Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Mythos Preview
99
Gemini 3.5 Flash
87
Verified leaderboard positions: Claude Mythos Preview #1 · Gemini 3.5 Flash #6
Pick Claude Mythos Preview if you want the stronger benchmark profile. Gemini 3.5 Flash only becomes the better choice if you want the cheaper token bill.
Agentic
+5.2 difference
Coding
+29.3 difference
Knowledge
+16.9 difference
Multimodal
+8.6 difference
Claude Mythos Preview
Gemini 3.5 Flash
$25 / $125
$1.5 / $9
N/A
284.2 t/s
N/A
18.55s
1M
1M
Pick Claude Mythos Preview if you want the stronger benchmark profile. Gemini 3.5 Flash only becomes the better choice if you want the cheaper token bill.
Claude Mythos Preview is clearly ahead on the provisional aggregate, 99 to 87. 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 coding, where it averages 83.8 against 54.5. The single biggest benchmark swing on the page is HLE, 64.7% to 40.2%.
Claude Mythos Preview is also the more expensive model on tokens at $25.00 input / $125.00 output per 1M tokens, versus $1.50 input / $9.00 output per 1M tokens for Gemini 3.5 Flash. That is roughly 13.9x on output cost alone.
Claude Mythos Preview is ahead on BenchLM's provisional leaderboard, 99 to 87. The biggest single separator in this matchup is HLE, where the scores are 64.7% and 40.2%.
Claude Mythos Preview has the edge for knowledge tasks in this comparison, averaging 74.9 versus 58. 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 54.5. 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 77.2. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude Mythos Preview has the edge for multimodal and grounded tasks in this comparison, averaging 92.4 versus 83.8. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.
Free. No spam. Unsubscribe anytime.