku 4.5 * **Subagents**: when the main conversation runs Fable, the built-in [Explore subagent](https://code.claude.com/docs/en/sub-agents.md#built-in-subagents) runs on Opus with a Claud…
Glossary
Claude Code CLI · in the page
glossary
…reasoning; lower effort is faster and cheaper. Effort is supported on Fable models, on Opus 4.6 and later, on Sonnet 4.6 and later, and on Haiku 5.5. Learn more: [Adjust effort level](https://code.cl…
Claude Code on Google Cloud's Agent Platform
Claude Code CLI · in the page
google-vertex-ai
…mplify cost tracking and access control. ## 1M token context window Fable models, Sonnet 5 and later, and Opus 4.7 and later run with the [1M token context window](https://platform.claude.com/docs/e…
Interactive mode
Claude Code CLI · in the page
interactive-mode
…inking mode. Has no effect on Opus 5.5, Sonnet 5.5, Haiku 5.5, or the Fable models, which always use extended thinking. Works on macOS without configuring Option as Meta | | `Option+O` (macOS) or `Alt…
Connect Claude Code to an LLM gateway
Claude Code CLI · in the page
llm-gateway-connect
…ests for Claude Opus 4.6, Claude Sonnet 4.6, Claude Haiku 5.5, Claude Fable 5, and later models | Upgrade the gateway's upstream. On Opus 4.6 and Sonnet 4.6, `CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING=1`…
Claude Code gateway compatibility guide
Claude Code CLI · in the page
llm-gateway-protocol
…e"}` for Claude Opus 4.6, Claude Sonnet 4.6, Claude Haiku 5.5, Claude Fable 5, and later models, and treats model names it doesn't recognize, such as gateway aliases, as current models that receive th…
Claude Code on Microsoft Foundry
Claude Code CLI · in the page
microsoft-foundry
…oundry, when Claude Code can tell which model your deployment serves, Fable models, Sonnet 5 and later, and Opus 4.7 and later run with the [1M token context window](https://platform.claude.com/docs/e…
Model configuration
Claude Code CLI · in the page
model-config
…f a model alias | | **`best`** | Uses the same model as `opus` | | **`fable`** | Uses the [Fable model for your provider](#fable-alias-resolution) for your hardest and longest-running tasks | | **`son…
Choose a permission mode
Claude Code CLI · in the page
permission-modes
….md), Claude Opus 4.6 or later, Sonnet 4.6 or later, Haiku 5.5, or a [Fable model](https://code.claude.com/docs/en/model-config.md#work-with-fable). On Amazon Bedrock, Google Cloud's Agent Platform, M…
How Claude Code uses prompt caching
Claude Code CLI · in the page
prompt-caching
…PI key or a Claude subscription, the cache stays intact by default on Fable 5.1 and later, Opus 5.5, Sonnet 5.5, and Haiku 5.5. See [Changing effort level](#changing-effort-level) below. > [!TIP] > >…
Continue local sessions from any device with Remote Control
Claude Code CLI · in the page
remote-control
…disable the deadline. Requires Claude Code v2.1.224 or later. * **The Fable usage-credits consent prompt isn't forwarded**: Claude Code shows the mid-session [Fable usage-credits consent prompt](https…