Claude Fable 5

Claude Fable 5

Quick answer: Claude Fable 5 is a specialised model from Anthropic's Fable line, distinct from the standard Haiku/Sonnet/Opus tiers. It achieves 95% on SWE-bench Verified, 88% on BrowseComp, and 40% on AA Omniscience. As of June 2026, access is suspended under a US government export control directive. Teams requiring similar capabilities should evaluate Claude Opus 4 or Claude Sonnet 4.

Access Status

Important: As of June 2026, access to Claude Fable 5 is suspended under a US government export control directive. See Anthropic's statement for current status. Benchmark data below is preserved for reference.

At a Glance

Where Claude Fable 5 leads

• 95% SWE-bench Verified — among the highest scores on the software engineering benchmark
• 88.0% BrowseComp — strong agentic web research and retrieval
• 84.2% MMMU-Pro — high multimodal understanding performance
• 83.3% MCP Atlas — strong tool-use and API orchestration
• 40% AA Omniscience — leading knowledge retrieval score

Where it lags

• Access currently suspended under US export control directive
• 48.7% Agent's Last Exam — below the top frontier models (GPT-5.6 Sol: 52.7%)
• Pricing not publicly disclosed
• Limited deployment context compared to the standard Claude series

Best for: Reference benchmarking; teams with prior access continuing existing deployments.

What Claude Fable 5 Is

Claude Fable 5 is part of Anthropic's expanded model family beyond the standard Haiku/Sonnet/Opus tiers. Anthropic has developed specialised model lines — including Fable and Mythos — targeting specific capability profiles or deployment contexts that differ from the general-purpose commercial lineup.

Fable 5's benchmark profile positions it as a highly capable model for software engineering and agentic tool-use tasks. Its 95% SWE-bench Verified score is among the highest publicly recorded and suggests particular strength in multi-step code modification and test-driven development workflows. The 88% BrowseComp score similarly indicates strong capability for web-based research and retrieval tasks.

In June 2026, Anthropic issued a statement noting that the US government issued an export control directive suspending access to both Fable 5 and Mythos 5. This limits general availability indefinitely pending resolution of the directive.

Specifications

Pricing

Pricing for Claude Fable 5 is not publicly disclosed. Access is currently suspended — see Anthropic's official statement for current status.

Public Benchmark Scores

Scores from Benchgen evaluations conducted prior to the access suspension. Shown for reference.

Claude Fable 5 vs Alternatives

Claude Fable 5's 95% SWE-bench Verified score is its most notable result — among the highest published. For teams unable to access Fable 5, Claude Opus 4.6 is Anthropic's recommended alternative for high-capability coding and agentic tasks.

Related Models & Benchmarks

• Compare: Claude Opus 4.6 · Claude Sonnet 4.6 · GPT-5.6 Sol
• Benchmarks: SWE-bench Verified · BrowseComp · Agent's Last Exam · MCP Atlas

Frequently Asked Questions

Specs and scores sourced from Anthropic's official communications and Benchgen evaluations; third-party benchmark scores attributed inline. Access status as of June 2026 — verify with Anthropic for current availability. Last updated 2026-07-23.