Model comparison
GPT-5.5 Instant vs Molmo 2 8b
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 39.1 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-5.5 Instant scores higher in 4 categories and Molmo 2 8b in 1 category; 4 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.5 Instant leads 61.8 to 49.4.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Instant | Molmo 2 8b | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 42.7 | 39.1 |
| Released | 2026-05-05 | — |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 27 | 5 |
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Category by category
Coding Not comparable
GPT-5.5 Instant: 44.3 (#74), Molmo 2 8b: —
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| SciCode | 48.6% | — |
| LMArena Coding | 1433 | — |
Reasoning Too close to call
GPT-5.5 Instant: 24.9 (#155), Molmo 2 8b: 25.6 (#146)
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1287 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math Not comparable
GPT-5.5 Instant: 26.5 (#259), Molmo 2 8b: —
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| LMArena Math | 1420 | — |
Knowledge Not comparable
GPT-5.5 Instant: 48.9 (#74), Molmo 2 8b: —
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 82.5% | — |
| LMArena Expert | 1409 | — |
Multimodal GPT-5.5 Instant leads
GPT-5.5 Instant: 40.0 (#52), Molmo 2 8b: 30.2 (#112)
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| LMArena Vision | 1250 | 1081 |
| LMArena Document | 1403 | — |
Multilingual GPT-5.5 Instant leads
GPT-5.5 Instant: 52.8 (#80), Molmo 2 8b: 42.7 (#190)
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | 1417 | 1276 |
| LMArena Chinese | 1456 | — |
| LMArena French | 1428 | — |
| LMArena German | 1411 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1392 | — |
| LMArena Russian | 1431 | — |
| LMArena Spanish | 1429 | — |
Instruction Following GPT-5.5 Instant leads
GPT-5.5 Instant: 74.2 (#100), Molmo 2 8b: 67.0 (#201)
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | 1406 | 1270 |
Long Context Not comparable
GPT-5.5 Instant: 43.4 (#96), Molmo 2 8b: —
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| LMArena Longer Query | 1422 | — |
Writing & Preference GPT-5.5 Instant leads
GPT-5.5 Instant: 61.8 (#85), Molmo 2 8b: 49.4 (#191)
| Benchmark | GPT-5.5 Instant | Molmo 2 8b |
|---|---|---|
| LMArena Text | 1419 | 1288 |
| LMArena Creative Writing | 1419 | — |
| LMArena Multi-Turn | 1433 | — |
Frequently asked questions
Is GPT-5.5 Instant better than Molmo 2 8b?
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 39.1 on the Noometry Index.
How many benchmarks do GPT-5.5 Instant and Molmo 2 8b share?
5 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Molmo 2 8b has 5.