Model comparison
Claude 2.1 vs GPT-5.3 Chat
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 25.2 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 10.2.
Side by side
| Claude 2.1 | GPT-5.3 Chat | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 25.2 | 42.8 |
| Released | 2023-11-21 | 2026-03-03 |
| Weights | Proprietary | Proprietary |
| Context window | — | 128K |
| Max output | — | 16K |
| Input $ / M tokens | — | $1.75 |
| Output $ / M tokens | — | $14 |
| Results tracked | 7 | 18 |
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Category by category
Coding GPT-5.3 Chat leads
Claude 2.1: 26.2 (#327), GPT-5.3 Chat: 41.4 (#124)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| WeirdML | 7.1% | — |
| LMArena Coding | — | 1408 |
Reasoning GPT-5.3 Chat leads
Claude 2.1: 21.4 (#221), GPT-5.3 Chat: 28.5 (#102)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | — | 1399 |
| DTBench | 51% | — |
| Epoch Capabilities Index | 119.27 | — |
| ForecastBench | 54.2 | — |
Math GPT-5.3 Chat leads
Claude 2.1: 10.2 (#315), GPT-5.3 Chat: 38.2 (#142)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | — |
| LMArena Math | — | 1389 |
Knowledge GPT-5.3 Chat leads
Claude 2.1: 15.4 (#292), GPT-5.3 Chat: 38.8 (#140)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| GPQA Diamond | 33% | — |
| LMArena Expert | — | 1397 |
| MMLU | 73.5% | — |
Multilingual Not comparable
Claude 2.1: —, GPT-5.3 Chat: 50.3 (#124)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | — | 1382 |
| LMArena Chinese | — | 1432 |
| LMArena French | — | 1397 |
| LMArena German | — | 1384 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1346 |
| LMArena Russian | — | 1400 |
| LMArena Spanish | — | 1371 |
Instruction Following Not comparable
Claude 2.1: —, GPT-5.3 Chat: 72.8 (#129)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | — | 1378 |
Long Context Not comparable
Claude 2.1: —, GPT-5.3 Chat: 42.6 (#120)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | — | 1396 |
Writing & Preference Not comparable
Claude 2.1: —, GPT-5.3 Chat: 63.1 (#68)
| Benchmark | Claude 2.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | — | 1389 |
| LMArena Creative Writing | — | 1355 |
| EQ-Bench Creative Writing | — | 1690 |
| LMArena Multi-Turn | — | 1412 |
Frequently asked questions
Is Claude 2.1 better than GPT-5.3 Chat?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 25.2 on the Noometry Index.
Is Claude 2.1 or GPT-5.3 Chat better for coding?
GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 26.2 in the Noometry coding category.
How many benchmarks do Claude 2.1 and GPT-5.3 Chat share?
0 benchmarks have published results for both models. Claude 2.1 has 7 scored results on Noometry and GPT-5.3 Chat has 18.