Model comparison
Gemini 3.8 Flash vs Kimi K2.5 Instant
Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 43.6 on the Noometry Index.
Last verified . 18 shared benchmarks.
GoogleSummary
- They share 18 benchmarks with published results for both. Gemini 3.8 Flash scores higher in 9 categories and Kimi K2.5 Instant in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.8 Flash leads 76.9 to 29.7.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Gemini 3.8 Flash | Kimi K2.5 Instant | |
|---|---|---|
| Provider | Moonshot AI | |
| Noometry Index | 61.8 | 43.6 |
| Released | 2026-09-02 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.75 | — |
| Output $ / M tokens | $3.75 | — |
| Results tracked | 50 | 18 |
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Category by category
Coding Gemini 3.8 Flash leads
Gemini 3.8 Flash: 59.2 (#15), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena WebDev | 1584 | 1404 |
| LMArena Coding | 1510 | 1484 |
| DeepSWE | 73.8% | — |
| FrontierCode | 41.2% | — |
| CursorBench | 39.6% | — |
| FrontierSWE | 19.6% | — |
| SciCode | 56.6% | — |
| WeirdML | 84.8% | — |
| ALE-Bench | 1,270 | — |
Agentic & Tool Use Not comparable
Gemini 3.8 Flash: 41.8 (#21), Kimi K2.5 Instant: —
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| APEX-Agents | 64.3% | — |
| Remote Labor Index | 5.8% | — |
| GDP.pdf | 23.4% | — |
| Vending-Bench 2 | 5,094 | — |
Reasoning Gemini 3.8 Flash leads
Gemini 3.8 Flash: 76.9 (#5), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1508 | 1443 |
| ARC-AGI-2 | 89.2% | — |
| NYT Connections (extended) | 97.4% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 18.3% | — |
| Chess Puzzles | 61% | — |
| Mystery Game Puzzles | 47% | — |
| DTBench | 95.7% | — |
| LMCA | 52.9% | — |
| Surface Evolver Bench | 76.9% | — |
| Epoch Capabilities Index | 156.71 | — |
Math Gemini 3.8 Flash leads
Gemini 3.8 Flash: 65.3 (#28), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1528 | 1442 |
| FrontierMath (Tiers 1-3) | 68.4% | — |
| FrontierMath Tier 4 | 22% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| ProofBench | 48% | — |
Knowledge Gemini 3.8 Flash leads
Gemini 3.8 Flash: 74.8 (#2), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1524 | 1440 |
| GPQA Diamond | 95.4% | — |
| Humanity's Last Exam | 44.5% | — |
| SimpleQA Verified | 69.7% | — |
Multimodal Too close to call
Gemini 3.8 Flash: 40.7 (#45), Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1314 | 1254 |
| Blueprint-Bench 2 | 38.6% | — |
| Furniture Assembly | 31.7% | — |
Multilingual Gemini 3.8 Flash leads
Gemini 3.8 Flash: 58.0 (#5), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1491 | 1406 |
| LMArena Chinese | 1554 | 1449 |
| LMArena French | 1498 | 1403 |
| LMArena German | 1493 | 1413 |
| LMArena Korean | 1459 | 1378 |
| LMArena Russian | 1515 | 1404 |
| LMArena Spanish | 1485 | 1447 |
| LMArena Japanese | 1502 | — |
Instruction Following Gemini 3.8 Flash leads
Gemini 3.8 Flash: 78.0 (#13), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1490 | 1430 |
Long Context Gemini 3.8 Flash leads
Gemini 3.8 Flash: 46.3 (#24), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1508 | 1435 |
Writing & Preference Gemini 3.8 Flash leads
Gemini 3.8 Flash: 72.2 (#15), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | Gemini 3.8 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1499 | 1420 |
| LMArena Creative Writing | 1492 | 1381 |
| LMArena Multi-Turn | 1501 | 1427 |
| EQ-Bench Creative Writing | 1748 | — |
Frequently asked questions
Is Gemini 3.8 Flash better than Kimi K2.5 Instant?
Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 43.6 on the Noometry Index.
Is Gemini 3.8 Flash or Kimi K2.5 Instant better for coding?
Gemini 3.8 Flash scores higher on coding benchmarks: 59.2 versus 42.6 in the Noometry coding category.
How many benchmarks do Gemini 3.8 Flash and Kimi K2.5 Instant share?
18 benchmarks have published results for both models. Gemini 3.8 Flash has 50 scored results on Noometry and Kimi K2.5 Instant has 18.