Model comparison
GPT-5.3 Codex vs Kimi K2 Thinking Turbo
GPT-5.3 Codex and Kimi K2 Thinking Turbo score almost the same on the Noometry Index (45.8 vs 45.8), so choose on price, context window or the category you care about most.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and Kimi K2 Thinking Turbo in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 38.4.
- Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | Kimi K2 Thinking Turbo | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 45.8 | 45.8 |
| Released | 2026-02-05 | 2025-11-06 |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 8 | 21 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.6 (#56), Kimi K2 Thinking Turbo: 38.4 (#178)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena WebDev | 1409 | 1322 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1454 |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), Kimi K2 Thinking Turbo: —
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Kimi K2 Thinking Turbo: 32.5 (#75)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| Chess Puzzles | — | 20% |
| LMArena Hard Prompts | — | 1428 |
| Epoch Capabilities Index | 156.77 | — |
Math Not comparable
GPT-5.3 Codex: —, Kimi K2 Thinking Turbo: 47.4 (#68)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 83.1% |
| LMArena Math | — | 1429 |
Knowledge Not comparable
GPT-5.3 Codex: —, Kimi K2 Thinking Turbo: 50.9 (#69)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| GPQA Diamond | — | 84.2% |
| LMArena Expert | — | 1439 |
Multilingual Not comparable
GPT-5.3 Codex: —, Kimi K2 Thinking Turbo: 51.4 (#109)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Non-English | — | 1398 |
| LMArena Chinese | — | 1456 |
| LMArena French | — | 1425 |
| LMArena German | — | 1390 |
| LMArena Japanese | — | 1357 |
| LMArena Korean | — | 1330 |
| LMArena Russian | — | 1391 |
| LMArena Spanish | — | 1406 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Kimi K2 Thinking Turbo: 74.0 (#109)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Instruction Following | — | 1403 |
Long Context Not comparable
GPT-5.3 Codex: —, Kimi K2 Thinking Turbo: 43.2 (#102)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Longer Query | — | 1415 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Kimi K2 Thinking Turbo: 60.0 (#104)
| Benchmark | GPT-5.3 Codex | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Text | — | 1415 |
| LMArena Creative Writing | — | 1374 |
| LMArena Multi-Turn | — | 1414 |
Frequently asked questions
Is GPT-5.3 Codex better than Kimi K2 Thinking Turbo?
GPT-5.3 Codex and Kimi K2 Thinking Turbo score almost the same on the Noometry Index (45.8 vs 45.8), so choose on price, context window or the category you care about most.
Is GPT-5.3 Codex or Kimi K2 Thinking Turbo better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 38.4 in the Noometry coding category.
How many benchmarks do GPT-5.3 Codex and Kimi K2 Thinking Turbo share?
1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Kimi K2 Thinking Turbo has 21.