Claude Fable 5
Claude Fable 5 is Anthropic's generally available Mythos-class model for long-horizon coding, Claude Code, research, and autonomous agents. Explore Claude Fable 5 Claude Code workflows, Claude Fable 5 free access details, and how Claude Mythos 5 and Mythos 5 fit into the model family.
Official Claude Fable 5 benchmark results
Anthropic reports gains across agentic coding, knowledge work, vision, spatial reasoning, computer use, and tool-driven workflows.
Scores and chart are from Anthropic's June 9, 2026 announcement. The broader benchmark table reports the higher result of Claude Fable 5 and Claude Mythos 5 when their scores are within one to three percentage points. Evaluate the model on your own workflows before production use.
Where Claude Fable 5 fits
Fable 5 is most useful when a task combines difficult reasoning, tool use, large amounts of context, and sustained execution across multiple steps.
Complex Claude Code tasks
Use Claude Fable 5 with Claude Code for large migrations, multi-file implementation, debugging, test creation, and codebase-wide analysis.
Long-running agent workflows
Give agents difficult multi-step goals that require planning, tool use, persistent file-based notes, and repeated validation.
Visual application building
Use its vision capabilities to analyze screenshots, interpret detailed figures, and build or refine interfaces.
Research and knowledge work
Apply Fable 5 to complex analysis, research, legal review, finance, and scientific workflows while respecting its safeguards.
Claude Fable 5 and Mythos 5 use the same underlying model
Anthropic says Claude Fable 5 and Claude Mythos 5 share the same capabilities, specifications, and pricing. The practical difference is access and safety-classifier behavior: Fable 5 is widely released with classifiers, while Mythos 5 is a limited-release model without them.
| Feature | Claude Fable 5 | Claude Mythos 5 |
|---|---|---|
| API model ID | claude-fable-5 | claude-mythos-5 |
| Availability | Generally available through the Claude API and supported cloud platforms. | Limited release to approved Project Glasswing customers. |
| Safety classifiers | Included. Certain flagged requests can be declined or retried with another Claude model such as Opus 4.8. | Not included. It shares Fable 5's capabilities without the Fable-specific safety classifiers. |
| Context and output | 1M-token context window and up to 128K output tokens. | 1M-token context window and up to 128K output tokens. |
| Pricing | $10/M input tokens and $50/M output tokens. | $10/M input tokens and $50/M output tokens. |
| Data retention | Requires 30-day data retention and is not available under zero data retention. | Requires 30-day data retention and is not available under zero data retention. |
| Best for | Most users who need Mythos-level capabilities for long-horizon coding, agents, vision, and knowledge work. | Approved cybersecurity, biology, and other trusted-access work that requires use without Fable's classifiers. |
How Claude Fable 5 handles extended, high-complexity work
Anthropic designed Fable 5 to sustain progress on difficult tasks while adding safeguards that make a Mythos-class model suitable for general availability.
Claude Fable 5 pricing, API access, and availability
Claude Fable 5 is generally available through the Claude API and supported cloud platforms. It is usage-priced rather than a permanently free API model.
Claude API pricing
The official API model ID is claude-fable-5. Anthropic lists pricing at $10 per million input tokens and $50 per million output tokens.
Not a permanently free API model
Anthropic's official developer documentation lists usage-based API pricing for Fable 5. Product-plan access and API billing are separate, so check the current Claude plan and platform terms before use.
Claude Code and agent use
Anthropic recommends running Fable 5 in agent harnesses such as Claude Code for ambitious coding projects and long-running autonomous work.
Claude Fable 5 FAQs
Run Claude Fable 5 for Claude Code and ambitious agent workflows
MyClaw provides hosted agent infrastructure, tools, files, memory, and managed runtime for Claude Fable 5, Claude Mythos 5, and other advanced models.
Run Claude Fable 5 in MyClaw