Model profile
Claude Mythos 5
Evidence coverage
15 of 369 tracked benchmarks are published. 15 are verified and 0 provisional. 6 of 8 categories are measured.
- Published / tracked
- 15 / 369
- Verified
- 15
- Provisional
- 0
- Categories with evidence
- 6 / 8
Evidence by category
- Agentic4 benchmarksVerified
- Coding3 benchmarksVerified
- Reasoning0 benchmarksNot measured
- Knowledge3 benchmarksVerified
- Math1 benchmarkVerified
- Multilingual1 benchmarkVerified
- Multimodal3 benchmarksVerified
- Inst. Following0 benchmarksNot measured
Claude Mythos 5 ranks #2 out of 215 models on the public leaderboard with an overall score of 83.01/100. It also ranks #1 out of 101 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 Mythos 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 Mythos 5 is restricted to Glasswing partners and trusted-access programs. Claude Fable 5 is the same underlying model made generally available with additional safeguards for cybersecurity, biology, chemistry, distillation, and frontier-AI-development requests.
This profile currently has 15 of 369 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 (#1), while its weakest is Agentic (#7). 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 76.6–85.88
- Claude Opus 5AnthropicCompare#185.88Claude Opus 5 is #1 with a score of 85.88.
- Claude Mythos 5Current modelAnthropic#283.01Claude Mythos 5 is #2 with a score of 83.01.
- Claude Fable 5AnthropicCompare#382.76Claude Fable 5 is #3 with a score of 82.76.
- GPT-5.6 SolOpenAICompare#481.46GPT-5.6 Sol is #4 with a score of 81.46.
- Kimi K3Moonshot AICompare#579.98Kimi K3 is #5 with a score of 79.98.
- Claude Opus 4.8AnthropicCompare#677.44Claude Opus 4.8 is #6 with a score of 77.44.
- Muse Spark 1.1MetaCompare#776.6Muse Spark 1.1 is #7 with a score of 76.6.
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.
- Coding100%Eligible cohort rank #1 of 130Category score 79.8
- Agentic95%Eligible cohort rank #7 of 129Category score 66.4
- Multilingual0%Eligible cohort rank #13 of 13Category score 0.0
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 #7 of 129Percentile 95thWeight 22%4 benchmarksVerified | 66.4 | #7 of 129 | 95th | 22% | 4 benchmarks | Verified |
| CodingRank #1 of 130Percentile 100thWeight 20%3 benchmarksVerified | 79.8 | #1 of 130 | 100th | 20% | 3 benchmarks | Verified |
| ReasoningWeight 17%0 benchmarksNot measured | Not measured | Not ranked | Not available | 17% | 0 benchmarks | Not measured |
| KnowledgeRank Not rankedWeight 12%3 benchmarksVerified | 93.8 | Not ranked | Not available | 12% | 3 benchmarks | Verified |
| MathRank Not rankedWeight 5%1 benchmarkVerified | 97.6 | Not ranked | Not available | 5% | 1 benchmark | Verified |
| MultilingualRank #13 of 13Percentile 0thWeight 7%1 benchmarkVerified | 0.0 | #13 of 13 | 0th | 7% | 1 benchmark | Verified |
| MultimodalRank Not rankedWeight 12%3 benchmarksVerified | 86.1 | Not ranked | Not available | 12% | 3 benchmarks | Verified |
| Inst. FollowingWeight 5%0 benchmarksNot measured | Not measured | Not ranked | Not available | 5% | 0 benchmarks | Not measured |
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.
Agentic4 benchmarks
Coding3 benchmarks
Software Engineering Benchmark Verified
Knowledge3 benchmarks
Humanity's Last Exam
Graduate-Level Google-Proof Q&A
Humanity's Last Exam without tools
Math1 benchmark
United States of America Mathematical Olympiad 2026
Multilingual1 benchmark
SWE-bench Multilingual
Multimodal3 benchmarks
CharXiv Reasoning
CharXiv Reasoning without tools
Frequently Asked Questions
How does Claude Mythos 5 perform overall in AI benchmarks?
Claude Mythos 5 currently ranks #2 out of 215 models on BenchLM's provisional leaderboard with an overall score of 83.01. It also ranks #1 out of 101 on the verified leaderboard. It is created by Anthropic. Its published context window is 1M+.
Is Claude Mythos 5 good for knowledge and understanding?
Claude Mythos 5 has visible benchmark coverage in knowledge and understanding, but BenchLM does not currently assign it a global category rank there.
Is Claude Mythos 5 good for coding and programming?
Claude Mythos 5 ranks #1 out of 130 models in coding and programming benchmarks with an average score of 79.8. It is among the top performers in this category.
Is Claude Mythos 5 good for mathematics?
Claude Mythos 5 has visible benchmark coverage in mathematics, but BenchLM does not currently assign it a global category rank there.
Is Claude Mythos 5 good for agentic tool use and computer tasks?
Claude Mythos 5 ranks #7 out of 129 models in agentic tool use and computer tasks benchmarks with an average score of 66.4. It is among the top performers in this category.
Is Claude Mythos 5 good for multimodal and grounded tasks?
Claude Mythos 5 has visible benchmark coverage in multimodal and grounded tasks, but BenchLM does not currently assign it a global category rank there.
Is Claude Mythos 5 good for multilingual tasks?
Claude Mythos 5 ranks #13 out of 13 models in multilingual tasks benchmarks with an average score of 0. There are stronger options in this category.
Does Claude Mythos 5 have full benchmark coverage on BenchLM?
Not yet. Claude Mythos 5 currently has 15 published benchmark scores out of the 369 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 Mythos 5?
Claude Mythos 5 has a published context window of 1M+, which determines how much text it can process in a single interaction.