Claude Mythos Preview vs Claude Opus 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 · 15 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 software30Claude Mythos Preview3 of 3 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+24.8points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+24.4points ahead
- Reasoning about charts from research papersCharXiv (RQ)+15.8points ahead
Where Claude Opus 4.6 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 15 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 24.477.853.4+24.4
- SWE-bench VerifiedClaude Mythos Preview by 13.193.980.8+13.1
- SWE-bench MultilingualClaude Mythos Preview by 9.587.377.8+9.5
AgentsClaude Mythos Preview
- OSWorld-VerifiedClaude Mythos Preview by 6.979.672.7+6.9
- BrowseCompClaude Mythos Preview by 2.986.984+2.9
ReasoningClaude Mythos Preview
- Humanity's Last ExamClaude Mythos Preview by 24.864.739.9+24.8
- GPQA DiamondClaude Mythos Preview by 594.689.6+5
Images and chartsClaude Mythos Preview
- CharXiv (RQ)Claude Mythos Preview by 15.893.277.4+15.8
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.
- SWE-bench MultimodalClaude Mythos Preview by 31.95927.1+31.9
- Terminal-Bench 2.0Claude Mythos Preview by 16.68265.4+16.6
- HLE (with tools)Claude Mythos Preview by 11.464.753.3+11.4
- CyberGymClaude Mythos Preview by 9.383.173.8+9.3
- CharXiv Reasoning (With tools)Claude Mythos Preview by 7.892.584.7+7.8
- BrowseComp (single-agent)Claude Mythos Preview by 4.287.983.7+4.2
- MMMLUClaude Mythos Preview by 1.692.791.1+1.6
Questions people ask
Which is better, Claude Mythos Preview or Claude Opus 4.6?
Claude Mythos Preview wins all four areas where both have results: coding, agents, reasoning and images and charts. Claude Opus 4.6 wins none.
Which is better for coding?
Claude Mythos Preview. It wins 3 of the 3 coding tests both models report; Claude Opus 4.6 wins none.
How do you compare the two?
We use the 15 benchmark tests both models have published scores on. The verdict counts the 8 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.