Model comparison
Amazon Nova Experimental Chat 12 10 vs GPT-5.3 Codex
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 42.9 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 42.2.
Side by side
| Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex | |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 42.9 | 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 | 12 | 8 |
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Category by category
Coding GPT-5.3 Codex leads
Amazon Nova Experimental Chat 12 10: 42.2 (#110), GPT-5.3 Codex: 48.6 (#56)
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1409 |
| WeirdML | — | 79.3% |
| LMArena Coding | 1430 | — |
| ALE-Bench | — | 1,655 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 12 10: —, GPT-5.3 Codex: 48.0 (#9)
| Benchmark | Amazon Nova Experimental Chat 12 10 | 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 12 10: 29.3 (#94), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| LMArena Hard Prompts | 1427 | — |
| Epoch Capabilities Index | — | 156.77 |
Math Not comparable
Amazon Nova Experimental Chat 12 10: 38.9 (#124), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| LMArena Math | 1419 | — |
Knowledge Not comparable
Amazon Nova Experimental Chat 12 10: 39.2 (#136), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| LMArena Expert | 1408 | — |
Multilingual Not comparable
Amazon Nova Experimental Chat 12 10: 51.4 (#108), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1398 | — |
| LMArena Chinese | 1440 | — |
| LMArena Russian | 1395 | — |
Instruction Following Not comparable
Amazon Nova Experimental Chat 12 10: 73.2 (#123), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 1387 | — |
Long Context Not comparable
Amazon Nova Experimental Chat 12 10: 42.4 (#125), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1391 | — |
Writing & Preference Not comparable
Amazon Nova Experimental Chat 12 10: 59.5 (#110), GPT-5.3 Codex: —
| Benchmark | Amazon Nova Experimental Chat 12 10 | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1420 | — |
| LMArena Creative Writing | 1350 | — |
| LMArena Multi-Turn | 1409 | — |
Frequently asked questions
Is Amazon Nova Experimental Chat 12 10 better than GPT-5.3 Codex?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 42.9 on the Noometry Index.
Is Amazon Nova Experimental Chat 12 10 or GPT-5.3 Codex better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 42.2 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 12 10 and GPT-5.3 Codex share?
0 benchmarks have published results for both models. Amazon Nova Experimental Chat 12 10 has 12 scored results on Noometry and GPT-5.3 Codex has 8.