Claude Mythos 5
According to BenchLM.ai, Claude Mythos 5 ranks #1 out of 123 models on the provisional leaderboard with an overall score of 99/100. It also ranks #1 out of 32 on the verified leaderboard. This places it among the top tier of AI models available in 2026, competing directly with the strongest models from all major 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 19 of 237 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 Agentic (#1), while its weakest is Instruction Following (#16). This performance profile makes it particularly useful for coding agents, browser research, and computer-use workflows.
Ranking Distribution
Category rank across 6 benchmark categories — sorted by best rank
Category Performance
Scores across all benchmark categories (0-100 scale)
Category Breakdown
Agentic
#1Coding
#1Reasoning
Knowledge
Math
Multilingual
#1Multimodal
#2Inst. Following
#16Benchmark Details
Only benchmark rows with an attached exact-source record are shown here. Source-unverified manual rows and generated rows are hidden from model pages.
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See how Claude Mythos 5 stacks up against similar models
Frequently Asked Questions
How does Claude Mythos 5 perform overall in AI benchmarks?
Claude Mythos 5 currently ranks #1 out of 123 models on BenchLM's provisional leaderboard with an overall score of 99. It also ranks #1 out of 32 on the verified leaderboard. It is created by Anthropic and features a 1M+ context window.
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 123 models in coding and programming benchmarks with an average score of 100. 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 #1 out of 123 models in agentic tool use and computer tasks benchmarks with an average score of 100. It is among the top performers in this category.
Is Claude Mythos 5 good for multimodal and grounded tasks?
Claude Mythos 5 ranks #2 out of 123 models in multimodal and grounded tasks benchmarks with an average score of 98.9. It is among the top performers in this category.
Is Claude Mythos 5 good for multilingual tasks?
Claude Mythos 5 ranks #1 out of 123 models in multilingual tasks benchmarks with an average score of 100. It is among the top performers in this category.
Does Claude Mythos 5 have full benchmark coverage on BenchLM?
Not yet. Claude Mythos 5 currently has 19 published benchmark scores out of the 237 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 context window of 1M+, which determines how much text it can process in a single interaction.
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