Model comparison
Amazon Nova Experimental Chat 10 20 vs GPT-5.1-Codex
Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 42.1 to 38.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where Amazon Nova Experimental Chat 10 20 leads 39.0 to 30.3.
Side by side
| Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex | |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 42.1 | 38.6 |
| Released | — | 2025-11-12 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $10 |
| Results tracked | 17 | 6 |
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Category by category
Coding Too close to call
Amazon Nova Experimental Chat 10 20: 41.6 (#123), GPT-5.1-Codex: 41.9 (#116)
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LMArena Coding | 1412 | — |
| ALE-Bench | — | 1,245 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 10 20: —, GPT-5.1-Codex: 38.0 (#33)
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |
Reasoning Not comparable
Amazon Nova Experimental Chat 10 20: 28.4 (#106), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Hard Prompts | 1396 | — |
Math Amazon Nova Experimental Chat 10 20 leads
Amazon Nova Experimental Chat 10 20: 39.0 (#119), GPT-5.1-Codex: 30.3 (#235)
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| LMArena Math | 1425 | — |
Knowledge Not comparable
Amazon Nova Experimental Chat 10 20: 38.5 (#144), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Expert | 1386 | — |
Multilingual Not comparable
Amazon Nova Experimental Chat 10 20: 49.5 (#131), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1372 | — |
| LMArena Chinese | 1404 | — |
| LMArena French | 1425 | — |
| LMArena German | 1391 | — |
| LMArena Japanese | 1360 | — |
| LMArena Korean | 1324 | — |
| LMArena Russian | 1371 | — |
| LMArena Spanish | 1382 | — |
Instruction Following Not comparable
Amazon Nova Experimental Chat 10 20: 72.1 (#141), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Instruction Following | 1365 | — |
Long Context Not comparable
Amazon Nova Experimental Chat 10 20: 41.7 (#133), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1370 | — |
Writing & Preference Not comparable
Amazon Nova Experimental Chat 10 20: 56.6 (#136), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1394 | — |
| LMArena Creative Writing | 1318 | — |
| LMArena Multi-Turn | 1364 | — |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 20 better than GPT-5.1-Codex?
Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 42.1 to 38.6 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 20 or GPT-5.1-Codex better for coding?
They score almost the same on coding (41.6 vs 41.9); test both on your own repository before choosing.
How many benchmarks do Amazon Nova Experimental Chat 10 20 and GPT-5.1-Codex share?
0 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and GPT-5.1-Codex has 6.