Model profile
Claude Fable 5
Evidence coverage
33 of 320 tracked benchmarks are published. 11 are verified and 22 provisional. 6 of 8 categories are measured.
- Published / tracked
- 33 / 320
- Verified
- 11
- Provisional
- 22
- Categories with evidence
- 6 / 8
Evidence by category
- Agentic13 benchmarksMixed evidence
- Coding8 benchmarksMixed evidence
- Reasoning2 benchmarksReported
- Knowledge6 benchmarksReported
- Math0 benchmarksNot measured
- Multilingual0 benchmarksNot measured
- Multimodal3 benchmarksMixed evidence
- Inst. Following1 benchmarkReported
Claude Fable 5 ranks #2 out of 200 models on the public leaderboard with an overall score of 83.68/100. It also ranks #2 out of 99 on the verified leaderboard. This places it among the top tier of AI models available in 2026, competing directly with the strongest models from leading AI labs.
Claude Fable 5 is a proprietary model with a 1M+ token context window. It uses explicit chain-of-thought reasoning, which typically improves performance on math and complex reasoning tasks at the cost of higher latency and token usage.
Claude Fable 5 is Anthropic's generally available Mythos-class model. It uses the same underlying model as Claude Mythos 5, with production safeguards for cybersecurity, biology, chemistry, distillation, and frontier-AI-development requests. Some Claude clients route flagged requests to Claude Opus 4.8; the Messages API blocks by default unless fallback is configured.
This profile currently has 33 of 320 tracked benchmarks. BenchLM only exposes non-generated benchmark rows publicly, so missing categories stay blank until a sourced evaluation is available.
Its strongest category is Coding (#2), while its weakest is Knowledge (#22). This performance profile makes it particularly well-suited for software development and code generation tasks.
Peer position
Exact provisional scores and ranks for the closest listed peers. A score can appear before a model clears the evidence threshold for a rank, so equal scores can have different rank states.
Range 76.72–83.93
- Claude Mythos 5AnthropicCompare#183.93Claude Mythos 5 is #1 with a score of 83.93.
- Claude Fable 5Current modelAnthropic#283.68Claude Fable 5 is #2 with a score of 83.68.
- GPT-5.6 SolOpenAICompare#381.96GPT-5.6 Sol is #3 with a score of 81.96.
- Kimi K3Moonshot AICompare#480.96Kimi K3 is #4 with a score of 80.96.
- Claude Opus 4.8AnthropicCompare#578.34Claude Opus 4.8 is #5 with a score of 78.34.
- Muse Spark 1.1MetaCompare#677.44Muse Spark 1.1 is #6 with a score of 77.44.
- Grok 4.5xAICompare#776.72Grok 4.5 is #7 with a score of 76.72.
Category percentile
More
Relative position among models eligible for each sourced category. A higher percentile means a stronger position within that category's ranked cohort; 100 is highest.
- Coding99%Eligible cohort rank #2 of 122Category score 80.6
- Agentic93%Eligible cohort rank #9 of 119Category score 63.9
- Knowledge59%Eligible cohort rank #22 of 52Category score 73.3
Category evidence
Scores and ranks appear only where this model has published benchmark evidence. Categories without displayable source records remain not measured.
| Category | Score | Rank | Percentile | Weight | Benchmarks | Evidence |
|---|---|---|---|---|---|---|
| AgenticRank #9 of 119Percentile 93rdWeight 22%13 benchmarksMixed sources | 63.9 | #9 of 119 | 93rd | 22% | 13 benchmarks | Mixed sources |
| CodingRank #2 of 122Percentile 99thWeight 20%8 benchmarksMixed sources | 80.6 | #2 of 122 | 99th | 20% | 8 benchmarks | Mixed sources |
| ReasoningWeight 17%2 benchmarksReported | Score pending | Not ranked | Not available | 17% | 2 benchmarks | Reported |
| KnowledgeRank #22 of 52Percentile 59thWeight 12%6 benchmarksReported | 73.3 | #22 of 52 | 59th | 12% | 6 benchmarks | Reported |
| MathWeight 5%0 benchmarksNot measured | Not measured | Not ranked | Not available | 5% | 0 benchmarks | Not measured |
| MultilingualWeight 7%0 benchmarksNot measured | Not measured | Not ranked | Not available | 7% | 0 benchmarks | Not measured |
| MultimodalRank Not rankedWeight 12%3 benchmarksMixed sources | 65.2 | Not ranked | Not available | 12% | 3 benchmarks | Mixed sources |
| Inst. FollowingRank Not rankedWeight 5%1 benchmarkReported | 80.3 | Not ranked | Not available | 5% | 1 benchmark | Reported |
Chatbot Arena performance
Scroll horizontally to inspect confidence intervals and vote counts.
