Model comparison
Claude Haiku 4.5 vs Molmo 2 8b
Claude Haiku 4.5 and Molmo 2 8b score almost the same on the Noometry Index (39.5 vs 39.1), so choose on price, context window or the category you care about most.
Last verified . 4 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 4 benchmarks with published results for both. Claude Haiku 4.5 scores higher in 3 categories and Molmo 2 8b in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Molmo 2 8b leads 25.6 to 15.1.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Claude Haiku 4.5 | Molmo 2 8b | |
|---|---|---|
| Provider | Anthropic | Allen Institute for AI (Ai2) |
| Noometry Index | 39.5 | 39.1 |
| Released | 2025-10-15 | — |
| Weights | Proprietary | Open |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $1 | — |
| Output $ / M tokens | $5 | — |
| Results tracked | 53 | 5 |
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Category by category
Coding Not comparable
Claude Haiku 4.5: 44.0 (#78), Molmo 2 8b: —
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| SWE-bench Verified (bash only) | 66.6% | — |
| LMArena WebDev | 1330 | — |
| SWE-bench Multilingual | 64.7% | — |
| SciCode | 43.3% | — |
| WeirdML | 45.4% | — |
| LMArena Coding | 1453 | — |
| ALE-Bench | 653.48 | — |
Agentic & Tool Use Not comparable
Claude Haiku 4.5: 33.6 (#52), Molmo 2 8b: —
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| Terminal-Bench | 35.5% | — |
| Berkeley Function Calling Leaderboard | 68.7% | — |
| DeepResearch Bench | 45.5% | — |
| BALROG | 31.2% | — |
| ExploitBench | 13.7% | — |
| Vending-Bench 2 | 458.89 | — |
Reasoning Molmo 2 8b leads
Claude Haiku 4.5: 15.1 (#320), Molmo 2 8b: 25.6 (#146)
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | 1420 | 1287 |
| ARC-AGI-2 | 4% | — |
| NYT Connections (extended) | 14.3% | — |
| ARC-AGI-1 | 47.7% | — |
| CritPt | 0% | — |
| Chess Puzzles | 8% | — |
| DTBench | 73.6% | — |
| LMCA | 30.9% | — |
| Epoch Capabilities Index | 142.41 | — |
| ForecastBench | 61.4 | — |
Math Not comparable
Claude Haiku 4.5: 44.9 (#78), Molmo 2 8b: —
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 66.7% | — |
| Omni-MATH | 56.1% | — |
| LMArena Math | 1396 | — |
| MATH Level 5 | 96.4% | — |
| FrontierMath (Feb 2025 set) | 5.9% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge Not comparable
Claude Haiku 4.5: 37.7 (#153), Molmo 2 8b: —
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 71.2% | — |
| SimpleQA Verified | 13.2% | — |
| MMLU-Pro | 77.7% | — |
| Vectara Hallucination Rate | 9.8% | — |
| GPQA (HELM) | 60.5% | — |
| LMArena Expert | 1442 | — |
Multimodal Molmo 2 8b leads
Claude Haiku 4.5: 26.8 (#118), Molmo 2 8b: 30.2 (#112)
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1420 | — |
Multilingual Claude Haiku 4.5 leads
Claude Haiku 4.5: 49.9 (#129), Molmo 2 8b: 42.7 (#190)
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | 1377 | 1276 |
| LMArena Chinese | 1417 | — |
| LMArena French | 1408 | — |
| LMArena German | 1375 | — |
| LMArena Japanese | 1339 | — |
| LMArena Korean | 1347 | — |
| LMArena Russian | 1381 | — |
| LMArena Spanish | 1420 | — |
Instruction Following Claude Haiku 4.5 leads
Claude Haiku 4.5: 71.4 (#149), Molmo 2 8b: 67.0 (#201)
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | 1414 | 1270 |
| IFEval | 80.1% | — |
Long Context Not comparable
Claude Haiku 4.5: 43.6 (#92), Molmo 2 8b: —
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| LMArena Longer Query | 1427 | — |
Writing & Preference Claude Haiku 4.5 leads
Claude Haiku 4.5: 57.9 (#123), Molmo 2 8b: 49.4 (#191)
| Benchmark | Claude Haiku 4.5 | Molmo 2 8b |
|---|---|---|
| LMArena Text | 1396 | 1288 |
| LMArena Creative Writing | 1372 | — |
| WildBench | 83.9% | — |
| EQ-Bench 4 | 1064 | — |
| LMArena Multi-Turn | 1409 | — |
Frequently asked questions
Is Claude Haiku 4.5 better than Molmo 2 8b?
Claude Haiku 4.5 and Molmo 2 8b score almost the same on the Noometry Index (39.5 vs 39.1), so choose on price, context window or the category you care about most.
How many benchmarks do Claude Haiku 4.5 and Molmo 2 8b share?
4 benchmarks have published results for both models. Claude Haiku 4.5 has 53 scored results on Noometry and Molmo 2 8b has 5.