Model comparison
Claude 4.1 Opus Thinking vs Claude Mythos 5
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 4.1 Opus Thinking #184 (Supported); Claude Mythos 5 #1 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 4.1 Opus Thinking and Claude Mythos 5 share 0 comparable benchmark results. 0 of 8 categories are comparable. 9 results are unique to Claude 4.1 Opus Thinking; 15 to Claude Mythos 5.
Updated July 23, 2026- Shared results
- 0
- Claude 4.1 Opus Thinking only
- 9
- Claude Mythos 5 only
- 15
- Comparable categories
- 0 / 8
Benchmark data for Claude 4.1 Opus Thinking and Claude Mythos 5 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Claude Mythos 5 has the larger context window at 1M+, compared with 200K for Claude 4.1 Opus Thinking.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude 4.1 Opus Thinking | Claude Mythos 5 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 4.1 Opus ThinkingNot available | Claude Mythos 5$10 input / $50 output | A complete price comparison is not available. |
| Generation speedtokens per second | Claude 4.1 Opus Thinking29 tok/s | Claude Mythos 5Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 4.1 Opus Thinking15.00 s | Claude Mythos 5Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 4.1 Opus Thinking200K | Claude Mythos 51M+ | Claude Mythos 5 lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding4 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
Math1 benchmarks
| Benchmark | Claude 4.1 Opus Thinking | Claude Mythos 5 | Result |
|---|---|---|---|
| USAMO 2026Source | — | 97.6% | Not comparable |
Multilingual1 benchmarks
| Benchmark | Claude 4.1 Opus Thinking | Claude Mythos 5 | Result |
|---|---|---|---|
| SWE MultilingualSource | — | 92.2% | Not comparable |
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude 4.1 Opus Thinking | Claude Mythos 5 | Result |
|---|---|---|---|
| AA-IFBenchSource | 55.4% | — | Not comparable |
Frequently Asked Questions (3)
Can I compare Claude 4.1 Opus Thinking and Claude Mythos 5 on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Claude 4.1 Opus Thinking and Claude Mythos 5 today?
Claude 4.1 Opus Thinking: Pricing unavailable Claude Mythos 5: $10.00 input / $50.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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