Model comparison
GPT-4.1 nano vs Molmo 2 8b
Molmo 2 8b is the stronger model overall, scoring 38.7 to 27.7 on the Noometry Index.
Last verified . 5 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 5 benchmarks with published results for both. GPT-4.1 nano scores higher in 1 category and Molmo 2 8b in 4 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Molmo 2 8b leads 24.5 to 8.6.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| GPT-4.1 nano | Molmo 2 8b | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 27.7 | 38.7 |
| Released | 2025-04-14 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 33K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.40 | — |
| Results tracked | 38 | 5 |
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Category by category
Coding Not comparable
GPT-4.1 nano: 23.8 (#325), Molmo 2 8b: —
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| Aider Polyglot | 8.9% | — |
| SciCode | 25.9% | — |
| WeirdML | 19% | — |
| LMArena Coding | 1306 | — |
Agentic & Tool Use Not comparable
GPT-4.1 nano: 26.3 (#98), Molmo 2 8b: —
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| Berkeley Function Calling Leaderboard | 33% | — |
Reasoning Molmo 2 8b leads
GPT-4.1 nano: 8.6 (#344), Molmo 2 8b: 24.5 (#146)
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | 1286 | 1288 |
| ARC-AGI-2 | 0% | — |
| Kagi LLM Benchmark | 33.3% | — |
| ARC-AGI-1 | 0% | — |
| CritPt | 0% | — |
| DTBench | 52.5% | — |
| LMCA | 5.5% | — |
| Epoch Capabilities Index | 129.62 | — |
Math Not comparable
GPT-4.1 nano: 25.5 (#246), Molmo 2 8b: —
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 28.9% | — |
| Omni-MATH | 36.7% | — |
| LMArena Math | 1274 | — |
| MATH Level 5 | 70% | — |
| FrontierMath (Feb 2025 set) | 1% | — |
Knowledge Not comparable
GPT-4.1 nano: 21.8 (#268), Molmo 2 8b: —
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 48.9% | — |
| SimpleQA Verified | 6% | — |
| MMLU-Pro | 55% | — |
| GPQA (HELM) | 50.7% | — |
| LMArena Expert | 1272 | — |
Multimodal Too close to call
GPT-4.1 nano: 28.6 (#108), Molmo 2 8b: 29.5 (#106)
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| LMArena Vision | 1063 | 1081 |
Multilingual Molmo 2 8b leads
GPT-4.1 nano: 41.8 (#200), Molmo 2 8b: 42.8 (#186)
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | 1260 | 1275 |
| LMArena Chinese | 1270 | — |
| LMArena German | 1288 | — |
| LMArena Japanese | 1199 | — |
| LMArena Russian | 1261 | — |
Instruction Following Too close to call
GPT-4.1 nano: 68.0 (#188), Molmo 2 8b: 67.2 (#196)
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | 1267 | 1270 |
| IFEval | 84.3% | — |
Long Context Not comparable
GPT-4.1 nano: 23.7 (#291), Molmo 2 8b: —
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| Fiction.LiveBench | 25% | — |
| LMArena Longer Query | 1283 | — |
Writing & Preference Molmo 2 8b leads
GPT-4.1 nano: 40.7 (#238), Molmo 2 8b: 49.5 (#187)
| Benchmark | GPT-4.1 nano | Molmo 2 8b |
|---|---|---|
| LMArena Text | 1285 | 1288 |
| LMArena Creative Writing | 1260 | — |
| EQ-Bench Creative Writing | 946 | — |
| WildBench | 81.2% | — |
| LMArena Multi-Turn | 1277 | — |
Frequently asked questions
Is GPT-4.1 nano better than Molmo 2 8b?
Molmo 2 8b is the stronger model overall, scoring 38.7 to 27.7 on the Noometry Index.
How many benchmarks do GPT-4.1 nano and Molmo 2 8b share?
5 benchmarks have published results for both models. GPT-4.1 nano has 38 scored results on Noometry and Molmo 2 8b has 5.