Model comparison
Codestral vs GPT-5-Codex
GPT-5-Codex is the stronger model overall, scoring 37.9 to 30.6 on the Noometry Index. Codestral costs 7.6× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
Mistral AISummary
- They share 1 benchmark with published results for both. Codestral scores higher in 0 categories and GPT-5-Codex in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-5-Codex leads 42.4 to 27.3.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 32.5% for Codestral and 70.3% for GPT-5-Codex.
- Codestral is cheaper at $0.30 / $0.90 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- GPT-5-Codex accepts more context: 400K tokens versus 256K.
Side by side
| Codestral | GPT-5-Codex | |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 30.6 | 37.9 |
| Released | 2024-05-29 | 2025-09-15 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 400K |
| Max output | 8K | 128K |
| Input $ / M tokens | $0.30 | $1.25 |
| Output $ / M tokens | $0.90 | $10 |
| Results tracked | 7 | 3 |
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Category by category
Coding GPT-5-Codex leads
Codestral: 27.3 (#321), GPT-5-Codex: 42.4 (#103)
| Benchmark | Codestral | GPT-5-Codex |
|---|---|---|
| Aider Polyglot | 11.1% | — |
| WeirdML | — | 54.5% |
| BigCodeBench Instruct | 41.8% | — |
| BigCodeBench Complete | 52.5% | — |
| ALE-Bench | 137.78 | — |
| HumanEval+ | 73.8% | — |
| MBPP+ | 61.9% | — |
Agentic & Tool Use Not comparable
Codestral: —, GPT-5-Codex: 31.0 (#72)
| Benchmark | Codestral | GPT-5-Codex |
|---|---|---|
| Terminal-Bench | — | 44.3% |
Reasoning GPT-5-Codex leads
Codestral: 19.8 (#251), GPT-5-Codex: 30.9 (#83)
| Benchmark | Codestral | GPT-5-Codex |
|---|---|---|
| Kagi LLM Benchmark | 32.5% | 70.3% |
Frequently asked questions
Is Codestral better than GPT-5-Codex?
GPT-5-Codex is the stronger model overall, scoring 37.9 to 30.6 on the Noometry Index. Codestral costs 7.6× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.
Which is cheaper, Codestral or GPT-5-Codex?
Codestral is cheaper. It lists at $0.30 per million input tokens and $0.90 per million output tokens; GPT-5-Codex lists at $1.25 and $10.
Is Codestral or GPT-5-Codex better for coding?
GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 27.3 in the Noometry coding category.
Which has the bigger context window?
GPT-5-Codex does, with 400K tokens against 256K.
How many benchmarks do Codestral and GPT-5-Codex share?
1 benchmark has published results for both models. Codestral has 7 scored results on Noometry and GPT-5-Codex has 3.