# Codestral vs GPT-5.1

> GPT-5.1 is the stronger model overall, scoring 49.0 to 30.6 on the Noometry Index. Codestral costs 7.6× less per token, which makes it the better buy when GPT-5.1's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/codestral-vs-gpt-5-1
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Codestral scores higher in 0 categories and GPT-5.1 in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.1 leads 39.8 to 19.8.
- Codestral is cheaper at $0.30 / $0.90 per million input/output tokens, against $1.25 / $10 for GPT-5.1.
- GPT-5.1 accepts more context: 400K tokens versus 256K.

## Snapshot

| | Codestral | GPT-5.1 |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 30.6 | 49.0 |
| Rank | 290 | 53 |
| Context | 256K | 400K |
| Input $/M | $0.30 | $1.25 |
| Output $/M | $0.90 | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Codestral: 27.3 (#321)
- GPT-5.1: 46.4 (#66)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| ALE-Bench | 137.78 | 1,192 |
| SWE-bench Verified | — | 68% |
| SWE-bench Verified (bash only) | — | 66% |
| Aider Polyglot | 11.1% | — |
| LMArena WebDev | — | 1395 |
| SciCode | — | 43.3% |
| GSO | — | 13.7% |
| WeirdML | — | 60.8% |
| BigCodeBench Instruct | 41.8% | — |
| LiveBench Coding | — | 72.5% |
| LMArena Coding | — | 1454 |
| BigCodeBench Complete | 52.5% | — |
| HumanEval+ | 73.8% | — |
| MBPP+ | 61.9% | — |

## Agentic & Tool Use

- Codestral: —
- GPT-5.1: 32.7 (#60)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| Terminal-Bench | — | 47.6% |
| DeepResearch Bench | — | 42.8% |
| LMArena Search | — | 1199 |
| Vending-Bench 2 | — | 1,473 |

## Reasoning

- Codestral: 19.8 (#251)
- GPT-5.1: 39.8 (#58)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| ARC-AGI-2 | — | 17.6% |
| SimpleBench | — | 53.2% |
| Kagi LLM Benchmark | 32.5% | — |
| ARC-AGI-1 | — | 72.8% |
| CritPt | — | 4.9% |
| Chess Puzzles | — | 32% |
| EnigmaEval | — | 11.2% |
| LiveBench Reasoning | — | 95.8% |
| LMArena Hard Prompts | — | 1457 |
| Mystery Game Puzzles | — | 19% |
| DTBench | — | 90.1% |
| LiveBench Data Analysis | — | 72.1% |
| LMCA | — | 43.9% |
| Epoch Capabilities Index | — | 149.64 |
| ForecastBench | — | 58.1 |
| LiveBench | — | 78.8% |

## Math

- Codestral: —
- GPT-5.1: 52.2 (#51)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 88.6% |
| Omni-MATH | — | 46.4% |
| LiveBench Math | — | 94.5% |
| LMArena Math | — | 1447 |
| FrontierMath (Feb 2025 set) | — | 31% |
| FrontierMath Tier 4 (v1) | — | 12.5% |

## Knowledge

- Codestral: —
- GPT-5.1: 50.6 (#71)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 23.7% |
| SimpleQA Verified | — | 48% |
| MMLU-Pro | — | 57.9% |
| Vectara Hallucination Rate | — | 10.9% |
| GPQA (HELM) | — | 44.2% |
| LMArena Expert | — | 1470 |

## Multimodal

- Codestral: —
- GPT-5.1: 44.8 (#19)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| LMArena Vision | — | 1250 |
| VPCT | — | 58.7% |
| LMArena Document | — | 1403 |

## Multilingual

- Codestral: —
- GPT-5.1: 53.8 (#56)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| LMArena Non-English | — | 1431 |
| LMArena Chinese | — | 1495 |
| LMArena French | — | 1450 |
| LMArena German | — | 1438 |
| LMArena Japanese | — | 1453 |
| LMArena Korean | — | 1401 |
| LMArena Russian | — | 1435 |
| LMArena Spanish | — | 1433 |

## Instruction Following

- Codestral: —
- GPT-5.1: 83.9 (#1)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| LiveBench Instruction Following | — | 93.3% |
| IFEval | — | 93.5% |
| LMArena Instruction Following | — | 1443 |

## Long Context

- Codestral: —
- GPT-5.1: 47.6 (#14)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| CL-bench | — | 23.7% |
| CL-bench Life | — | 17.3% |
| LMArena Longer Query | — | 1447 |

## Writing & Preference

- Codestral: —
- GPT-5.1: 64.5 (#55)

| Benchmark | Codestral | GPT-5.1 |
|---|---|---|
| LMArena Text | — | 1443 |
| LMArena Creative Writing | — | 1427 |
| WildBench | — | 86.3% |
| LMArena Multi-Turn | — | 1450 |
| LiveBench Language | — | 80.2% |

## FAQ

### Is Codestral better than GPT-5.1?

GPT-5.1 is the stronger model overall, scoring 49.0 to 30.6 on the Noometry Index. Codestral costs 7.6× less per token, which makes it the better buy when GPT-5.1's lead doesn't matter for your workload.

### Which is cheaper, Codestral or GPT-5.1?

Codestral is cheaper. It lists at $0.30 per million input tokens and $0.90 per million output tokens; GPT-5.1 lists at $1.25 and $10.

### Is Codestral or GPT-5.1 better for coding?

GPT-5.1 scores higher on coding benchmarks: 46.4 versus 27.3 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.1 does, with 400K tokens against 256K.

### How many benchmarks do Codestral and GPT-5.1 share?

1 benchmark has published results for both models. Codestral has 7 scored results on Noometry and GPT-5.1 has 63.