Model comparison
Claude Mythos 5 vs Qwen3.5 Plus
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Mythos 5 #1 (Supported); Qwen3.5 Plus #138 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Mythos 5 and Qwen3.5 Plus share 0 comparable benchmark results. 1 of 8 categories are comparable. 15 results are unique to Claude Mythos 5; 4 to Qwen3.5 Plus.
Updated July 23, 2026- Shared results
- 0
- Claude Mythos 5 only
- 15
- Qwen3.5 Plus only
- 4
- Comparable categories
- 1 / 8
Pick Claude Mythos 5 if you want the stronger benchmark profile. Qwen3.5 Plus only becomes the better choice if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Mythos 5 is clearly ahead on the BenchAlign aggregate, 83.93 to 47.2. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Mythos 5's sharpest advantage is in mathematics, where it averages 97.6 against 16.3.
Claude Mythos 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $0.40 input / $2.40 output per 1M tokens for Qwen3.5 Plus. That is roughly 20.8x on output cost alone. Claude Mythos 5 gives you the larger context window at 1M+, compared with 1M for Qwen3.5 Plus.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Mythos 5 | Qwen3.5 Plus | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Mythos 5$10 input / $50 output | Qwen3.5 Plus$0.4 input / $2.4 output | Qwen3.5 Plus has the lower combined listed price. |
| Generation speedtokens per second | Claude Mythos 5Not available | Qwen3.5 PlusNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Mythos 5Not available | Qwen3.5 PlusNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Mythos 51M+ | Qwen3.5 Plus1M | Claude Mythos 5 lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding4 benchmarks
Knowledge3 benchmarks
MathClaude Mythos 5 wins3 benchmarks
Multilingual1 benchmarks
| Benchmark | Claude Mythos 5 | Qwen3.5 Plus | Result |
|---|---|---|---|
| SWE MultilingualSource | 92.2% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude Mythos 5 or Qwen3.5 Plus?
Claude Mythos 5 is ahead on BenchLM's BenchAlign leaderboard, 83.93 to 47.2.
Which is better for math, Claude Mythos 5 or Qwen3.5 Plus?
Claude Mythos 5 has the edge for math in this comparison, averaging 97.6 versus 16.3. Qwen3.5 Plus stays close enough that the answer can still flip depending on your workload.
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