Model comparison
Codestral vs GPT-5 Nano
GPT-5 Nano is the stronger model overall, scoring 33.4 to 30.1 on the Noometry Index.
Last verified . 2 shared benchmarks.
Mistral AISummary
- They share 2 benchmarks with published results for both. Codestral scores higher in 1 category and GPT-5 Nano in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-5 Nano leads 33.3 to 26.9.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 32.5% for Codestral and 62.2% for GPT-5 Nano.
- GPT-5 Nano is cheaper at $0.05 / $0.40 per million input/output tokens, against $0.30 / $0.90 for Codestral.
- GPT-5 Nano accepts more context: 400K tokens versus 256K.
- Codestral has downloadable open weights; the other is API-only.
Side by side
| Codestral | GPT-5 Nano | |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 30.1 | 33.4 |
| Released | 2024-05-29 | 2025-08-07 |
| Weights | Open | Proprietary |
| Context window | 256K | 400K |
| Max output | 4K | 128K |
| Input $ / M tokens | $0.30 | $0.05 |
| Output $ / M tokens | $0.90 | $0.40 |
| Results tracked | 7 | 48 |
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Category by category
Coding GPT-5 Nano leads
Codestral: 26.9 (#316), GPT-5 Nano: 33.3 (#248)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| ALE-Bench | 137.78 | 718.67 |
| SWE-bench Verified (bash only) | — | 34.8% |
| Aider Polyglot | 11.1% | — |
| WeirdML | — | 38.1% |
| BigCodeBench Instruct | 41.8% | — |
| LMArena Coding | — | 1351 |
| BigCodeBench Complete | 52.5% | — |
| HumanEval+ | 73.8% | — |
| MBPP+ | 61.9% | — |
Agentic & Tool Use Not comparable
Codestral: —, GPT-5 Nano: 25.6 (#99)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| Terminal-Bench | — | 21.8% |
| Berkeley Function Calling Leaderboard | — | 51.5% |
Reasoning Codestral leads
Codestral: 19.1 (#244), GPT-5 Nano: 16.4 (#291)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| Kagi LLM Benchmark | 32.5% | 62.2% |
| ARC-AGI-2 | — | 2.6% |
| ARC-AGI-1 | — | 20.7% |
| Chess Puzzles | — | 27% |
| LMArena Hard Prompts | — | 1329 |
| Mystery Game Puzzles | — | 9% |
| DTBench | — | 62.7% |
| LMCA | — | 7.9% |
| Epoch Capabilities Index | — | 139.39 |
| ForecastBench | — | 59.1 |
Math Not comparable
Codestral: —, GPT-5 Nano: 29.1 (#221)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 20% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 81.1% |
| ProofBench | — | 12% |
| Omni-MATH | — | 54.6% |
| LMArena Math | — | 1318 |
| MATH Level 5 | — | 95.2% |
| FrontierMath (Feb 2025 set) | — | 8.3% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Not comparable
Codestral: —, GPT-5 Nano: 35.8 (#166)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| GPQA Diamond | — | 69.4% |
| SimpleQA Verified | — | 11.7% |
| MMLU-Pro | — | 77.8% |
| Vectara Hallucination Rate | — | 10.5% |
| GPQA (HELM) | — | 67.9% |
| LMArena Expert | — | 1321 |
Multimodal Not comparable
Codestral: —, GPT-5 Nano: 30.7 (#102)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| LMArena Vision | — | 1159 |
| VPCT | — | 37.2% |
Multilingual Not comparable
Codestral: —, GPT-5 Nano: 45.5 (#167)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| LMArena Non-English | — | 1313 |
| LMArena Chinese | — | 1355 |
| LMArena German | — | 1329 |
| LMArena Korean | — | 1269 |
| LMArena Russian | — | 1296 |
| LMArena Spanish | — | 1360 |
Instruction Following Not comparable
Codestral: —, GPT-5 Nano: 75.2 (#72)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| IFEval | — | 93.2% |
| LMArena Instruction Following | — | 1306 |
Long Context Not comparable
Codestral: —, GPT-5 Nano: 31.3 (#275)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| Fiction.LiveBench | — | 44.4% |
| LMArena Longer Query | — | 1313 |
Writing & Preference Not comparable
Codestral: —, GPT-5 Nano: 39.4 (#244)
| Benchmark | Codestral | GPT-5 Nano |
|---|---|---|
| LMArena Text | — | 1320 |
| LMArena Creative Writing | — | 1250 |
| EQ-Bench Creative Writing | — | 705 |
| WildBench | — | 80.6% |
| LMArena Multi-Turn | — | 1311 |
Frequently asked questions
Is Codestral better than GPT-5 Nano?
GPT-5 Nano is the stronger model overall, scoring 33.4 to 30.1 on the Noometry Index.
Which is cheaper, Codestral or GPT-5 Nano?
GPT-5 Nano is cheaper. It lists at $0.05 per million input tokens and $0.40 per million output tokens; Codestral lists at $0.30 and $0.90.
Is Codestral or GPT-5 Nano better for coding?
GPT-5 Nano scores higher on coding benchmarks: 33.3 versus 26.9 in the Noometry coding category.
Which has the bigger context window?
GPT-5 Nano does, with 400K tokens against 256K.
How many benchmarks do Codestral and GPT-5 Nano share?
2 benchmarks have published results for both models. Codestral has 7 scored results on Noometry and GPT-5 Nano has 48.