Claude Mythos Preview vs Claude Opus 4.7
Wins 4 of 4 areas
Coding · Agents · Reasoning · Images and charts
Wins 0 of 4 areas
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Claude Mythos Preview is the stronger all-rounder.
Scores updated · 16 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+22.4points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+13.5points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+7.6points ahead
Where Claude Opus 4.7 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 16 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 13.577.864.3+13.5
- SWE-bench MultilingualClaude Mythos Preview by 6.887.380.5+6.8
- SWE-bench VerifiedClaude Mythos Preview by 6.393.987.6+6.3
AgentsClaude Mythos Preview
- BrowseCompClaude Mythos Preview by 7.686.979.3+7.6
- OSWorld-VerifiedClaude Mythos Preview by 1.679.678+1.6
ReasoningClaude Mythos Preview
- Humanity's Last ExamClaude Mythos Preview by 22.464.742.3+22.4
- GPQA DiamondClaude Mythos Preview by 3.294.691.4+3.2
Images and chartsClaude Mythos Preview
- CharXiv (RQ)Claude Mythos Preview by 2.293.291+2.2
Other results8 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 24.55934.5+24.5
- Terminal-Bench 2.0Claude Mythos Preview by 12.68269.4+12.6
- CyberGymClaude Mythos Preview by 1083.173.1+10
- HLE (with tools)Claude Mythos Preview by 1064.754.7+10
- GraphWalks BFS 256KClaude Mythos Preview by 8.885.776.9+8.8
- GraphWalks — Parents task, 256K-token context subsetClaude Mythos Preview by 6.399.993.6+6.3
- CharXiv Reasoning (With tools)Claude Mythos Preview by 1.592.591+1.5
- MMMLUClaude Mythos Preview by 1.292.791.5+1.2
Questions people ask
Which is better, Claude Mythos Preview or Claude Opus 4.7?
Claude Mythos Preview wins all four areas where both have results: coding, agents, reasoning and images and charts. Claude Opus 4.7 wins none.
Which is better for coding?
Claude Mythos Preview. It wins 3 of the 3 coding tests both models report; Claude Opus 4.7 wins none.
How do you compare the two?
We use the 16 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 8 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.