Model comparison
gpt-oss-20b vs Phi 3 Mini 128k Instruct
gpt-oss-20b is the stronger model overall, scoring 32.5 to 29.7 on the Noometry Index.
Last verified . 16 shared benchmarks.
MicrosoftSummary
- They share 16 benchmarks with published results for both. gpt-oss-20b scores higher in 7 categories and Phi 3 Mini 128k Instruct in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in multilingual, where gpt-oss-20b leads 42.2 to 25.2.
Side by side
| gpt-oss-20b | Phi 3 Mini 128k Instruct | |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 32.5 | 29.7 |
| Released | 2025-08-05 | 2024-04-23 |
| Weights | Open | Open |
| Context window | 131K | — |
| Max output | 16K | — |
| Input $ / M tokens | $0.018 | — |
| Output $ / M tokens | $0.09 | — |
| Results tracked | 34 | 19 |
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Category by category
Coding gpt-oss-20b leads
gpt-oss-20b: 37.6 (#192), Phi 3 Mini 128k Instruct: 28.8 (#312)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Coding | 1306 | 1039 |
| SciCode | 34.4% | — |
| WeirdML | 40.9% | — |
| BigCodeBench Instruct | — | 29.6% |
| BigCodeBench Complete | — | 40.6% |
| ALE-Bench | 566.05 | — |
Agentic & Tool Use Not comparable
gpt-oss-20b: 9.3 (#154), Phi 3 Mini 128k Instruct: —
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| Terminal-Bench | 3.4% | — |
Reasoning Too close to call
gpt-oss-20b: 19.3 (#261), Phi 3 Mini 128k Instruct: 19.6 (#256)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1274 | 1028 |
| Kagi LLM Benchmark | 53.2% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |
Math gpt-oss-20b leads
gpt-oss-20b: 39.4 (#103), Phi 3 Mini 128k Instruct: 31.6 (#222)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Math | 1317 | 1089 |
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| Omni-MATH | 56.5% | — |
Knowledge gpt-oss-20b leads
gpt-oss-20b: 34.6 (#195), Phi 3 Mini 128k Instruct: 26.8 (#254)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Expert | 1258 | 984 |
| GPQA Diamond | 60.8% | — |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
Multilingual gpt-oss-20b leads
gpt-oss-20b: 42.2 (#197), Phi 3 Mini 128k Instruct: 25.2 (#285)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Non-English | 1268 | 1000 |
| LMArena Chinese | 1314 | 1016 |
| LMArena German | 1255 | 1006 |
| LMArena Japanese | 1244 | 899 |
| LMArena Korean | 1236 | 856 |
| LMArena Russian | 1278 | 1004 |
| LMArena Spanish | 1267 | 1059 |
| LMArena French | — | 1039 |
Instruction Following gpt-oss-20b leads
gpt-oss-20b: 61.8 (#240), Phi 3 Mini 128k Instruct: 51.8 (#294)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Instruction Following | 1236 | 1023 |
| IFEval | 73.2% | — |
Long Context gpt-oss-20b leads
gpt-oss-20b: 37.9 (#209), Phi 3 Mini 128k Instruct: 30.4 (#289)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Longer Query | 1250 | 996 |
Writing & Preference gpt-oss-20b leads
gpt-oss-20b: 35.5 (#265), Phi 3 Mini 128k Instruct: 27.1 (#301)
| Benchmark | gpt-oss-20b | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Text | 1287 | 1050 |
| LMArena Creative Writing | 1201 | 1024 |
| LMArena Multi-Turn | 1268 | 989 |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
Frequently asked questions
Is gpt-oss-20b better than Phi 3 Mini 128k Instruct?
gpt-oss-20b is the stronger model overall, scoring 32.5 to 29.7 on the Noometry Index.
Is gpt-oss-20b or Phi 3 Mini 128k Instruct better for coding?
gpt-oss-20b scores higher on coding benchmarks: 37.6 versus 28.8 in the Noometry coding category.
How many benchmarks do gpt-oss-20b and Phi 3 Mini 128k Instruct share?
16 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Phi 3 Mini 128k Instruct has 19.