Claude Mythos 5 is the stronger all-rounder.
Scores updated · 26 tests both models report · How we compare
Where each one wins
Tests won in each of the three 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.
Agents 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 5 pulls ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+3.4points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+2.3points ahead
Where Claude Fable 5 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 26 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Mythos 5
- Terminal-Bench 2.1Claude Mythos 5 by 3.484.688+3.4
- SWE-bench Verifiedtie9595.5tie
- SWE-bench Multilingualtie86.686.6tie
- SWE-bench Protie8080tie
ReasoningClaude Mythos 5
- Humanity's Last ExamClaude Mythos 5 by 2.355.557.8+2.3
- ARC-AGI-2tie89.289.2tie
- CritPttie28.628.6tie
Other results18 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.
- GDP (Surge AI)Claude Mythos 5 by 57.529.887.3+57.5
- OfficeQA ProClaude Mythos 5 by 9.257.967.1+9.2
- Terminal-Bench-Science 0.1Claude Mythos 5 by 3.321.424.7+3.3
- HealthBench ProfessionalClaude Fable 5 by 2.76663.3+2.7
- Terminal-Bench 4.0Claude Fable 5 by 2.544.542+2.5
- Toolathlon Avg turnsClaude Fable 5 by 2.219.817.6+2.2
- HealthBench Professional (raw)Claude Mythos 5 by 1.468.970.3+1.4
- Toolathlon VerifiedClaude Mythos 5 by 1.477.979.3+1.4
- HealthBench (raw)Claude Mythos 5 by 1.361.262.5+1.3
- Toolathlontie61.761.1tie
- ARC-AGI-1tie98.598.5tie
- GDPval-AA v2tie17231723tie
- HLE (with tools)tie63.863.8tie
- OSWorld 2.0 (partial)tie72.972.9tie
- OSWorld 2.0 (strict)tie36.136.1tie
- Program Benchtie86.386.3tie
- SWE-bench Multimodaltie54.154.1tie
- Toolathlon Pass@∞tie55.655.6tie
Questions people ask
Which is better, Claude Fable 5 or Claude Mythos 5?
Claude Mythos 5 wins two of the three areas where both have results: coding and reasoning. Claude Fable 5 wins none. They are level on agents.
Which is better for coding?
Claude Mythos 5. It wins 1 of the 4 coding tests both models report; Claude Fable 5 wins none, and 3 are ties.
Which is cheaper?
Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Claude Mythos 5 costs $10.00 and $50.00. For a million tokens read plus a million written, they cost about the same.
How do you compare the two?
We use the 26 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 18 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.