Model comparison
GPT-5.2 vs Kimi K2 (Jul 2025)
GPT-5.2 is the stronger model overall, scoring 54.1 to 41.2 on the Noometry Index. Kimi K2 (Jul 2025) costs 4.8× less per token, which makes it the better buy when GPT-5.2's lead doesn't matter for your workload.
Last verified . 33 shared benchmarks.
Summary
- They share 33 benchmarks with published results for both. GPT-5.2 scores higher in 9 categories and Kimi K2 (Jul 2025) in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.2 leads 50.2 to 23.3.
- The biggest single-benchmark swing is WeirdML: 72.2% for GPT-5.2 and 42.8% for Kimi K2 (Jul 2025).
- Kimi K2 (Jul 2025) is cheaper at $0.57 / $2.30 per million input/output tokens, against $1.75 / $14 for GPT-5.2.
- GPT-5.2 accepts more context: 400K tokens versus 262K.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| GPT-5.2 | Kimi K2 (Jul 2025) | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 54.1 | 41.2 |
| Released | 2025-12-11 | 2025-07-12 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $1.75 | $0.57 |
| Output $ / M tokens | $14 | $2.30 |
| Results tracked | 67 | 42 |
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Category by category
Coding GPT-5.2 leads
GPT-5.2: 51.6 (#37), Kimi K2 (Jul 2025): 42.4 (#102)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| SWE-bench Verified (bash only) | 72.8% | 63.4% |
| GSO | 27.4% | 4.9% |
| WeirdML | 72.2% | 42.8% |
| LMArena Coding | 1447 | 1399 |
| ALE-Bench | 1,294 | 597.5 |
| SWE-bench Verified | 73.8% | — |
| Aider Polyglot | — | 59.1% |
| LMArena WebDev | 1416 | — |
| SWE-bench Multilingual | 66.7% | — |
| AlgoTune | 2.05 | — |
Agentic & Tool Use GPT-5.2 leads
GPT-5.2: 40.2 (#24), Kimi K2 (Jul 2025): 32.4 (#64)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| Terminal-Bench | 64.9% | 35.7% |
| Berkeley Function Calling Leaderboard | 55.9% | 59.1% |
| METR Time Horizons | 75.3% | 59.2% |
| GDPval | 49.7% | — |
| Remote Labor Index | 2.5% | — |
| τ²-bench Airline | 83% | — |
| τ²-bench Banking | 32.2% | — |
| τ²-bench Retail | 81.6% | — |
| τ²-bench Telecom | 89.7% | — |
| DeepResearch Bench | 41.1% | — |
| LMArena Search | 1207 | — |
| Vending-Bench 2 | 3,591 | — |
Reasoning GPT-5.2 leads
GPT-5.2: 50.2 (#35), Kimi K2 (Jul 2025): 23.3 (#179)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| SimpleBench | 45.8% | 26.3% |
| Kagi LLM Benchmark | 73.3% | 64.4% |
| LMArena Hard Prompts | 1445 | 1384 |
| Epoch Capabilities Index | 153.45 | 146.01 |
| ForecastBench | 60.1 | 60.2 |
| ARC-AGI-2 | 52.9% | — |
| NYT Connections (extended) | 83.6% | — |
| ARC-AGI-1 | 86.2% | — |
| Chess Puzzles | 49% | — |
| EnigmaEval | 10.4% | — |
| EBR-Bench | 23% | — |
| Mystery Game Puzzles | 23% | — |
| DTBench | 90.9% | — |
| LMCA | 43.9% | — |
Math GPT-5.2 leads
GPT-5.2: 60.0 (#38), Kimi K2 (Jul 2025): 42.7 (#83)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Math | 1440 | 1397 |
| FrontierMath (Feb 2025 set) | 40.7% | 21.4% |
| FrontierMath Tier 4 (v1) | 18.8% | 0% |
| FrontierMath (Tiers 1-3) | 67.4% | — |
| FrontierMath Tier 4 | 31.7% | — |
| MathArena Final-Answer Competitions | 72% | — |
| OTIS Mock AIME 2024-2025 | 96.1% | — |
| ProofBench | 15% | — |
| Omni-MATH | — | 65.4% |
Knowledge GPT-5.2 leads
GPT-5.2: 59.3 (#32), Kimi K2 (Jul 2025): 37.3 (#157)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| Vectara Hallucination Rate | 8.4% | 17.9% |
| LMArena Expert | 1445 | 1365 |
| GPQA Diamond | 91.4% | — |
| Humanity's Last Exam | 27.8% | — |
| SimpleQA Verified | 37.1% | — |
| MMLU-Pro | — | 81.9% |
| Confabulations | — | 20.4% |
| GPQA (HELM) | — | 65.3% |
Multimodal Not comparable
GPT-5.2: 51.3 (#7), Kimi K2 (Jul 2025): —
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Vision | 1268 | — |
| VPCT | 84% | — |
| Furniture Assembly | 38.3% | — |
| LMArena Document | 1405 | — |
Multilingual GPT-5.2 leads
GPT-5.2: 53.4 (#67), Kimi K2 (Jul 2025): 49.6 (#130)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Non-English | 1425 | 1372 |
| LMArena Chinese | 1460 | 1415 |
| LMArena French | 1455 | 1379 |
| LMArena German | 1448 | 1387 |
| LMArena Japanese | 1420 | 1349 |
| LMArena Korean | 1392 | 1325 |
| LMArena Russian | 1440 | 1385 |
| LMArena Spanish | 1433 | 1386 |
Instruction Following GPT-5.2 leads
GPT-5.2: 74.7 (#89), Kimi K2 (Jul 2025): 71.1 (#156)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Instruction Following | 1417 | 1348 |
| IFEval | — | 85% |
Long Context GPT-5.2 leads
GPT-5.2: 44.0 (#78), Kimi K2 (Jul 2025): 41.2 (#145)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| CL-bench | 18.2% | 17.6% |
| LMArena Longer Query | 1428 | 1353 |
| Fiction.LiveBench | — | 66.7% |
Writing & Preference GPT-5.2 leads
GPT-5.2: 66.8 (#32), Kimi K2 (Jul 2025): 62.3 (#78)
| Benchmark | GPT-5.2 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Text | 1439 | 1380 |
| LMArena Creative Writing | 1401 | 1350 |
| EQ-Bench Creative Writing | 1703 | 1666 |
| LMArena Multi-Turn | 1458 | 1371 |
| Short-Story Creative Writing | — | 85.6% |
| WildBench | — | 86.2% |
Frequently asked questions
Is GPT-5.2 better than Kimi K2 (Jul 2025)?
GPT-5.2 is the stronger model overall, scoring 54.1 to 41.2 on the Noometry Index. Kimi K2 (Jul 2025) costs 4.8× less per token, which makes it the better buy when GPT-5.2's lead doesn't matter for your workload.
Which is cheaper, GPT-5.2 or Kimi K2 (Jul 2025)?
Kimi K2 (Jul 2025) is cheaper. It lists at $0.57 per million input tokens and $2.30 per million output tokens; GPT-5.2 lists at $1.75 and $14.
Is GPT-5.2 or Kimi K2 (Jul 2025) better for coding?
GPT-5.2 scores higher on coding benchmarks: 51.6 versus 42.4 in the Noometry coding category.
Which has the bigger context window?
GPT-5.2 does, with 400K tokens against 262K.
How many benchmarks do GPT-5.2 and Kimi K2 (Jul 2025) share?
33 benchmarks have published results for both models. GPT-5.2 has 67 scored results on Noometry and Kimi K2 (Jul 2025) has 42.