Model comparison
Claude Opus 5.5 vs Devstral Medium
Claude Opus 5.5 has enough public results to be ranked (#3); Devstral Medium does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
Mistral AISummary
- They share 1 benchmark with published results for both. Claude Opus 5.5 scores higher in 2 categories and Devstral Medium in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 21.1.
- Devstral Medium is cheaper at $0.40 / $2 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
- Claude Opus 5.5 accepts more context: 1M tokens versus 262K.
- Devstral Medium has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 5.5 | Devstral Medium | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 68.6 | 30.1 |
| Released | 2026-09-22 | 2025-07-10 |
| Weights | Proprietary | Open |
| Context window | 1M | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $4 | $0.40 |
| Output $ / M tokens | $20 | $2 |
| Results tracked | 44 | 2 |
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Category by category
Coding Claude Opus 5.5 leads
Claude Opus 5.5: 71.9 (#3), Devstral Medium: 24.3
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| LMArena WebDev | 1813 | 1076 |
| FrontierCode | 54.6% | — |
| CursorBench | 57.8% | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| LMArena Coding | 1547 | — |
| MirrorCode | 77.4% | — |
| ALE-Bench | 2,147 | — |
Agentic & Tool Use Not comparable
Claude Opus 5.5: 45.3 (#15), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |
| Vending-Bench 2 | 9,235 | — |
Reasoning Claude Opus 5.5 leads
Claude Opus 5.5: 80.2 (#3), Devstral Medium: 21.1
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| ARC-AGI-2 | 93.3% | — |
| Kagi LLM Benchmark | — | 37.7% |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| EBR-Bench | 71.4% | — |
| LMArena Hard Prompts | 1535 | — |
| Mystery Game Puzzles | 71% | — |
| DTBench | 98.9% | — |
| LMCA | 68.2% | — |
| Epoch Capabilities Index | 167.33 | — |
Math Not comparable
Claude Opus 5.5: 91.8 (#3), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | 1506 | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge Not comparable
Claude Opus 5.5: 66.4 (#10), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |
| LMArena Expert | 1547 | — |
Multimodal Not comparable
Claude Opus 5.5: 57.8 (#1), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| LMArena Vision | 1321 | — |
| Blueprint-Bench 2 | 51.2% | — |
| Furniture Assembly | 83.3% | — |
Multilingual Not comparable
Claude Opus 5.5: 59.1 (#2), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| LMArena Non-English | 1507 | — |
| LMArena Chinese | 1588 | — |
| LMArena French | 1514 | — |
| LMArena Russian | 1520 | — |
| LMArena Spanish | 1507 | — |
Instruction Following Not comparable
Claude Opus 5.5: 80.0 (#3), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| LMArena Instruction Following | 1537 | — |
Long Context Not comparable
Claude Opus 5.5: 47.1 (#19), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| LMArena Longer Query | 1532 | — |
Writing & Preference Not comparable
Claude Opus 5.5: 78.2 (#3), Devstral Medium: —
| Benchmark | Claude Opus 5.5 | Devstral Medium |
|---|---|---|
| LMArena Text | 1515 | — |
| LMArena Creative Writing | 1533 | — |
| EQ-Bench Creative Writing | 2050 | — |
| LMArena Multi-Turn | 1499 | — |
Frequently asked questions
Is Claude Opus 5.5 better than Devstral Medium?
Claude Opus 5.5 has enough public results to be ranked (#3); Devstral Medium does not yet, so treat this comparison as directional.
Which is cheaper, Claude Opus 5.5 or Devstral Medium?
Devstral Medium is cheaper. It lists at $0.40 per million input tokens and $2 per million output tokens; Claude Opus 5.5 lists at $4 and $20.
Is Claude Opus 5.5 or Devstral Medium better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 24.3 in the Noometry coding category.
Which has the bigger context window?
Claude Opus 5.5 does, with 1M tokens against 262K.
How many benchmarks do Claude Opus 5.5 and Devstral Medium share?
1 benchmark has published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Devstral Medium has 2.