Model comparison
GPT-5.3 Codex vs Molmo 2 8b
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 39.1 on the Noometry Index.
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-5.3 Codex | Molmo 2 8b | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 45.8 | 39.1 |
| Released | 2026-02-05 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 8 | 5 |
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Category by category
Coding Not comparable
GPT-5.3 Codex: 48.6 (#56), Molmo 2 8b: —
| Benchmark | GPT-5.3 Codex | Molmo 2 8b |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), Molmo 2 8b: —
| Benchmark | GPT-5.3 Codex | Molmo 2 8b |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Molmo 2 8b: 25.6 (#146)
| Benchmark | GPT-5.3 Codex | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | — | 1287 |
| Epoch Capabilities Index | 156.77 | — |
Multimodal Not comparable
GPT-5.3 Codex: —, Molmo 2 8b: 30.2 (#112)
| Benchmark | GPT-5.3 Codex | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
Multilingual Not comparable
GPT-5.3 Codex: —, Molmo 2 8b: 42.7 (#190)
| Benchmark | GPT-5.3 Codex | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | — | 1276 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Molmo 2 8b: 67.0 (#201)
| Benchmark | GPT-5.3 Codex | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | — | 1270 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Molmo 2 8b: 49.4 (#191)
| Benchmark | GPT-5.3 Codex | Molmo 2 8b |
|---|---|---|
| LMArena Text | — | 1288 |
Frequently asked questions
Is GPT-5.3 Codex better than Molmo 2 8b?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 39.1 on the Noometry Index.
How many benchmarks do GPT-5.3 Codex and Molmo 2 8b share?
0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Molmo 2 8b has 5.