Model comparison
GPT-4.1 vs Kimi K2.5 Instant
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 35.9 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GPT-4.1 scores higher in 0 categories and Kimi K2.5 Instant in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 29.7 to 11.7.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| GPT-4.1 | Kimi K2.5 Instant | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 35.9 | 43.6 |
| Released | 2025-04-14 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 33K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $8 | — |
| Results tracked | 52 | 18 |
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Category by category
Coding Kimi K2.5 Instant leads
GPT-4.1: 34.4 (#238), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Coding | 1391 | 1484 |
| SWE-bench Verified | 48.5% | — |
| SWE-bench Verified (bash only) | 39.6% | — |
| Aider Polyglot | 52.4% | — |
| LMArena WebDev | — | 1404 |
| WeirdML | 39% | — |
| CadEval | 42% | — |
| ALE-Bench | 558.1 | — |
Agentic & Tool Use Not comparable
GPT-4.1: 34.7 (#43), Kimi K2.5 Instant: —
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| Berkeley Function Calling Leaderboard | 54% | — |
Reasoning Kimi K2.5 Instant leads
GPT-4.1: 11.7 (#339), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1384 | 1443 |
| ARC-AGI-2 | 0.4% | — |
| SimpleBench | 27% | — |
| Kagi LLM Benchmark | 52.3% | — |
| ARC-AGI-1 | 5.5% | — |
| Chess Puzzles | 6% | — |
| EnigmaEval | 2.2% | — |
| DTBench | 68.3% | — |
| LMCA | 25.6% | — |
| Epoch Capabilities Index | 136.78 | — |
| ForecastBench | 61.5 | — |
Math Kimi K2.5 Instant leads
GPT-4.1: 22.3 (#280), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1370 | 1442 |
| FrontierMath (Tiers 1-3) | 6% | — |
| OTIS Mock AIME 2024-2025 | 38.3% | — |
| Omni-MATH | 47.1% | — |
| MATH Level 5 | 83% | — |
| FrontierMath (Feb 2025 set) | 5.5% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Kimi K2.5 Instant leads
GPT-4.1: 37.1 (#160), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1364 | 1440 |
| GPQA Diamond | 66.9% | — |
| Humanity's Last Exam | 5.4% | — |
| SimpleQA Verified | 31.1% | — |
| MMLU-Pro | 81.1% | — |
| Vectara Hallucination Rate | 5.6% | — |
| GPQA (HELM) | 65.9% | — |
Multimodal Kimi K2.5 Instant leads
GPT-4.1: 38.2 (#67), Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1211 | 1254 |
| GeoBench | 72% | — |
Multilingual Kimi K2.5 Instant leads
GPT-4.1: 49.4 (#133), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1370 | 1406 |
| LMArena Chinese | 1382 | 1449 |
| LMArena French | 1382 | 1403 |
| LMArena German | 1381 | 1413 |
| LMArena Korean | 1339 | 1378 |
| LMArena Russian | 1377 | 1404 |
| LMArena Spanish | 1376 | 1447 |
| LMArena Japanese | 1319 | — |
Instruction Following Kimi K2.5 Instant leads
GPT-4.1: 71.3 (#153), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1367 | 1430 |
| IFEval | 83.8% | — |
Long Context Kimi K2.5 Instant leads
GPT-4.1: 40.0 (#163), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1385 | 1435 |
| Fiction.LiveBench | 63.9% | — |
Writing & Preference Kimi K2.5 Instant leads
GPT-4.1: 57.6 (#125), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | GPT-4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1383 | 1420 |
| LMArena Creative Writing | 1363 | 1381 |
| LMArena Multi-Turn | 1398 | 1427 |
| EQ-Bench Creative Writing | 1420 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is GPT-4.1 better than Kimi K2.5 Instant?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 35.9 on the Noometry Index.
Is GPT-4.1 or Kimi K2.5 Instant better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 34.4 in the Noometry coding category.
How many benchmarks do GPT-4.1 and Kimi K2.5 Instant share?
17 benchmarks have published results for both models. GPT-4.1 has 52 scored results on Noometry and Kimi K2.5 Instant has 18.