Model comparison
Magistral Small vs o3-pro
o3-pro is the stronger model overall, scoring 42.9 to 30.2 on the Noometry Index. Magistral Small costs 47× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.
Last verified . 5 shared benchmarks.
Mistral AISummary
- They share 5 benchmarks with published results for both. Magistral Small scores higher in 1 category and o3-pro in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in coding, where o3-pro leads 55.5 to 38.4.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 6.3% for Magistral Small and 72.1% for o3-pro.
- Magistral Small is cheaper at $0.50 / $1.50 per million input/output tokens, against $20 / $80 for o3-pro.
- o3-pro accepts more context: 200K tokens versus 128K.
- Magistral Small has downloadable open weights; the other is API-only.
Side by side
| Magistral Small | o3-pro | |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 30.2 | 42.9 |
| Released | 2025-06-10 | 2025-06-10 |
| Weights | Open | Proprietary |
| Context window | 128K | 200K |
| Max output | 40K | 100K |
| Input $ / M tokens | $0.50 | $20 |
| Output $ / M tokens | $1.50 | $80 |
| Results tracked | 10 | 12 |
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Category by category
Coding o3-pro leads
Magistral Small: 38.4 (#176), o3-pro: 55.5 (#24)
| Benchmark | Magistral Small | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| SciCode | 35.2% | — |
| WeirdML | — | 58.2% |
Reasoning o3-pro leads
Magistral Small: 6.8 (#350), o3-pro: 23.8 (#171)
| Benchmark | Magistral Small | o3-pro |
|---|---|---|
| ARC-AGI-2 | 0% | 4.9% |
| Kagi LLM Benchmark | 6.3% | 72.1% |
| ARC-AGI-1 | 5% | 59.3% |
| DTBench | 61.3% | 86.9% |
| Epoch Capabilities Index | 133.19 | 147.42 |
| CritPt | 0.3% | — |
| Chess Puzzles | 3% | — |
| LMCA | — | 38.5% |
Math Not comparable
Magistral Small: 26.2 (#261), o3-pro: —
| Benchmark | Magistral Small | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 30% | — |
Knowledge Magistral Small leads
Magistral Small: 30.9 (#223), o3-pro: 29.5 (#238)
| Benchmark | Magistral Small | o3-pro |
|---|---|---|
| GPQA Diamond | 56.1% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
Long Context Not comparable
Magistral Small: —, o3-pro: 72.2 (#1)
| Benchmark | Magistral Small | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
Writing & Preference Not comparable
Magistral Small: —, o3-pro: 57.1 (#133)
| Benchmark | Magistral Small | o3-pro |
|---|---|---|
| Short-Story Creative Writing | — | 84.4% |
Frequently asked questions
Is Magistral Small better than o3-pro?
o3-pro is the stronger model overall, scoring 42.9 to 30.2 on the Noometry Index. Magistral Small costs 47× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.
Which is cheaper, Magistral Small or o3-pro?
Magistral Small is cheaper. It lists at $0.50 per million input tokens and $1.50 per million output tokens; o3-pro lists at $20 and $80.
Is Magistral Small or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 38.4 in the Noometry coding category.
Which has the bigger context window?
o3-pro does, with 200K tokens against 128K.
How many benchmarks do Magistral Small and o3-pro share?
5 benchmarks have published results for both models. Magistral Small has 10 scored results on Noometry and o3-pro has 12.