Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Fable 5
96
Claude Mythos 5
99
Verified leaderboard positions: Claude Fable 5 #2 · Claude Mythos 5 #1
Pick Claude Mythos 5 if you want the stronger benchmark profile. Claude Fable 5 only becomes the better choice if knowledge is the priority.
Agentic
+1.8 difference
Coding
+0.3 difference
Knowledge
+0.2 difference
Multimodal
+0.3 difference
Claude Fable 5
Claude Mythos 5
$10 / $50
$10 / $50
N/A
N/A
N/A
N/A
1M+
1M+
Pick Claude Mythos 5 if you want the stronger benchmark profile. Claude Fable 5 only becomes the better choice if knowledge is the priority.
Claude Mythos 5 has the cleaner provisional overall profile here, landing at 99 versus 96. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Claude Mythos 5's sharpest advantage is in agentic, where it averages 87 against 85.2. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 84.3% to 88%. Claude Fable 5 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
Claude Mythos 5 is ahead on BenchLM's provisional leaderboard, 99 to 96. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 84.3% and 88%.
Claude Fable 5 has the edge for knowledge tasks in this comparison, averaging 74.8 versus 74.6. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude Mythos 5 has the edge for coding in this comparison, averaging 85.9 versus 85.6. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude Mythos 5 has the edge for agentic tasks in this comparison, averaging 87 versus 85.2. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude Mythos 5 has the edge for multimodal and grounded tasks in this comparison, averaging 92.7 versus 92.4. Inside this category, SWE-bench Multimodal is the benchmark that creates the most daylight between them.
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