Model comparison
GPT-5 Mini vs Kimi K2.5 Instant
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 41.8 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GPT-5 Mini scores higher in 3 categories and Kimi K2.5 Instant in 6 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5 Mini leads 46.7 to 39.4.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| GPT-5 Mini | Kimi K2.5 Instant | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 41.8 | 43.6 |
| Released | 2025-08-07 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.25 | — |
| Output $ / M tokens | $2 | — |
| Results tracked | 60 | 18 |
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Category by category
Coding Kimi K2.5 Instant leads
GPT-5 Mini: 40.1 (#146), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Coding | 1406 | 1484 |
| SWE-bench Verified | 64.7% | — |
| SWE-bench Verified (bash only) | 59.8% | — |
| LMArena WebDev | — | 1404 |
| SWE-bench Multilingual | 39.7% | — |
| SciCode | 39.2% | — |
| WeirdML | 52.7% | — |
| ALE-Bench | 799.77 | — |
| AlgoTune | 1.38 | — |
Agentic & Tool Use Not comparable
GPT-5 Mini: 31.1 (#70), Kimi K2.5 Instant: —
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| Terminal-Bench | 34.8% | — |
| Berkeley Function Calling Leaderboard | 55.5% | — |
| Vending-Bench 2 | -31.18 | — |
Reasoning Kimi K2.5 Instant leads
GPT-5 Mini: 23.9 (#168), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1380 | 1443 |
| ARC-AGI-2 | 4.4% | — |
| Kagi LLM Benchmark | 70.3% | — |
| ARC-AGI-1 | 54.3% | — |
| CritPt | 0% | — |
| Chess Puzzles | 30% | — |
| EnigmaEval | 8.2% | — |
| Mystery Game Puzzles | 10% | — |
| DTBench | 80.5% | — |
| LMCA | 34.2% | — |
| Epoch Capabilities Index | 145.52 | — |
| ForecastBench | 61 | — |
Math GPT-5 Mini leads
GPT-5 Mini: 46.7 (#69), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1378 | 1442 |
| FrontierMath (Tiers 1-3) | 46.7% | — |
| FrontierMath Tier 4 | 12.2% | — |
| OTIS Mock AIME 2024-2025 | 86.7% | — |
| ProofBench | 9% | — |
| Omni-MATH | 72.2% | — |
| MATH Level 5 | 97.8% | — |
| FrontierMath (Feb 2025 set) | 27.2% | — |
| FrontierMath Tier 4 (v1) | 6.3% | — |
Knowledge GPT-5 Mini leads
GPT-5 Mini: 45.6 (#86), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1379 | 1440 |
| GPQA Diamond | 75% | — |
| Humanity's Last Exam | 19.4% | — |
| SimpleQA Verified | 21.6% | — |
| MMLU-Pro | 83.5% | — |
| Confabulations | 13.3% | — |
| Vectara Hallucination Rate | 12.9% | — |
| GPQA (HELM) | 75.6% | — |
Multimodal Kimi K2.5 Instant leads
GPT-5 Mini: 35.6 (#85), Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1202 | 1254 |
| VPCT | 40.2% | — |
Multilingual Kimi K2.5 Instant leads
GPT-5 Mini: 48.9 (#137), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1363 | 1406 |
| LMArena Chinese | 1385 | 1449 |
| LMArena French | 1386 | 1403 |
| LMArena German | 1366 | 1413 |
| LMArena Korean | 1308 | 1378 |
| LMArena Russian | 1362 | 1404 |
| LMArena Spanish | 1355 | 1447 |
| LMArena Japanese | 1341 | — |
Instruction Following Too close to call
GPT-5 Mini: 76.2 (#46), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1357 | 1430 |
| IFEval | 92.7% | — |
Long Context Kimi K2.5 Instant leads
GPT-5 Mini: 41.9 (#132), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1355 | 1435 |
| Fiction.LiveBench | 69.4% | — |
Writing & Preference Kimi K2.5 Instant leads
GPT-5 Mini: 55.2 (#148), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | GPT-5 Mini | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1373 | 1420 |
| LMArena Creative Writing | 1325 | 1381 |
| LMArena Multi-Turn | 1363 | 1427 |
| Short-Story Creative Writing | 83.1% | — |
| EQ-Bench Creative Writing | 1313 | — |
| WildBench | 85.5% | — |
Frequently asked questions
Is GPT-5 Mini better than Kimi K2.5 Instant?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 41.8 on the Noometry Index.
Is GPT-5 Mini or Kimi K2.5 Instant better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 40.1 in the Noometry coding category.
How many benchmarks do GPT-5 Mini and Kimi K2.5 Instant share?
17 benchmarks have published results for both models. GPT-5 Mini has 60 scored results on Noometry and Kimi K2.5 Instant has 18.