| View | Elo | Confidence interval | Votes |
|---|---|---|---|
| Text Overall | 1507 | ±7.3 | 8,819 |
| Coding | 1551 | ±12.5 | 2,459 |
| Math | 1552 | ±27.6 | 434 |
| Instruction Following | 1513 | ±11.2 | 3,079 |
| Creative Writing | 1512 | ±15.5 | 1,631 |
| Multi-turn | 1513 | ±16.0 | 1,480 |
| Hard Prompts | 1533 | ±8.5 | 5,873 |
| Hard Prompts (English) | 1530 | ±11.8 | 2,695 |
| Longer Query | 1525 | ±10.3 | 3,936 |
Benchmark Details
Rows below have a displayable published verification record. Each source link and provenance note remains in the page HTML while its category is closed. Source-unverified manual rows and generated rows stay hidden.
Agentic13 benchmarks
Artificial Analysis Agentic Index
τ²-Bench Tool-Agent-User Evaluation
GDPval-AA normalized
Artificial Analysis Briefcase
Artificial Analysis AutomationBench
Artificial Analysis EnterpriseOps-Gym
Artificial Analysis Harvey LAB-AA
Artificial Analysis Tau3-Banking
Coding8 benchmarks
Software Engineering Benchmark Verified
Artificial Analysis Coding Index
Artificial Analysis SciCode
Reasoning2 benchmarks
Artificial Analysis Long Context Reasoning
Critical Physics Tasks
Knowledge6 benchmarks
Artificial Analysis GPQA Diamond
Artificial Analysis Humanity's Last Exam
Artificial Analysis Omniscience Index
Artificial Analysis Omniscience Accuracy
Artificial Analysis Omniscience Hallucination Rate
Multimodal3 benchmarks
Design Arena Website Elo
Inst. Following1 benchmark
Artificial Analysis IFBench
Frequently Asked Questions
How does Claude Fable 5 perform overall in AI benchmarks?
Claude Fable 5 currently ranks #2 out of 200 models on BenchLM's provisional leaderboard with an overall score of 83.68. It also ranks #2 out of 99 on the verified leaderboard. It is created by Anthropic. Its published context window is 1M+.
Is Claude Fable 5 good for knowledge and understanding?
Claude Fable 5 ranks #22 out of 52 models in knowledge and understanding benchmarks with an average score of 73.3. There are stronger options in this category.
Is Claude Fable 5 good for coding and programming?
Claude Fable 5 ranks #2 out of 122 models in coding and programming benchmarks with an average score of 80.6. It is among the top performers in this category.
Is Claude Fable 5 good for reasoning and logic?
Claude Fable 5 has visible benchmark coverage in reasoning and logic, but BenchLM does not currently assign it a global category rank there.
Is Claude Fable 5 good for agentic tool use and computer tasks?
Claude Fable 5 ranks #9 out of 119 models in agentic tool use and computer tasks benchmarks with an average score of 63.9. It is among the top performers in this category.
Is Claude Fable 5 good for multimodal and grounded tasks?
Claude Fable 5 has visible benchmark coverage in multimodal and grounded tasks, but BenchLM does not currently assign it a global category rank there.
Is Claude Fable 5 good for instruction following?
Claude Fable 5 has visible benchmark coverage in instruction following, but BenchLM does not currently assign it a global category rank there.
Does Claude Fable 5 have full benchmark coverage on BenchLM?
Not yet. Claude Fable 5 currently has 33 published benchmark scores out of the 320 benchmarks BenchLM tracks. BenchLM only exposes non-generated public benchmark rows, so missing categories stay blank until a sourced evaluation is available.
What is the context window size of Claude Fable 5?
Claude Fable 5 has a published context window of 1M+, which determines how much text it can process in a single interaction.
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