Model comparison
GPT-5.1-Codex vs Magistral Small
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 30.2 on the Noometry Index. Magistral Small costs 4.6× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Mistral AISummary
- The widest gap is in math, where GPT-5.1-Codex leads 30.3 to 26.2.
- Magistral Small is cheaper at $0.50 / $1.50 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 128K.
- Magistral Small has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Magistral Small | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 38.6 | 30.2 |
| Released | 2025-11-12 | 2025-06-10 |
| Weights | Proprietary | Open |
| Context window | 400K | 128K |
| Max output | 128K | 40K |
| Input $ / M tokens | $1.25 | $0.50 |
| Output $ / M tokens | $10 | $1.50 |
| Results tracked | 6 | 10 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Magistral Small: 38.4 (#176)
| Benchmark | GPT-5.1-Codex | Magistral Small |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| SciCode | — | 35.2% |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Magistral Small: —
| Benchmark | GPT-5.1-Codex | Magistral Small |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Magistral Small: 6.8 (#350)
| Benchmark | GPT-5.1-Codex | Magistral Small |
|---|---|---|
| ARC-AGI-2 | — | 0% |
| Kagi LLM Benchmark | — | 6.3% |
| ARC-AGI-1 | — | 5% |
| CritPt | — | 0.3% |
| Chess Puzzles | — | 3% |
| DTBench | — | 61.3% |
| Epoch Capabilities Index | — | 133.19 |
Math GPT-5.1-Codex leads
GPT-5.1-Codex: 30.3 (#235), Magistral Small: 26.2 (#261)
| Benchmark | GPT-5.1-Codex | Magistral Small |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 30% |
| ProofBench | 9% | — |
Knowledge Not comparable
GPT-5.1-Codex: —, Magistral Small: 30.9 (#223)
| Benchmark | GPT-5.1-Codex | Magistral Small |
|---|---|---|
| GPQA Diamond | — | 56.1% |
Frequently asked questions
Is GPT-5.1-Codex better than Magistral Small?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 30.2 on the Noometry Index. Magistral Small costs 4.6× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Which is cheaper, GPT-5.1-Codex or Magistral Small?
Magistral Small is cheaper. It lists at $0.50 per million input tokens and $1.50 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Magistral Small better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 38.4 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 128K.
How many benchmarks do GPT-5.1-Codex and Magistral Small share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Magistral Small has 10.