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...
Tested on 27 benchmarks · BenchGecko score 88.2. Top scores: OTIS Mock AIME 2024-2025 (100.0%), Proofbench (100.0%), ARC-AGI (97.5%).
Step 3.5 Flash scores 89.5 (101% as good) at $0.10/1M input · 99% cheaper
Unusual and adversarial machine learning challenges. Tests robustness of reasoning about edge cases in ML systems.
Abstraction and Reasoning Corpus. Tests fluid intelligence through novel visual pattern recognition puzzles. Core measure of general intelligence.
ARC-AGI 2, harder sequel to ARC. More complex abstract reasoning patterns that test generalization ability beyond training data.
Mock AIME (American Invitational Mathematics Exam) problems from OTIS. Tests mathematical competition performance.
- Typemultimodal
- Context1.0M tokens (~500 books)
- ReleasedSep 2026
- LicenseProprietary
- StatusActive
- Cost / Message~$0.070
Frequently Asked Questions
Key facts · as of 2026-10-05
- Claude Fable 5.1 by Anthropic. BenchGecko score 88.2, rank 9 of 312 scored models (normalized average of public benchmark scores).
- List price $10.00 input · $50.00 output per 1M tokens (as of 2026-10-05).
- Sold by 4 providers (as of 2026-10-05): Amazon Bedrock $10.00 in / $50.00 out · Anthropic $10.00 in / $50.00 out · Azure $10.00 in / $50.00 out · Google $10.00 in / $50.00 out. Every provider
- Gecko Tests: Who Are You B (Knows who made it) · Tokenizer Tax E (73% more tokens outside English).
How to cite · data as of 2026-10-05
Claude Fable 5.1 · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-05. https://benchgecko.ai/model/claude-fable-5-1
Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP