Model comparison
Claude Mythos 5 vs Mistral Medium 3.5 128B
Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Mythos 5 #1 (Supported); Mistral Medium 3.5 128B unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Mythos 5 and Mistral Medium 3.5 128B share 1 comparable benchmark result. 1 of 8 categories are comparable. 14 results are unique to Claude Mythos 5; 24 to Mistral Medium 3.5 128B.
Updated July 23, 2026- Shared results
- 1
- Claude Mythos 5 only
- 14
- Mistral Medium 3.5 128B only
- 24
- Comparable categories
- 1 / 8
Treat this as a split decision. Claude Mythos 5 makes more sense if coding is the priority or you need the larger 1M+ context window; Mistral Medium 3.5 128B is the better fit if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 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 and Mistral Medium 3.5 128B finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.
Claude Mythos 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $1.50 input / $7.50 output per 1M tokens for Mistral Medium 3.5 128B. That is roughly 6.7x on output cost alone. Claude Mythos 5 gives you the larger context window at 1M+, compared with 256K for Mistral Medium 3.5 128B.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude Mythos 5 | Δ | Mistral Medium 3.5 128B |
|---|---|---|---|
| Coding | Claude Mythos 589.7 | Margin← 12.1 | Mistral Medium 3.5 128B77.6 |
| Agentic | Claude Mythos 587.0 | MarginNo overlap | Mistral Medium 3.5 128BNot measured |
| Knowledge | Claude Mythos 568.5 | MarginNo overlap | Mistral Medium 3.5 128BNot measured |
| Math | Claude Mythos 597.6 | MarginNo overlap | Mistral Medium 3.5 128BNot measured |
| Multimodal | Claude Mythos 593.5 | MarginNo overlap | Mistral Medium 3.5 128BNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 95.5%B 77.6%Winner: Claude Mythos 5Δ 17.9SWE-bench Verified: Claude Mythos 5 scored 95.5%; Mistral Medium 3.5 128B scored 77.6%. Claude Mythos 5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Mythos 5 | Mistral Medium 3.5 128B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Mythos 5$10 input / $50 output | Mistral Medium 3.5 128B$1.5 input / $7.5 output | Mistral Medium 3.5 128B has the lower combined listed price. |
| Generation speedtokens per second | Claude Mythos 5Not available | Mistral Medium 3.5 128BNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Mythos 5Not available | Mistral Medium 3.5 128BNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Mythos 51M+ | Mistral Medium 3.5 128B256K | Claude Mythos 5 lists the larger context window. |
Benchmark Deep Dive
Agentic15 benchmarks
| Benchmark | Claude Mythos 5 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 88% | — | Not comparable |
| OSWorld-VerifiedSource | 85% | — | Not comparable |
| BrowseCompSource | 88% | — | Not comparable |
| ExploitGymSource | 17.5% | — | Not comparable |
| τ³-bench resultsSource | — | 91.4% | Not comparable |
| AA Agentic IndexSource | — | 19.0% | Not comparable |
| τ²-bench resultsSource | — | 94.2% | Not comparable |
| GDPval-AASource | — | 21.4% | Not comparable |
| GDPval-AASource | — | 929 | Not comparable |
| Gert LabsSource | — | 39.10% | Not comparable |
| AA BriefcaseSource | — | 506 | Not comparable |
| AA EnterpriseOps-GymSource | — | 33.7% | Not comparable |
| AA Harvey LABSource | — | 69.1% | Not comparable |
| AA Tau3 BankingSource | — | 14.4% | Not comparable |
| terminalBenchHardSource | — | 33.3% | Not comparable |
CodingClaude Mythos 5 wins5 benchmarks
Reasoning2 benchmarks
Knowledge10 benchmarks
| Benchmark | Claude Mythos 5 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| GPQASource | 94.1% | — | Not comparable |
| HLESource | 64.5% | — | Not comparable |
| HLE w/o toolsSource | 59% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 29.9% | Not comparable |
| AA-GPQA DiamondSource | — | 74.8% | Not comparable |
| AA-HLESource | — | 12.8% | Not comparable |
| AA-Omniscience IndexSource | — | -36.3% | Not comparable |
| AA-Omniscience AccuracySource | — | 25.1% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 82.0% | Not comparable |
| AA Openness IndexSource | — | 33.3% | Not comparable |
Math1 benchmarks
| Benchmark | Claude Mythos 5 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| USAMO 2026Source | 97.6% | — | Not comparable |
Multilingual1 benchmarks
| Benchmark | Claude Mythos 5 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| SWE MultilingualSource | 92.2% | — | Not comparable |
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude Mythos 5 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 68.8% | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude Mythos 5 or Mistral Medium 3.5 128B?
Claude Mythos 5 and Mistral Medium 3.5 128B are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.
Which is better for coding, Claude Mythos 5 or Mistral Medium 3.5 128B?
Claude Mythos 5 has the edge for coding in this comparison, averaging 89.7 versus 77.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
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