AgenticMarket
AnthropicProprietary APIReleased: 2026-09-01Claude Fable 5.1
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
ARCHITECTURE & LIMITS
BENCHMARK EVALUATIONS & CODE METRICS
Verified scores from SWE-bench and Artificial Analysis.
Independent coding benchmark evaluating syntax, algorithms, and code completion
Broad multi-domain reasoning, science, and knowledge retrieval
Autonomous multi-step tool use, API calling, and task execution
TOKEN COST CALCULATOR
Estimate production API costs for Claude Fable 5.1.
COMMUNITY ENGINEERING EVALUATIONS
Verified ratings across 4 core software engineering dimensions.
Refactoring accuracy, syntax correctness, and adherence to design patterns.
Zero hallucinations, strict constraint compliance, and negative prompt respect.
Time-to-first-token (TTFT) and throughput tokens per second.
Token pricing economics relative to intelligence quality and output volume.
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RECOMMENDED AGENT SKILLS FOR Claude Fable 5.1
boardroom
/cs:boardroom <brief> — 6-phase multi-role deliberation across the C-suite with Phase 2 isolation, critic pre-screen, and synthesis. Outputs a board memo. Use when a decision spans multiple executive domains — e.g. a pricing change touching finance, positioning, and product, or a raise-vs-cut runway call.
FREQUENTLY ASKED QUESTIONS ABOUT Claude Fable 5.1
What are the input and output token prices for Claude Fable 5.1?+
Claude Fable 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens. Cached input reads cost $0.25 per 1M tokens.
Does Claude Fable 5.1 support tool calling and agent execution?+
Yes, Claude Fable 5.1 natively supports tool calling, parallel function execution, and structured agent workflows.
What is the context window of Claude Fable 5.1?+
Claude Fable 5.1 features an active context window of 1,000,000 tokens with a maximum single-turn output of 128,000 tokens.
What AI Agent Skills work best with Claude Fable 5.1?+
Because Claude Fable 5.1 is optimized for agentic tool calling and multimodal vision and code reasoning, it pairs well with Agent Skills like Boardroom, SEO Audit, and UI/UX Pro Max.