Model comparison
Amazon Nova Experimental Chat 10 20 vs GPT-5.3 Codex
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 42.1 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 41.6.
Side by side
| Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex | |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 42.1 | 45.8 |
| Released | — | 2026-02-05 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.75 |
| Output $ / M tokens | — | $14 |
| Results tracked | 17 | 8 |
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Category by category
Coding GPT-5.3 Codex leads
Amazon Nova Experimental Chat 10 20: 41.6 (#123), GPT-5.3 Codex: 48.6 (#56)
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1409 |
| WeirdML | — | 79.3% |
| LMArena Coding | 1412 | — |
| ALE-Bench | — | 1,655 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 10 20: —, GPT-5.3 Codex: 48.0 (#9)
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |
Reasoning Not comparable
Amazon Nova Experimental Chat 10 20: 28.4 (#106), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex |
|---|---|---|
| LMArena Hard Prompts | 1396 | — |
| Epoch Capabilities Index | — | 156.77 |
Math Not comparable
Amazon Nova Experimental Chat 10 20: 39.0 (#119), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex |
|---|---|---|
| LMArena Math | 1425 | — |
Knowledge Not comparable
Amazon Nova Experimental Chat 10 20: 38.5 (#144), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex |
|---|---|---|
| LMArena Expert | 1386 | — |
Multilingual Not comparable
Amazon Nova Experimental Chat 10 20: 49.5 (#131), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 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-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 1365 | — |
Long Context Not comparable
Amazon Nova Experimental Chat 10 20: 41.7 (#133), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1370 | — |
Writing & Preference Not comparable
Amazon Nova Experimental Chat 10 20: 56.6 (#136), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.3 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-5.3 Codex?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 42.1 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 20 or GPT-5.3 Codex better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 41.6 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 20 and GPT-5.3 Codex share?
0 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and GPT-5.3 Codex has 8.