Model comparison
gpt-oss-20b vs Magistral Medium
Magistral Medium is the stronger model overall, scoring 35.2 to 32.5 on the Noometry Index. gpt-oss-20b costs 76× less per token, which makes it the better buy when Magistral Medium's lead doesn't matter for your workload.
Last verified . 19 shared benchmarks.
Mistral AISummary
- They share 19 benchmarks with published results for both. gpt-oss-20b scores higher in 4 categories and Magistral Medium in 4 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Magistral Medium leads 46.3 to 35.5.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 53.2% for gpt-oss-20b and 16.2% for Magistral Medium.
- gpt-oss-20b is cheaper at $0.018 / $0.09 per million input/output tokens, against $2 / $5 for Magistral Medium.
- Magistral Medium accepts more context: 262K tokens versus 131K.
Side by side
| gpt-oss-20b | Magistral Medium | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 32.5 | 35.2 |
| Released | 2025-08-05 | 2025-03-17 |
| Weights | Open | Open |
| Context window | 131K | 262K |
| Max output | 16K | 16K |
| Input $ / M tokens | $0.018 | $2 |
| Output $ / M tokens | $0.09 | $5 |
| Results tracked | 34 | 22 |
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Category by category
Coding Magistral Medium leads
gpt-oss-20b: 37.6 (#192), Magistral Medium: 39.1 (#161)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| SciCode | 34.4% | 39.2% |
| LMArena Coding | 1306 | 1319 |
| WeirdML | 40.9% | — |
| ALE-Bench | 566.05 | — |
Agentic & Tool Use Not comparable
gpt-oss-20b: 9.3 (#154), Magistral Medium: —
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| Terminal-Bench | 3.4% | — |
Reasoning gpt-oss-20b leads
gpt-oss-20b: 19.3 (#261), Magistral Medium: 8.6 (#348)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| Kagi LLM Benchmark | 53.2% | 16.2% |
| CritPt | 1.4% | 0.3% |
| LMArena Hard Prompts | 1274 | 1267 |
| ARC-AGI-2 | — | 0% |
| ARC-AGI-1 | — | 6.1% |
| Chess Puzzles | 4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |
Math gpt-oss-20b leads
gpt-oss-20b: 39.4 (#103), Magistral Medium: 35.1 (#189)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| LMArena Math | 1317 | 1250 |
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| Omni-MATH | 56.5% | — |
Knowledge gpt-oss-20b leads
gpt-oss-20b: 34.6 (#195), Magistral Medium: 33.5 (#202)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| LMArena Expert | 1258 | 1223 |
| GPQA Diamond | 60.8% | — |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
Multilingual gpt-oss-20b leads
gpt-oss-20b: 42.2 (#197), Magistral Medium: 39.6 (#224)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| LMArena Non-English | 1268 | 1232 |
| LMArena Chinese | 1314 | 1227 |
| LMArena German | 1255 | 1248 |
| LMArena Japanese | 1244 | 1175 |
| LMArena Korean | 1236 | 1125 |
| LMArena Russian | 1278 | 1224 |
| LMArena Spanish | 1267 | 1271 |
| LMArena French | — | 1267 |
Instruction Following Magistral Medium leads
gpt-oss-20b: 61.8 (#240), Magistral Medium: 66.0 (#211)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| LMArena Instruction Following | 1236 | 1254 |
| IFEval | 73.2% | — |
Long Context Magistral Medium leads
gpt-oss-20b: 37.9 (#209), Magistral Medium: 39.3 (#183)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| LMArena Longer Query | 1250 | 1295 |
Writing & Preference Magistral Medium leads
gpt-oss-20b: 35.5 (#265), Magistral Medium: 46.3 (#219)
| Benchmark | gpt-oss-20b | Magistral Medium |
|---|---|---|
| LMArena Text | 1287 | 1255 |
| LMArena Creative Writing | 1201 | 1245 |
| LMArena Multi-Turn | 1268 | 1275 |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
Frequently asked questions
Is gpt-oss-20b better than Magistral Medium?
Magistral Medium is the stronger model overall, scoring 35.2 to 32.5 on the Noometry Index. gpt-oss-20b costs 76× less per token, which makes it the better buy when Magistral Medium's lead doesn't matter for your workload.
Which is cheaper, gpt-oss-20b or Magistral Medium?
gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; Magistral Medium lists at $2 and $5.
Is gpt-oss-20b or Magistral Medium better for coding?
Magistral Medium scores higher on coding benchmarks: 39.1 versus 37.6 in the Noometry coding category.
Which has the bigger context window?
Magistral Medium does, with 262K tokens against 131K.
How many benchmarks do gpt-oss-20b and Magistral Medium share?
19 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Magistral Medium has 22.