42 pages for claude-mythos-5.

introducing-claude-fable-5-and-claude-mythos-5 Claude Developer Platform · title models/fable-5/introducing-claude-fable-5-and-claude-mythos-5 model-deprecations Claude Developer Platform · in the page about-claude/model-deprecations …d. To migrate to [Claude Mythos 5](https://anthropic.com/glasswing) (`claude-mythos-5`), see the [migration guide](https://platform.claude.com/docs/en/models/fable-5/migration-guide#migrating-from-cla… choosing-a-model Claude Developer Platform · in the page about-claude/models/choosing-a-model …eneration intelligence for long-running agents. **Claude Mythos 5** (`claude-mythos-5`) is available through [Project Glasswing](https://anthropic.com/glasswing). Both models support a 1M token contex… Or, for the model with the same capabilities and no access approval requirement: Claude Developer Platform · in the page about-claude/models/migration-guide …form.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mythos-5) is Anthropic's most capable widely released model, available on the Claude API, [Amazon Bedrock](https://platform… advisor-tool Claude Developer Platform · in the page agents-and-tools/tool-use/advisor-tool …-------- | | Claude Haiku 4.5 (claude-haiku-4-5) | Claude Mythos 5 (claude-mythos-5) Claude Fable 5 (claude-fable-5) Claude Opus 5 (claude-opus-5) Claude Opus 4.8 (claude-opus-4-8) Claude Opus 4.7 (… browser-use-tool Claude Developer Platform · in the page agents-and-tools/tool-use/browser-use-tool …-data-retention-requirements)) - Supported models: `claude-fable-5`, `claude-mythos-5`, `claude-opus-5`, `claude-sonnet-5`, `claude-opus-4-8` - Platforms: Claude API, Google Cloud; not available on Cl… code-execution-tool Claude Developer Platform · in the page agents-and-tools/tool-use/code-execution-tool …e_execution_20260120`, `code_execution_20260521` | | Claude Mythos 5 (claude-mythos-5) | `code_execution_20250825`, `code_execution_20260120`, `code_execution_20260521` | | Claude Sonnet… computer-use-tool Claude Developer Platform · in the page agents-and-tools/tool-use/computer-use-tool …-data-retention-requirements)) - Supported models: `claude-fable-5`, `claude-mythos-5`, `claude-opus-5`, `claude-sonnet-5`, `claude-opus-4-8` - Platforms: Claude API, Claude Platform on AWS (beta), Am… Process results programmatically Claude Developer Platform · in the page agents-and-tools/tool-use/programmatic-tool-calling …| Claude Fable 5 (claude-fable-5) | | Claude Mythos 5 (claude-mythos-5) | | Claude Opus 5 (claude-opus-5) | | Claude Opus 4.8 (claude-opus-4-8)… tool-search-tool Claude Developer Platform · in the page agents-and-tools/tool-use/tool-search-tool …egex_20251119`, `tool_search_tool_bm25_20251119` | | Claude Mythos 5 (claude-mythos-5) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` | | Claude Opus 5 (claude-opus… Beta Claude Developer Platform · in the page api/beta …nd options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.ant… Messages Claude Developer Platform · in the page api/beta/messages …nd options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.ant… Batches Claude Developer Platform · in the page api/beta/messages/batches …ptions. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://… Create a Message Batch Claude Developer Platform · in the page api/beta/messages/batches/create …ptions. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://… Retrieve Message Batch results Claude Developer Platform · in the page api/beta/messages/batches/results …ptions. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://… Count tokens in a Message Claude Developer Platform · in the page api/beta/messages/count_tokens …nd options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.ant… Create a Message Claude Developer Platform · in the page api/beta/messages/create …nd options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.ant… Completions Claude Developer Platform · in the page api/completions …details and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthropic.com/en/docs/m… Create a Text Completion Claude Developer Platform · in the page api/completions/create …details and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthropic.com/en/docs/m… errors Claude Developer Platform · in the page api/errors …s/en/build-with-claude/thinking#thinking-output-on-claude-fable-5-and-claude-mythos-5). ### Extended thinking not supported Claude 4.7 and later models have removed extended thinking. Sending `think… Messages Claude Developer Platform · in the page api/messages …details and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthropic.com/en/docs/m… Batches Claude Developer Platform · in the page api/messages/batches …ails and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthropic.com/e… Create a Message Batch Claude Developer Platform · in the page api/messages/batches/create …ails and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthropic.com/e… Retrieve Message Batch