Model comparison
gpt-oss-20b vs Molmo 2 8b
Molmo 2 8b is the stronger model overall, scoring 39.1 to 32.5 on the Noometry Index.
Last verified . 4 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 4 benchmarks with published results for both. gpt-oss-20b scores higher in 0 categories and Molmo 2 8b in 4 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Molmo 2 8b leads 49.4 to 35.5.
Side by side
| gpt-oss-20b | Molmo 2 8b | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 32.5 | 39.1 |
| Released | 2025-08-05 | — |
| Weights | Open | Open |
| Context window | 131K | — |
| Max output | 16K | — |
| Input $ / M tokens | $0.018 | — |
| Output $ / M tokens | $0.09 | — |
| Results tracked | 34 | 5 |
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Category by category
Coding Not comparable
gpt-oss-20b: 37.6 (#192), Molmo 2 8b: —
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| SciCode | 34.4% | — |
| WeirdML | 40.9% | — |
| LMArena Coding | 1306 | — |
| ALE-Bench | 566.05 | — |
Agentic & Tool Use Not comparable
gpt-oss-20b: 9.3 (#154), Molmo 2 8b: —
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| Terminal-Bench | 3.4% | — |
Reasoning Molmo 2 8b leads
gpt-oss-20b: 19.3 (#261), Molmo 2 8b: 25.6 (#146)
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | 1274 | 1287 |
| Kagi LLM Benchmark | 53.2% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |
Math Not comparable
gpt-oss-20b: 39.4 (#103), Molmo 2 8b: —
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| Omni-MATH | 56.5% | — |
| LMArena Math | 1317 | — |
Knowledge Not comparable
gpt-oss-20b: 34.6 (#195), Molmo 2 8b: —
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 60.8% | — |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
| LMArena Expert | 1258 | — |
Multimodal Not comparable
gpt-oss-20b: —, Molmo 2 8b: 30.2 (#112)
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
Multilingual Too close to call
gpt-oss-20b: 42.2 (#197), Molmo 2 8b: 42.7 (#190)
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | 1268 | 1276 |
| LMArena Chinese | 1314 | — |
| LMArena German | 1255 | — |
| LMArena Japanese | 1244 | — |
| LMArena Korean | 1236 | — |
| LMArena Russian | 1278 | — |
| LMArena Spanish | 1267 | — |
Instruction Following Molmo 2 8b leads
gpt-oss-20b: 61.8 (#240), Molmo 2 8b: 67.0 (#201)
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | 1236 | 1270 |
| IFEval | 73.2% | — |
Long Context Not comparable
gpt-oss-20b: 37.9 (#209), Molmo 2 8b: —
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| LMArena Longer Query | 1250 | — |
Writing & Preference Molmo 2 8b leads
gpt-oss-20b: 35.5 (#265), Molmo 2 8b: 49.4 (#191)
| Benchmark | gpt-oss-20b | Molmo 2 8b |
|---|---|---|
| LMArena Text | 1287 | 1288 |
| LMArena Creative Writing | 1201 | — |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
| LMArena Multi-Turn | 1268 | — |
Frequently asked questions
Is gpt-oss-20b better than Molmo 2 8b?
Molmo 2 8b is the stronger model overall, scoring 39.1 to 32.5 on the Noometry Index.
How many benchmarks do gpt-oss-20b and Molmo 2 8b share?
4 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Molmo 2 8b has 5.