# Claude Opus 5 vs Pixtral 12B

> Claude Opus 5 has enough public results to be ranked (#4); Pixtral 12B does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/claude-opus-5-vs-pixtral-12b
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Claude Opus 5 scores higher in 1 category and Pixtral 12B in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in multimodal, where Claude Opus 5 leads 50.8 to 23.9.
- Pixtral 12B is cheaper at $0.15 / $0.15 per million input/output tokens, against $5 / $25 for Claude Opus 5.
- Claude Opus 5 accepts more context: 1M tokens versus 128K.
- Pixtral 12B has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 67.8 | 31.3 |
| Rank | 4 | — |
| Context | 1M | 128K |
| Input $/M | $5 | $0.15 |
| Output $/M | $25 | $0.15 |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 5: 67.5 (#5)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| DeepSWE | 73.6% | — |
| FrontierCode | 53.4% | — |
| CursorBench | 46.6% | — |
| LMArena WebDev | 1691 | — |
| FrontierSWE | 52% | — |
| SciCode | 56.4% | — |
| WeirdML | 91.8% | — |
| LMArena Coding | 1534 | — |
| ALE-Bench | 2,165 | — |

## Agentic & Tool Use

- Claude Opus 5: 55.6 (#1)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| APEX-Agents | 65.8% | — |
| OSWorld 2.0 | 31.4% | — |
| τ²-bench Banking | 48.7% | — |
| PostTrainBench | 35% | — |
| BALROG | 63.4% | — |
| GBAEval | 79.6% | — |
| GDP.pdf | 24% | — |
| Vending-Bench 2 | 11,182 | — |

## Reasoning

- Claude Opus 5: 77.2 (#4)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| ARC-AGI-2 | 90.4% | — |
| SimpleBench | 80.6% | — |
| NYT Connections (extended) | 94.3% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 29.1% | — |
| Chess Puzzles | 42% | — |
| EBR-Bench | 45.7% | — |
| LMArena Hard Prompts | 1526 | — |
| Mystery Game Puzzles | 59% | — |
| DTBench | 97.9% | — |
| LMCA | 64.5% | — |
| Bench to the Future 3 | 0.12 | — |
| Epoch Capabilities Index | 162.78 | — |

## Math

- Claude Opus 5: 86.2 (#8)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| FrontierMath (Tiers 1-3) | 85.6% | — |
| FrontierMath Tier 4 | 73.2% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| ProofBench | 99% | — |
| LMArena Math | 1531 | — |

## Knowledge

- Claude Opus 5: 66.8 (#9)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| SimpleQA Verified | 59.9% | — |
| LMArena Expert | 1557 | — |

## Multimodal

- Claude Opus 5: 50.8 (#8)
- Pixtral 12B: 23.9 (#127)

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| LMArena Vision | 1319 | 1009 |
| GeoBench | — | 37% |
| Blueprint-Bench 2 | 30.4% | — |
| Furniture Assembly | 60.8% | — |
| LMArena Document | 1516 | — |

## Multilingual

- Claude Opus 5: 58.8 (#4)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| LMArena Non-English | 1501 | — |
| LMArena Chinese | 1574 | — |
| LMArena French | 1519 | — |
| LMArena German | 1524 | — |
| LMArena Japanese | 1516 | — |
| LMArena Korean | 1521 | — |
| LMArena Russian | 1507 | — |
| LMArena Spanish | 1519 | — |

## Instruction Following

- Claude Opus 5: 79.2 (#7)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| LMArena Instruction Following | 1517 | — |

## Long Context

- Claude Opus 5: 46.5 (#21)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| LMArena Longer Query | 1515 | — |

## Writing & Preference

- Claude Opus 5: 79.2 (#1)
- Pixtral 12B: —

| Benchmark | Claude Opus 5 | Pixtral 12B |
|---|---|---|
| LMArena Text | 1507 | — |
| LMArena Creative Writing | 1491 | — |
| EQ-Bench Creative Writing | 2133 | — |
| EQ-Bench 4 | 1385 | — |
| LMArena Multi-Turn | 1499 | — |

## FAQ

### Is Claude Opus 5 better than Pixtral 12B?

Claude Opus 5 has enough public results to be ranked (#4); Pixtral 12B does not yet, so treat this comparison as directional.

### Which is cheaper, Claude Opus 5 or Pixtral 12B?

Pixtral 12B is cheaper. It lists at $0.15 per million input tokens and $0.15 per million output tokens; Claude Opus 5 lists at $5 and $25.

### Which has the bigger context window?

Claude Opus 5 does, with 1M tokens against 128K.

### How many benchmarks do Claude Opus 5 and Pixtral 12B share?

1 benchmark has published results for both models. Claude Opus 5 has 57 scored results on Noometry and Pixtral 12B has 2.