Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Mythos Preview
99
DeepSeek V4 Pro (High)
83
Verified leaderboard positions: Claude Mythos Preview #1 · DeepSeek V4 Pro (High) #6
Pick Claude Mythos Preview if you want the stronger benchmark profile. DeepSeek V4 Pro (High) only becomes the better choice if you want the cheaper token bill.
Agentic
+12.4 difference
Coding
+10.0 difference
Knowledge
+12.3 difference
Claude Mythos Preview
DeepSeek V4 Pro (High)
$25 / $125
$1.74 / $3.48
N/A
N/A
N/A
N/A
1M
1M
Pick Claude Mythos Preview if you want the stronger benchmark profile. DeepSeek V4 Pro (High) only becomes the better choice if you want the cheaper token bill.
Claude Mythos Preview is clearly ahead on the provisional aggregate, 99 to 83. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Mythos Preview's sharpest advantage is in agentic, where it averages 82.4 against 70. The single biggest benchmark swing on the page is HLE, 64.7% to 34.5%.
Claude Mythos Preview is also the more expensive model on tokens at $25.00 input / $125.00 output per 1M tokens, versus $1.74 input / $3.48 output per 1M tokens for DeepSeek V4 Pro (High). That is roughly 35.9x on output cost alone.
Claude Mythos Preview is ahead on BenchLM's provisional leaderboard, 99 to 83. The biggest single separator in this matchup is HLE, where the scores are 64.7% and 34.5%.
Claude Mythos Preview has the edge for knowledge tasks in this comparison, averaging 74.9 versus 62.6. Inside this category, HLE is the benchmark that creates the most daylight between them.
Claude Mythos Preview has the edge for coding in this comparison, averaging 83.8 versus 73.8. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Claude Mythos Preview has the edge for agentic tasks in this comparison, averaging 82.4 versus 70. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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