Claude Mythos 5.1
Claude Mythos 5.1 is behind the leaders in reasoning. Too few results yet to rate coding, agentic tasks, safety, long context, math, multimodal tasks, multilingual tasks, instruction following, or factuality.
Capability profile
Bars show the model's median result as a share of the leading model's, per capability. Select a row to see its results.
Too few results yet to rate Coding, Agentic, Safety, Long Context, Math, Multimodal, Multilingual, Instruction Following or Factuality.
Price
$10.00input$50.00outputper million tokens
From Anthropic's own price page · All prices
Evidence
16results on16benchmarks
- 16 vendor-reported
From 3 sources · latest Oct 16, 2026 · How verification works
Claude Mythos 5.1 benchmark results
16 results on 16 benchmarks, grouped by capability. Each bar is the result as a share of the capability leader's; every result links to its source.
26.8% behind the leader2 of 6 ranked benchmarks measured
- 90.00Sep 1, 2026
- Humanity's Last Exam60.90Sep 1, 2026Humanity's Last Exam (No tools)
0 of 10 ranked benchmarks measured
- 89.10Sep 1, 2026
- 81.20Sep 1, 2026
More results
Benchmarks outside the capability baskets. They are not ranked against a leader.
- Terminal-Bench 4.060.90Oct 16, 2026
- 49.30Sep 1, 2026
- 87.60Sep 1, 2026
- DeepSWE 1.167.40Sep 1, 2026DeepSWE v1.1
- OSWorld 2.0 (strict)41.70Sep 1, 2026
- OSWorld 2.0 (partial)77.90Sep 1, 2026
Show 6 more resultsHide 6 results
- 97.50Sep 1, 2026
- 1853.00Sep 1, 2026
- 62.10Sep 1, 2026
- HLE (with tools)65.00Sep 1, 2026Humanity's Last Exam (With tools)
- 54.70Sep 1, 2026
- Terminal-Bench-Science 0.152.60Sep 1, 2026
Claude Mythos 5.1: common questions
Who makes Claude Mythos 5.1?
Claude Mythos 5.1 is made by Anthropic.
When was Claude Mythos 5.1 released?
Claude Mythos 5.1 was released on Sep 1, 2026, according to Anthropic's own announcement.
What is Claude Mythos 5.1 good at?
Claude Mythos 5.1 is behind the leaders in reasoning. Too few results yet to rate coding, agentic tasks, safety, long context, math, multimodal tasks, multilingual tasks, instruction following, or factuality.
How much does Claude Mythos 5.1 cost?
Claude Mythos 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens, according to Anthropic's own price page. At a mix of three input tokens to one output token, it costs more than 95% of the 329 priced models we track.
How many benchmarks has Claude Mythos 5.1 been tested on?
We track 16 results for Claude Mythos 5.1 on 16 benchmarks from 3 sources. The latest was recorded on Oct 16, 2026.
About this record
Where Claude Mythos 5.1's numbers come from, and every name it appears under.
- Tracked since
- Sep 1, 2026
- Newest source mention
- Sep 2, 2026
Where the results come from
Verification: 16 scores · 0 independently verified · 16 vendor-reported. How these tiers are assigned
From 3 sources on 2 sites. www-cdn.anthropic.com supplies 15 of them. Bars are coloured by trust tier.
- www-cdn.anthropic.com15
- api.llm-stats.com1