Model comparison
gpt-oss-120b vs Molmo 2 8b
Molmo 2 8b is the stronger model overall, scoring 39.1 to 36.3 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-120b scores higher in 2 categories and Molmo 2 8b in 2 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Molmo 2 8b leads 25.6 to 20.0.
Side by side
| gpt-oss-120b | Molmo 2 8b | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 36.3 | 39.1 |
| Released | 2025-08-05 | — |
| Weights | Open | Open |
| Context window | 131K | — |
| Max output | 41K | — |
| Input $ / M tokens | $0.037 | — |
| Output $ / M tokens | $0.17 | — |
| Results tracked | 48 | 5 |
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Category by category
Coding Not comparable
gpt-oss-120b: 33.5 (#256), Molmo 2 8b: —
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| SWE-bench Verified (bash only) | 26% | — |
| Aider Polyglot | 41.8% | — |
| SciCode | 36% | — |
| WeirdML | 48.2% | — |
| LMArena Coding | 1380 | — |
| ALE-Bench | 575.62 | — |
| AlgoTune | 1.41 | — |
Agentic & Tool Use Not comparable
gpt-oss-120b: 12.2 (#153), Molmo 2 8b: —
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| Terminal-Bench | 18.7% | — |
| APEX-Agents | 4.4% | — |
| METR Time Horizons | 56.6% | — |
| Vending-Bench 2 | -21.53 | — |
Reasoning Molmo 2 8b leads
gpt-oss-120b: 20.0 (#245), Molmo 2 8b: 25.6 (#146)
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | 1364 | 1287 |
| SimpleBench | 22.1% | — |
| Kagi LLM Benchmark | 58.6% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 20% | — |
| Mystery Game Puzzles | 2% | — |
| DTBench | 76.3% | — |
| LMCA | 22.1% | — |
| Surface Evolver Bench | 25% | — |
| Epoch Capabilities Index | 139.93 | — |
Math Not comparable
gpt-oss-120b: 52.5 (#50), Molmo 2 8b: —
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| Omni-MATH | 68.8% | — |
| LMArena Math | 1389 | — |
Knowledge Not comparable
gpt-oss-120b: 42.4 (#96), Molmo 2 8b: —
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 75.8% | — |
| MMLU-Pro | 79.5% | — |
| Confabulations | 15.7% | — |
| Vectara Hallucination Rate | 14.2% | — |
| GPQA (HELM) | 68.4% | — |
| LMArena Expert | 1356 | — |
Multimodal Not comparable
gpt-oss-120b: —, Molmo 2 8b: 30.2 (#112)
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
Multilingual gpt-oss-120b leads
gpt-oss-120b: 48.0 (#147), Molmo 2 8b: 42.7 (#190)
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | 1351 | 1276 |
| LMArena Chinese | 1385 | — |
| LMArena French | 1369 | — |
| LMArena German | 1353 | — |
| LMArena Japanese | 1331 | — |
| LMArena Korean | 1282 | — |
| LMArena Russian | 1343 | — |
| LMArena Spanish | 1389 | — |
Instruction Following gpt-oss-120b leads
gpt-oss-120b: 69.3 (#173), Molmo 2 8b: 67.0 (#201)
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | 1318 | 1270 |
| IFEval | 83.6% | — |
Long Context Not comparable
gpt-oss-120b: 31.4 (#278), Molmo 2 8b: —
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| Fiction.LiveBench | 44.4% | — |
| LMArena Longer Query | 1319 | — |
Writing & Preference Molmo 2 8b leads
gpt-oss-120b: 46.5 (#217), Molmo 2 8b: 49.4 (#191)
| Benchmark | gpt-oss-120b | Molmo 2 8b |
|---|---|---|
| LMArena Text | 1365 | 1288 |
| LMArena Creative Writing | 1275 | — |
| Short-Story Creative Writing | 77.1% | — |
| EQ-Bench Creative Writing | 961 | — |
| WildBench | 84.5% | — |
| LMArena Multi-Turn | 1340 | — |
Frequently asked questions
Is gpt-oss-120b better than Molmo 2 8b?
Molmo 2 8b is the stronger model overall, scoring 39.1 to 36.3 on the Noometry Index.
How many benchmarks do gpt-oss-120b and Molmo 2 8b share?
4 benchmarks have published results for both models. gpt-oss-120b has 48 scored results on Noometry and Molmo 2 8b has 5.