Model comparison
Claude Opus 4.5 vs Magistral Small
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 29.9 on the Noometry Index. Magistral Small costs 13× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.
Last verified . 8 shared benchmarks.
Mistral AISummary
- They share 8 benchmarks with published results for both. Claude Opus 4.5 scores higher in 4 categories and Magistral Small in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 4.5 leads 42.5 to 6.9.
- The biggest single-benchmark swing is ARC-AGI-1: 80% for Claude Opus 4.5 and 5% for Magistral Small.
- Magistral Small is cheaper at $0.50 / $1.50 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
- Claude Opus 4.5 accepts more context: 200K tokens versus 128K.
- Magistral Small has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 4.5 | Magistral Small | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 50.5 | 29.9 |
| Released | 2025-11-01 | 2025-06-10 |
| Weights | Proprietary | Open |
| Context window | 200K | 128K |
| Max output | 64K | 40K |
| Input $ / M tokens | $5 | $0.50 |
| Output $ / M tokens | $25 | $1.50 |
| Results tracked | 69 | 10 |
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Category by category
Coding Claude Opus 4.5 leads
Claude Opus 4.5: 55.4 (#21), Magistral Small: 37.8 (#172)
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| SWE-bench Verified | 76.7% | — |
| SWE-bench Verified (bash only) | 76.8% | — |
| LMArena WebDev | 1493 | — |
| SWE-bench Multilingual | 70.7% | — |
| SciCode | — | 35.2% |
| GSO | 26.5% | — |
| WeirdML | 63.7% | — |
| LMArena Coding | 1504 | — |
| ALE-Bench | 1,025 | — |
| AlgoTune | 1.77 | — |
Agentic & Tool Use Not comparable
Claude Opus 4.5: 47.2 (#11), Magistral Small: —
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| Terminal-Bench | 63.1% | — |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Banking | 24.7% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| Cybench | 82% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| BALROG | 43.5% | — |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |
Reasoning Claude Opus 4.5 leads
Claude Opus 4.5: 42.5 (#43), Magistral Small: 6.9 (#345)
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| ARC-AGI-2 | 37.6% | 0% |
| Kagi LLM Benchmark | 80.2% | 6.3% |
| ARC-AGI-1 | 80% | 5% |
| Chess Puzzles | 12% | 3% |
| DTBench | 89.9% | 61.3% |
| Epoch Capabilities Index | 150.1 | 133.19 |
| SimpleBench | 62% | — |
| NYT Connections (extended) | 52.5% | — |
| CritPt | — | 0.3% |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| LMArena Hard Prompts | 1476 | — |
| Mystery Game Puzzles | 22% | — |
| LMCA | 44.5% | — |
| ForecastBench | 60.7 | — |
Math Claude Opus 4.5 leads
Claude Opus 4.5: 38.5 (#85), Magistral Small: 24.9 (#253)
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 86.1% | 30% |
| FrontierMath (Tiers 1-3) | 34.4% | — |
| FrontierMath Tier 4 | 4.9% | — |
| ProofBench | 36% | — |
| LMArena Math | 1463 | — |
| FrontierMath (Feb 2025 set) | 20.7% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Opus 4.5 leads
Claude Opus 4.5: 56.4 (#38), Magistral Small: 30.9 (#215)
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| GPQA Diamond | 86% | 56.1% |
| Humanity's Last Exam | 25.2% | — |
| SimpleQA Verified | 45.7% | — |
| Vectara Hallucination Rate | 10.9% | — |
| LMArena Expert | 1488 | — |
Multimodal Not comparable
Claude Opus 4.5: 31.1 (#99), Magistral Small: —
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1462 | — |
Multilingual Not comparable
Claude Opus 4.5: 54.5 (#45), Magistral Small: —
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| LMArena Non-English | 1438 | — |
| LMArena Chinese | 1470 | — |
| LMArena French | 1471 | — |
| LMArena German | 1449 | — |
| LMArena Japanese | 1415 | — |
| LMArena Korean | 1424 | — |
| LMArena Russian | 1448 | — |
| LMArena Spanish | 1455 | — |
Instruction Following Not comparable
Claude Opus 4.5: 77.7 (#20), Magistral Small: —
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| LMArena Instruction Following | 1478 | — |
Long Context Not comparable
Claude Opus 4.5: 46.4 (#21), Magistral Small: —
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| CL-bench | 21.1% | — |
| LMArena Longer Query | 1480 | — |
Writing & Preference Not comparable
Claude Opus 4.5: 68.2 (#28), Magistral Small: —
| Benchmark | Claude Opus 4.5 | Magistral Small |
|---|---|---|
| LMArena Text | 1451 | — |
| LMArena Creative Writing | 1445 | — |
| EQ-Bench Creative Writing | 1687 | — |
| LMArena Multi-Turn | 1466 | — |
Frequently asked questions
Is Claude Opus 4.5 better than Magistral Small?
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 29.9 on the Noometry Index. Magistral Small costs 13× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 4.5 or Magistral Small?
Magistral Small is cheaper. It lists at $0.50 per million input tokens and $1.50 per million output tokens; Claude Opus 4.5 lists at $5 and $25.
Is Claude Opus 4.5 or Magistral Small better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 37.8 in the Noometry coding category.
Which has the bigger context window?
Claude Opus 4.5 does, with 200K tokens against 128K.
How many benchmarks do Claude Opus 4.5 and Magistral Small share?
8 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Magistral Small has 10.