# GPT-5.5 vs Mistral Nemo

> GPT-5.5 is the stronger model overall, scoring 63.4 to 26.4 on the Noometry Index. Mistral Nemo costs 75× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-5-vs-mistral-nemo
- Last updated: 2026-10-11
- Shared benchmarks: 4

## Summary

- They share 4 benchmarks with published results for both. GPT-5.5 scores higher in 5 categories and Mistral Nemo in 0 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 leads 81.7 to 25.5.
- The biggest single-benchmark swing is GPQA Diamond: 94% for GPT-5.5 and 29.9% for Mistral Nemo.
- Mistral Nemo is cheaper at $0.15 / $0.15 per million input/output tokens, against $5 / $30 for GPT-5.5.
- GPT-5.5 accepts more context: 1.05M tokens versus 128K.
- Mistral Nemo has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 | Mistral Nemo |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 63.4 | 26.4 |
| Rank | 9 | 337 |
| Context | 1.05M | 128K |
| Input $/M | $5 | $0.15 |
| Output $/M | $30 | $0.15 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5: 58.2 (#17)
- Mistral Nemo: —

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| SWE-bench Verified | 80.6% | — |
| DeepSWE | 67% | — |
| FrontierCode | 43% | — |
| LMArena WebDev | 1513 | — |
| SciCode | 56.1% | — |
| GSO | 40.2% | — |
| WeirdML | 84.9% | — |
| LMArena Coding | 1494 | — |
| MirrorCode | 10% | — |
| ALE-Bench | 1,943 | — |

## Agentic & Tool Use

- GPT-5.5: 50.7 (#6)
- Mistral Nemo: 23.5 (#125)

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| Terminal-Bench | 84.7% | — |
| APEX-Agents | 55.1% | — |
| Berkeley Function Calling Leaderboard | — | 27.6% |
| OSWorld 2.0 | 13% | — |
| Remote Labor Index | 6.3% | — |
| τ²-bench Banking | 44.6% | — |
| DeepResearch Bench | 54% | — |
| PostTrainBench | 27.2% | — |
| BALROG | — | 17.6% |
| ExploitBench | 47.4% | — |
| GBAEval | 53.2% | — |
| GDP.pdf | 26% | — |
| LMArena Search | 1242 | — |
| Vending-Bench 2 | 7,524 | — |

## Reasoning

- GPT-5.5: 72.8 (#11)
- Mistral Nemo: 20.7 (#232)

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| DTBench | 96% | 48.6% |
| Epoch Capabilities Index | 159.1 | 118.68 |
| ARC-AGI-2 | 85% | — |
| SimpleBench | 69% | — |
| Kagi LLM Benchmark | 88.8% | — |
| NYT Connections (extended) | 96.2% | — |
| ARC-AGI-1 | 95% | — |
| CritPt | 27.1% | — |
| Chess Puzzles | 54% | — |
| EBR-Bench | 34.3% | — |
| LMArena Hard Prompts | 1489 | — |
| Mystery Game Puzzles | 56% | — |
| LMCA | 54.3% | — |
| Surface Evolver Bench | 88.1% | — |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | 60.6 | — |
| PIQA | — | 83.5% |

## Math

- GPT-5.5: 81.7 (#11)
- Mistral Nemo: 25.5 (#268)

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| FrontierMath (Tiers 1-3) | 85.3% | — |
| FrontierMath Tier 4 | 72.5% | — |
| MathArena Final-Answer Competitions | 94.3% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 50% | — |
| LMArena Math | 1486 | — |
| MATH Level 5 | — | 10.8% |
| FrontierMath (Feb 2025 set) | 51.7% | — |
| FrontierMath Erdős | 0% | — |
| FrontierMath Tier 4 (v1) | 35.4% | — |
| GSM8K | — | 84.2% |

## Knowledge

- GPT-5.5: 64.4 (#17)
- Mistral Nemo: 12.3 (#298)

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| GPQA Diamond | 94% | 29.9% |
| SimpleQA Verified | 63% | — |
| Vectara Hallucination Rate | 9.3% | — |
| LMArena Expert | 1508 | — |
| BoolQ | — | 82.5% |

## Multimodal

- GPT-5.5: 46.9 (#12)
- Mistral Nemo: —

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| LMArena Vision | 1297 | — |
| Blueprint-Bench 2 | 36.2% | — |
| Furniture Assembly | 44.2% | — |
| LMArena Document | 1486 | — |

## Multilingual

- GPT-5.5: 56.4 (#20)
- Mistral Nemo: —

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| LMArena Non-English | 1467 | — |
| LMArena Chinese | 1533 | — |
| LMArena French | 1486 | — |
| LMArena German | 1480 | — |
| LMArena Japanese | 1498 | — |
| LMArena Korean | 1460 | — |
| LMArena Russian | 1473 | — |
| LMArena Spanish | 1468 | — |

## Instruction Following

- GPT-5.5: 77.5 (#18)
- Mistral Nemo: —

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| LMArena Instruction Following | 1479 | — |

## Long Context

- GPT-5.5: 48.3 (#12)
- Mistral Nemo: —

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| CL-bench Life | 22.2% | — |
| LMArena Longer Query | 1484 | — |

## Writing & Preference

- GPT-5.5: 72.7 (#13)
- Mistral Nemo: 28.5 (#296)

| Benchmark | GPT-5.5 | Mistral Nemo |
|---|---|---|
| EQ-Bench Creative Writing | 1844 | 881 |
| LMArena Text | 1472 | — |
| LMArena Creative Writing | 1455 | — |
| EQ-Bench 4 | 1315 | — |
| LMArena Multi-Turn | 1476 | — |

## FAQ

### Is GPT-5.5 better than Mistral Nemo?

GPT-5.5 is the stronger model overall, scoring 63.4 to 26.4 on the Noometry Index. Mistral Nemo costs 75× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.5 or Mistral Nemo?

Mistral Nemo is cheaper. It lists at $0.15 per million input tokens and $0.15 per million output tokens; GPT-5.5 lists at $5 and $30.

### Which has the bigger context window?

GPT-5.5 does, with 1.05M tokens against 128K.

### How many benchmarks do GPT-5.5 and Mistral Nemo share?

4 benchmarks have published results for both models. GPT-5.5 has 71 scored results on Noometry and Mistral Nemo has 10.