Model comparison
Kimi K2 Thinking Turbo vs Mercury 2
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 39.1 on the Noometry Index.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. Kimi K2 Thinking Turbo scores higher in 7 categories and Mercury 2 in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Kimi K2 Thinking Turbo leads 50.9 to 36.2.
- Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.
Side by side
| Kimi K2 Thinking Turbo | Mercury 2 | |
|---|---|---|
| Provider | Moonshot AI | Inception |
| Noometry Index | 45.8 | 39.1 |
| Released | 2025-11-06 | 2026-02-20 |
| Weights | Open | Proprietary |
| Context window | — | 128K |
| Max output | — | 50K |
| Input $ / M tokens | — | $0.25 |
| Output $ / M tokens | — | $0.75 |
| Results tracked | 21 | 17 |
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Category by category
Coding Kimi K2 Thinking Turbo leads
Kimi K2 Thinking Turbo: 38.4 (#178), Mercury 2: 33.5 (#255)
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| LMArena WebDev | 1322 | 1171 |
| LMArena Coding | 1454 | 1391 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| ALE-Bench | — | 785.58 |
Reasoning Kimi K2 Thinking Turbo leads
Kimi K2 Thinking Turbo: 32.5 (#75), Mercury 2: 23.8 (#170)
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1428 | 1362 |
| CritPt | — | 0.8% |
| Chess Puzzles | 20% | — |
Math Not comparable
Kimi K2 Thinking Turbo: 47.4 (#68), Mercury 2: —
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 83.1% | — |
| LMArena Math | 1429 | — |
Knowledge Kimi K2 Thinking Turbo leads
Kimi K2 Thinking Turbo: 50.9 (#69), Mercury 2: 36.2 (#172)
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| LMArena Expert | 1439 | 1358 |
| GPQA Diamond | 84.2% | — |
| Vectara Hallucination Rate | — | 12.3% |
Multilingual Kimi K2 Thinking Turbo leads
Kimi K2 Thinking Turbo: 51.4 (#109), Mercury 2: 46.6 (#157)
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1398 | 1331 |
| LMArena Chinese | 1456 | 1417 |
| LMArena Russian | 1391 | 1304 |
| LMArena French | 1425 | — |
| LMArena German | 1390 | — |
| LMArena Japanese | 1357 | — |
| LMArena Korean | 1330 | — |
| LMArena Spanish | 1406 | — |
Instruction Following Kimi K2 Thinking Turbo leads
Kimi K2 Thinking Turbo: 74.0 (#109), Mercury 2: 70.2 (#165)
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1329 |
Long Context Kimi K2 Thinking Turbo leads
Kimi K2 Thinking Turbo: 43.2 (#102), Mercury 2: 40.5 (#154)
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1415 | 1330 |
Writing & Preference Kimi K2 Thinking Turbo leads
Kimi K2 Thinking Turbo: 60.0 (#104), Mercury 2: 53.8 (#155)
| Benchmark | Kimi K2 Thinking Turbo | Mercury 2 |
|---|---|---|
| LMArena Text | 1415 | 1355 |
| LMArena Creative Writing | 1374 | 1289 |
| LMArena Multi-Turn | 1414 | 1358 |
Frequently asked questions
Is Kimi K2 Thinking Turbo better than Mercury 2?
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 39.1 on the Noometry Index.
Is Kimi K2 Thinking Turbo or Mercury 2 better for coding?
Kimi K2 Thinking Turbo scores higher on coding benchmarks: 38.4 versus 33.5 in the Noometry coding category.
How many benchmarks do Kimi K2 Thinking Turbo and Mercury 2 share?
12 benchmarks have published results for both models. Kimi K2 Thinking Turbo has 21 scored results on Noometry and Mercury 2 has 17.