Claude Mythos Preview vs Qwen3.5-35B-A3B

Pick Claude Mythos Preview if you want the stronger benchmark profile. Qwen3.5-35B-A3B only becomes the better choice if knowledge is the priority or you want the cheaper token bill.

Claude Mythos Preview is clearly ahead on the aggregate, 84 to 67. 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 80.9 against 47. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 82% to 40.5%. Qwen3.5-35B-A3B does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.

Claude Mythos Preview is also the more expensive model on tokens at $25.00 input / $125.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Qwen3.5-35B-A3B. That is roughly Infinityx on output cost alone. Claude Mythos Preview gives you the larger context window at 1M, compared with 262K for Qwen3.5-35B-A3B.