Claude Mythos Preview
Claude Mythos Preview is behind the leaders in reasoning and coding. Too few results yet to rate agentic tasks, safety, long context, math, multimodal tasks, multilingual tasks, instruction following, or factuality.
- Price per million tokens
No current price is tracked for this model. See the rate card
- Evidence
25results on23benchmarks
- 25 vendor-reported
From 3 sources · latest Sep 29, 2026 · How verification works
Capability profile
Bars show the model's median result as a share of the leading model's, per capability.
Too few results to rate: AgenticSafetyLong ContextMathMultimodalMultilingualInstruction FollowingFactuality
Claude Mythos Preview benchmark results
25 results on 23 benchmarks, grouped by capability. Every score links to its source; a bar is the result as a share of the capability leader's.
Reasoning
Limited2 of 6 ranked benchmarks measuredFull reasoning ranking- Humanity's Last Exam64.70100%Humanity's Last Exam
- GPQA Diamond94.6098%GPQA
Coding
Limited3 of 10 ranked benchmarks measuredFull coding ranking- SWE-bench Verified93.9098%SWE-Bench Verified
- 87.3093%
- SWE-bench Pro77.8087%SWE-Bench Pro
Agentic
Not enough data0 of 7 ranked benchmarks measuredFull agentic ranking- 79.60—
- BrowseComp86.90—BrowseComp
- 85.40—
Multimodal
Not enough data0 of 6 ranked benchmarks measuredFull multimodal ranking- CharXiv (reasoning)93.20—CharXiv-R
- CharXiv (reasoning)86.20—CharXiv Reasoning (No tools)
More results
- MMMLU92.70—MMMLU
- CyberGym83.10—CyberGym
- 82.00—
- SWE-bench Multimodal59.00—SWE-Bench Multimodal
- 95.50—
- GraphWalks — Parents task, 256K-token context subset99.90—GraphWalks Parents 256K subset
9 more results
- 87.90—
- CharXiv Reasoning (With tools)92.50—CharXiv Reasoning (With tools)
- 74.30—
- GraphWalks BFS 256K85.70—GraphWalks BFS 256K subset
- 61.10—
- HealthBench Professional64.70—HealthBench Professional
- HLE (with tools)64.70—Humanity's Last Exam (With tools)
- Legal Agent Benchmark, Full Public Set13.40—Legal Agent Full Public Benchmark Set
- 43.00—
About this record
Verification: 25 scores · 0 independently verified · 25 vendor-reported. How these tiers are assigned
- Also listed as
- mythos opus previewmythos preview
- Tracked since
- Sep 16, 2026
- Newest source mention
- Sep 16, 2026