Claude Mythos Preview vs Claude Sonnet 4.6
Wins 4 of 4 areas
Coding · Agents · Reasoning · Images and charts
Wins 0 of 4 areas
—
Claude Mythos Preview is the stronger all-rounder.
Scores updated · 14 tests both models report · How we compare
Where each one wins
Tests won in each of the four areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- CodingWriting and fixing software20Claude Mythos Preview2 of 2 tests
- AgentsCarrying out multi-step tasks on its own20Claude Mythos Preview2 of 2 tests
- ReasoningHard problems that need careful thinking20Claude Mythos Preview2 of 2 tests
- Images and chartsUnderstanding pictures, charts and video10Claude Mythos Preview1 of 1 test
Images and charts rests on a single test.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Mythos Preview pulls ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+31.1points ahead
- Reasoning about charts from research papersCharXiv (RQ)+21.6points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+19.7points ahead
Where Claude Sonnet 4.6 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 14 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Mythos Preview
- SWE-bench ProClaude Mythos Preview by 19.777.858.1+19.7
- SWE-bench VerifiedClaude Mythos Preview by 14.393.979.6+14.3
AgentsClaude Mythos Preview
- BrowseCompClaude Mythos Preview by 12.286.974.7+12.2
- OSWorld-VerifiedClaude Mythos Preview by 7.179.672.5+7.1
ReasoningClaude Mythos Preview
- Humanity's Last ExamClaude Mythos Preview by 31.164.733.6+31.1
- GPQA DiamondClaude Mythos Preview by 7.194.687.5+7.1
Images and chartsClaude Mythos Preview
- CharXiv (RQ)Claude Mythos Preview by 21.693.271.6+21.6
Other results7 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- Terminal-Bench 2.0Claude Mythos Preview by 22.98259.1+22.9
- HealthBench ProfessionalClaude Mythos Preview by 20.564.744.2+20.5
- HLE (with tools)Claude Mythos Preview by 17.964.746.8+17.9
- BrowseComp (single-agent)Claude Mythos Preview by 11.787.976.2+11.7
- CharXiv Reasoning (With tools)Claude Mythos Preview by 7.292.585.3+7.2
- Legal Agent Benchmark, Full Public SetClaude Mythos Preview by 5.413.48+5.4
- MMMLUClaude Mythos Preview by 3.492.789.3+3.4
Questions people ask
Which is better, Claude Mythos Preview or Claude Sonnet 4.6?
Claude Mythos Preview wins all four areas where both have results: coding, agents, reasoning and images and charts. Claude Sonnet 4.6 wins none.
Which is better for coding?
Claude Mythos Preview. It wins 2 of the 2 coding tests both models report; Claude Sonnet 4.6 wins none.
How do you compare the two?
We use the 14 benchmark tests both models have published scores on. The verdict counts the 7 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 7 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.