Model comparison
GPT-5.3 Chat vs Kimi K2 Thinking Turbo
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 42.8 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 2 categories and Kimi K2 Thinking Turbo in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Kimi K2 Thinking Turbo leads 50.9 to 38.8.
- Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Chat | Kimi K2 Thinking Turbo | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 42.8 | 45.8 |
| Released | 2026-03-03 | 2025-11-06 |
| Weights | Proprietary | Open |
| Context window | 128K | — |
| Max output | 16K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 18 | 21 |
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Category by category
Coding GPT-5.3 Chat leads
GPT-5.3 Chat: 41.4 (#124), Kimi K2 Thinking Turbo: 38.4 (#178)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Coding | 1408 | 1454 |
| LMArena WebDev | — | 1322 |
Reasoning Kimi K2 Thinking Turbo leads
GPT-5.3 Chat: 28.5 (#102), Kimi K2 Thinking Turbo: 32.5 (#75)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1428 |
| Chess Puzzles | — | 20% |
Math Kimi K2 Thinking Turbo leads
GPT-5.3 Chat: 38.2 (#142), Kimi K2 Thinking Turbo: 47.4 (#68)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Math | 1389 | 1429 |
| OTIS Mock AIME 2024-2025 | — | 83.1% |
Knowledge Kimi K2 Thinking Turbo leads
GPT-5.3 Chat: 38.8 (#140), Kimi K2 Thinking Turbo: 50.9 (#69)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Expert | 1397 | 1439 |
| GPQA Diamond | — | 84.2% |
Multilingual Kimi K2 Thinking Turbo leads
GPT-5.3 Chat: 50.3 (#124), Kimi K2 Thinking Turbo: 51.4 (#109)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Non-English | 1382 | 1398 |
| LMArena Chinese | 1432 | 1456 |
| LMArena French | 1397 | 1425 |
| LMArena German | 1384 | 1390 |
| LMArena Japanese | 1352 | 1357 |
| LMArena Korean | 1346 | 1330 |
| LMArena Russian | 1400 | 1391 |
| LMArena Spanish | 1371 | 1406 |
Instruction Following Kimi K2 Thinking Turbo leads
GPT-5.3 Chat: 72.8 (#129), Kimi K2 Thinking Turbo: 74.0 (#109)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Instruction Following | 1378 | 1403 |
Long Context Too close to call
GPT-5.3 Chat: 42.6 (#120), Kimi K2 Thinking Turbo: 43.2 (#102)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Longer Query | 1396 | 1415 |
Writing & Preference GPT-5.3 Chat leads
GPT-5.3 Chat: 63.1 (#68), Kimi K2 Thinking Turbo: 60.0 (#104)
| Benchmark | GPT-5.3 Chat | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Text | 1389 | 1415 |
| LMArena Creative Writing | 1355 | 1374 |
| LMArena Multi-Turn | 1412 | 1414 |
| EQ-Bench Creative Writing | 1690 | — |
Frequently asked questions
Is GPT-5.3 Chat better than Kimi K2 Thinking Turbo?
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 42.8 on the Noometry Index.
Is GPT-5.3 Chat or Kimi K2 Thinking Turbo better for coding?
GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 38.4 in the Noometry coding category.
How many benchmarks do GPT-5.3 Chat and Kimi K2 Thinking Turbo share?
17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Kimi K2 Thinking Turbo has 21.