Model comparison
Kimi K2 (Jul 2025) vs Mercury
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 37.6 on the Noometry Index.
Last verified . 9 shared benchmarks.
Summary
- They share 9 benchmarks with published results for both. Kimi K2 (Jul 2025) scores higher in 6 categories and Mercury in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2 (Jul 2025) leads 62.3 to 46.2.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 64.4% for Kimi K2 (Jul 2025) and 21.6% for Mercury.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| Kimi K2 (Jul 2025) | Mercury | |
|---|---|---|
| Provider | Moonshot AI | Inception |
| Noometry Index | 41.2 | 37.6 |
| Released | 2025-07-12 | — |
| Weights | Open | Proprietary |
| Context window | 262K | — |
| Max output | 262K | — |
| Input $ / M tokens | $0.57 | — |
| Output $ / M tokens | $2.30 | — |
| Results tracked | 42 | 9 |
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Category by category
Coding Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 42.4 (#102), Mercury: 38.7 (#170)
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| LMArena Coding | 1399 | 1322 |
| SWE-bench Verified (bash only) | 63.4% | — |
| Aider Polyglot | 59.1% | — |
| GSO | 4.9% | — |
| WeirdML | 42.8% | — |
| ALE-Bench | 597.5 | — |
Agentic & Tool Use Not comparable
Kimi K2 (Jul 2025): 32.4 (#64), Mercury: —
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| Terminal-Bench | 35.7% | — |
| Berkeley Function Calling Leaderboard | 59.1% | — |
| METR Time Horizons | 59.2% | — |
Reasoning Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 23.3 (#179), Mercury: 17.5 (#293)
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| Kagi LLM Benchmark | 64.4% | 21.6% |
| LMArena Hard Prompts | 1384 | 1285 |
| SimpleBench | 26.3% | — |
| Epoch Capabilities Index | 146.01 | — |
| ForecastBench | 60.2 | — |
Math Not comparable
Kimi K2 (Jul 2025): 42.7 (#83), Mercury: —
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| Omni-MATH | 65.4% | — |
| LMArena Math | 1397 | — |
| FrontierMath (Feb 2025 set) | 21.4% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Not comparable
Kimi K2 (Jul 2025): 37.3 (#157), Mercury: —
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| MMLU-Pro | 81.9% | — |
| Confabulations | 20.4% | — |
| Vectara Hallucination Rate | 17.9% | — |
| GPQA (HELM) | 65.3% | — |
| LMArena Expert | 1365 | — |
Multilingual Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 49.6 (#130), Mercury: 41.6 (#206)
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| LMArena Non-English | 1372 | 1260 |
| LMArena Chinese | 1415 | — |
| LMArena French | 1379 | — |
| LMArena German | 1387 | — |
| LMArena Japanese | 1349 | — |
| LMArena Korean | 1325 | — |
| LMArena Russian | 1385 | — |
| LMArena Spanish | 1386 | — |
Instruction Following Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 71.1 (#156), Mercury: 65.2 (#224)
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| LMArena Instruction Following | 1348 | 1239 |
| IFEval | 85% | — |
Long Context Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 41.2 (#145), Mercury: 38.4 (#198)
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| LMArena Longer Query | 1353 | 1266 |
| Fiction.LiveBench | 66.7% | — |
| CL-bench | 17.6% | — |
Writing & Preference Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 62.3 (#78), Mercury: 46.2 (#221)
| Benchmark | Kimi K2 (Jul 2025) | Mercury |
|---|---|---|
| LMArena Text | 1380 | 1282 |
| LMArena Creative Writing | 1350 | 1191 |
| LMArena Multi-Turn | 1371 | 1282 |
| Short-Story Creative Writing | 85.6% | — |
| EQ-Bench Creative Writing | 1666 | — |
| WildBench | 86.2% | — |
Frequently asked questions
Is Kimi K2 (Jul 2025) better than Mercury?
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 37.6 on the Noometry Index.
Is Kimi K2 (Jul 2025) or Mercury better for coding?
Kimi K2 (Jul 2025) scores higher on coding benchmarks: 42.4 versus 38.7 in the Noometry coding category.
How many benchmarks do Kimi K2 (Jul 2025) and Mercury share?
9 benchmarks have published results for both models. Kimi K2 (Jul 2025) has 42 scored results on Noometry and Mercury has 9.