results Claude Developer Platform · in the page api/messages/batches/results …and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthrop… Count tokens in a Message Claude Developer Platform · in the page api/messages/count_tokens …details and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthropic.com/en/docs/m… Create a Message Claude Developer Platform · in the page api/messages/create …details and options. - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more` The model that will complete your prompt. See [models](https://docs.anthropic.com/en/docs/m… compaction Claude Developer Platform · in the page build-with-claude/compaction …-data-retention-requirements)) - Supported models: `claude-fable-5`, `claude-mythos-5`, `claude-mythos-preview`, `claude-opus-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-sonne… context-windows Claude Developer Platform · in the page build-with-claude/context-windows …ntext window. Claude Fable 5 and Claude Mythos 5 (claude-fable-5 and claude-mythos-5) also have a 1M-token context window. A single request to any model with a 1M-token context window can generate up… effort Claude Developer Platform · in the page build-with-claude/effort …-data-retention-requirements)) - Supported models: `claude-fable-5`, `claude-mythos-5`, `claude-mythos-preview`, `claude-opus-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-sonne… claude-prompting-best-practices Claude Developer Platform · in the page build-with-claude/prompt-engineering/claude-prompting-best-practices …form.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mythos-5). For details on what's new in Claude Sonnet 5, see [What's new in Claude Sonnet 5](https://platform.claude.com/do… prompting-claude-fable-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5 …form.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mythos-5). For techniques that apply across all current Claude models, see [Prompting best practices](https://platform.clau… refusals-and-fallback Claude Developer Platform · in the page build-with-claude/refusals-and-fallback …s/en/build-with-claude/thinking#thinking-output-on-claude-fable-5-and-claude-mythos-5) pass through unchanged: each retry re-sends your original request body, and the only blocks the middleware remove… structured-outputs Claude Developer Platform · in the page build-with-claude/structured-outputs …-data-retention-requirements)) - Supported models: `claude-fable-5`, `claude-mythos-5`, `claude-mythos-preview`, `claude-opus-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-sonne… task-budgets Claude Developer Platform · in the page build-with-claude/task-budgets …rs): `task-budgets-2026-03-13` - Supported models: `claude-fable-5`, `claude-mythos-5`, `claude-opus-5`, `claude-opus-4-8`, `claude-opus-4-7` Task budgets let you tell Claude how many tokens it has f… thinking-steering-and-cost Claude Developer Platform · in the page build-with-claude/thinking-steering-and-cost …s/en/build-with-claude/thinking#thinking-output-on-claude-fable-5-and-claude-mythos-5), see the [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) overview. This page covers ho… token-counting Claude Developer Platform · in the page build-with-claude/token-counting …with your current model and once with `model: "claude-fable-5"` (or `"claude-mythos-5"`), and compare the two `input_tokens` values. <Note> **Billing and migration:** Usage and billing on Claude Fa… Or, for the model with the same capabilities and no access approval requirement: Claude Developer Platform · in the page models/fable-5/migration-guide …form.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mythos-5) is Anthropic's most capable widely released model, available on the Claude API, [Amazon Bedrock](https://platform… overview Claude Developer Platform · in the page models/fable-5/overview …form.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mythos-5) · [Migration guide](https://platform.claude.com/docs/en/models/fable-5/migration-guide) ## Overview Claude Fabl… overview Claude Developer Platform · in the page models/mythos-5/overview …Most capable model for cybersecurity and biology research Model ID: `claude-mythos-5` Context window: 1M tokens · Max output: 128K tokens · Input pricing: $10 / MTok · Output pricing: $50 / MTok [A… overview Claude Developer Platform · in the page release-notes/overview …r most capable widely released model, alongside **Claude Mythos 5** (`claude-mythos-5`) for Project Glasswing participants. Both models support a [1M token context window](https://platform.claude.com/… Scan your codebase for vulnerabilities Claude Code CLI · in the page claude-security …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 Enterprise plan.… Model configuration Claude Code CLI · in the page model-config …claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5) is the most capable model in Claude Code, suited to tasks larger than a single sitting. It sustains long autonomo…