Model comparison
GPT-5.1-Codex vs Molmo 2 8b
GPT-5.1-Codex and Molmo 2 8b score almost the same on the Noometry Index (38.6 vs 39.1), so choose on price, context window or the category you care about most.
Last verified . 0 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Molmo 2 8b | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 38.6 | 39.1 |
| Released | 2025-11-12 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 6 | 5 |
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Category by category
Coding Not comparable
GPT-5.1-Codex: 41.9 (#116), Molmo 2 8b: —
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Molmo 2 8b: —
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Molmo 2 8b: 25.6 (#146)
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | — | 1287 |
Math Not comparable
GPT-5.1-Codex: 30.3 (#235), Molmo 2 8b: —
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| ProofBench | 9% | — |
Multimodal Not comparable
GPT-5.1-Codex: —, Molmo 2 8b: 30.2 (#112)
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
Multilingual Not comparable
GPT-5.1-Codex: —, Molmo 2 8b: 42.7 (#190)
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | — | 1276 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Molmo 2 8b: 67.0 (#201)
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | — | 1270 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Molmo 2 8b: 49.4 (#191)
| Benchmark | GPT-5.1-Codex | Molmo 2 8b |
|---|---|---|
| LMArena Text | — | 1288 |
Frequently asked questions
Is GPT-5.1-Codex better than Molmo 2 8b?
GPT-5.1-Codex and Molmo 2 8b score almost the same on the Noometry Index (38.6 vs 39.1), so choose on price, context window or the category you care about most.
How many benchmarks do GPT-5.1-Codex and Molmo 2 8b share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Molmo 2 8b has 5.