Model comparison
GPT-4.1 mini vs Kimi K2.5
Kimi K2.5 is the stronger model overall, scoring 47.8 to 33.5 on the Noometry Index.
Last verified . 33 shared benchmarks.
Summary
- They share 33 benchmarks with published results for both. GPT-4.1 mini scores higher in 0 categories and Kimi K2.5 in 10 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.5 leads 50.3 to 23.1.
- The biggest single-benchmark swing is ARC-AGI-1: 3.5% for GPT-4.1 mini and 65.3% for Kimi K2.5.
- GPT-4.1 mini is cheaper at $0.40 / $1.60 per million input/output tokens, against $0.45 / $2.25 for Kimi K2.5.
- GPT-4.1 mini accepts more context: 1.05M tokens versus 262K.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| GPT-4.1 mini | Kimi K2.5 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 33.5 | 47.8 |
| Released | 2025-04-14 | 2026-01-27 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 33K | 262K |
| Input $ / M tokens | $0.40 | $0.45 |
| Output $ / M tokens | $1.60 | $2.25 |
| Results tracked | 47 | 51 |
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Category by category
Coding Kimi K2.5 leads
GPT-4.1 mini: 30.4 (#286), Kimi K2.5: 48.7 (#48)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| SWE-bench Verified (bash only) | 23.9% | 70.8% |
| SciCode | 40.4% | 49% |
| WeirdML | 37.6% | 45.6% |
| LMArena Coding | 1367 | 1474 |
| SWE-bench Verified | — | 73.8% |
| Aider Polyglot | 32.4% | — |
| LMArena WebDev | — | 1436 |
| SWE-bench Multilingual | — | 67.3% |
| BigCodeBench Instruct | 48.9% | — |
| CadEval | 16% | — |
| ALE-Bench | — | 821.65 |
Agentic & Tool Use Too close to call
GPT-4.1 mini: 33.0 (#52), Kimi K2.5: 34.0 (#44)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| Berkeley Function Calling Leaderboard | 50.5% | — |
| OSWorld | — | 63.3% |
| Vending-Bench 2 | — | 1,198 |
Reasoning Kimi K2.5 leads
GPT-4.1 mini: 10.9 (#335), Kimi K2.5: 31.2 (#74)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| ARC-AGI-2 | 0% | 11.8% |
| Kagi LLM Benchmark | 48.6% | 78.5% |
| ARC-AGI-1 | 3.5% | 65.3% |
| CritPt | 0% | 3.1% |
| Chess Puzzles | 7% | 12% |
| LMArena Hard Prompts | 1349 | 1454 |
| Epoch Capabilities Index | 135.01 | 148.05 |
| SimpleBench | — | 46.8% |
| NYT Connections (extended) | — | 69.9% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| Mystery Game Puzzles | 7% | — |
| DTBench | 68.8% | — |
| LMCA | 21.1% | — |
Math Kimi K2.5 leads
GPT-4.1 mini: 23.1 (#264), Kimi K2.5: 50.3 (#46)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 44.7% | 92.2% |
| LMArena Math | 1343 | 1470 |
| FrontierMath (Feb 2025 set) | 4.5% | 27.9% |
| FrontierMath (Tiers 1-3) | 6.7% | — |
| MathArena Final-Answer Competitions | — | 62.3% |
| Omni-MATH | 49.1% | — |
| MATH Level 5 | 87.3% | — |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Kimi K2.5 leads
GPT-4.1 mini: 34.7 (#183), Kimi K2.5: 53.6 (#52)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| GPQA Diamond | 65.8% | 87.6% |
| SimpleQA Verified | 12.7% | 34.3% |
| LMArena Expert | 1338 | 1466 |
| Humanity's Last Exam | — | 24.4% |
| MMLU-Pro | 78.3% | — |
| Vectara Hallucination Rate | — | 14.2% |
| GPQA (HELM) | 61.4% | — |
Multimodal Kimi K2.5 leads
GPT-4.1 mini: 35.2 (#77), Kimi K2.5: 40.4 (#37)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| LMArena Vision | 1181 | 1269 |
| LMArena Document | — | 1430 |
Multilingual Kimi K2.5 leads
GPT-4.1 mini: 45.9 (#161), Kimi K2.5: 54.1 (#50)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | 1318 | 1433 |
| LMArena Chinese | 1329 | 1495 |
| LMArena French | 1357 | 1454 |
| LMArena German | 1349 | 1441 |
| LMArena Japanese | 1291 | 1422 |
| LMArena Korean | 1298 | 1412 |
| LMArena Russian | 1324 | 1436 |
| LMArena Spanish | 1319 | 1450 |
Instruction Following Kimi K2.5 leads
GPT-4.1 mini: 73.9 (#113), Kimi K2.5: 75.5 (#60)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | 1332 | 1431 |
| IFEval | 90.4% | — |
Long Context Kimi K2.5 leads
GPT-4.1 mini: 31.8 (#270), Kimi K2.5: 52.1 (#7)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| Fiction.LiveBench | 44.4% | 86.1% |
| LMArena Longer Query | 1344 | 1445 |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
Writing & Preference Kimi K2.5 leads
GPT-4.1 mini: 48.8 (#193), Kimi K2.5: 65.3 (#51)
| Benchmark | GPT-4.1 mini | Kimi K2.5 |
|---|---|---|
| LMArena Text | 1341 | 1445 |
| LMArena Creative Writing | 1300 | 1423 |
| EQ-Bench Creative Writing | 1147 | 1579 |
| LMArena Multi-Turn | 1354 | 1444 |
| WildBench | 83.8% | — |
Frequently asked questions
Is GPT-4.1 mini better than Kimi K2.5?
Kimi K2.5 is the stronger model overall, scoring 47.8 to 33.5 on the Noometry Index.
Which is cheaper, GPT-4.1 mini or Kimi K2.5?
GPT-4.1 mini is cheaper. It lists at $0.40 per million input tokens and $1.60 per million output tokens; Kimi K2.5 lists at $0.45 and $2.25.
Is GPT-4.1 mini or Kimi K2.5 better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.7 versus 30.4 in the Noometry coding category.
Which has the bigger context window?
GPT-4.1 mini does, with 1.05M tokens against 262K.
How many benchmarks do GPT-4.1 mini and Kimi K2.5 share?
33 benchmarks have published results for both models. GPT-4.1 mini has 47 scored results on Noometry and Kimi K2.5 has 51.