Model comparison
Kimi K3 vs Mercury
Kimi K3 is the stronger model overall, scoring 59.5 to 37.6 on the Noometry Index.
Last verified . 8 shared benchmarks.
Summary
- They share 8 benchmarks with published results for both. Kimi K3 scores higher in 6 categories and Mercury in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K3 leads 63.0 to 17.5.
- Kimi K3 has downloadable open weights; the other is API-only.
Side by side
| Kimi K3 | Mercury | |
|---|---|---|
| Provider | Moonshot AI | Inception |
| Noometry Index | 59.5 | 37.6 |
| Released | 2026-07-16 | — |
| Weights | Open | Proprietary |
| Context window | 1.05M | — |
| Max output | 1.05M | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 53 | 9 |
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Category by category
Coding Kimi K3 leads
Kimi K3: 61.0 (#10), Mercury: 38.7 (#170)
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| LMArena Coding | 1508 | 1322 |
| DeepSWE | 68.5% | — |
| FrontierCode | 44.2% | — |
| LMArena WebDev | 1654 | — |
| FrontierSWE | 25.9% | — |
| SciCode | 59.5% | — |
| WeirdML | 82.6% | — |
| ALE-Bench | 1,524 | — |
Agentic & Tool Use Not comparable
Kimi K3: 41.8 (#20), Mercury: —
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| APEX-Agents | 50.6% | — |
| τ²-bench Banking | 37.1% | — |
| PostTrainBench | 32% | — |
| GBAEval | 48.3% | — |
| GDP.pdf | 19% | — |
| Vending-Bench 2 | 5,165 | — |
Reasoning Kimi K3 leads
Kimi K3: 63.0 (#17), Mercury: 17.5 (#293)
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| LMArena Hard Prompts | 1496 | 1285 |
| ARC-AGI-2 | 60.4% | — |
| SimpleBench | 60.7% | — |
| Kagi LLM Benchmark | — | 21.6% |
| NYT Connections (extended) | 93.6% | — |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 23.4% | — |
| Chess Puzzles | 39% | — |
| Mystery Game Puzzles | 26% | — |
| DTBench | 91.2% | — |
| LMCA | 52.7% | — |
| Surface Evolver Bench | 95% | — |
| Epoch Capabilities Index | 157.45 | — |
| ForecastBench | 61.1 | — |
Math Not comparable
Kimi K3: 74.2 (#16), Mercury: —
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| FrontierMath (Tiers 1-3) | 72.2% | — |
| FrontierMath Tier 4 | 39% | — |
| MathArena Final-Answer Competitions | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 97.2% | — |
| ProofBench | 87% | — |
| LMArena Math | 1491 | — |
Knowledge Not comparable
Kimi K3: 63.2 (#21), Mercury: —
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| GPQA Diamond | 93.1% | — |
| SimpleQA Verified | 50.6% | — |
| LMArena Expert | 1521 | — |
Multimodal Not comparable
Kimi K3: 37.8 (#70), Mercury: —
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| Blueprint-Bench 2 | 29.5% | — |
| Furniture Assembly | 34.2% | — |
Multilingual Kimi K3 leads
Kimi K3: 56.3 (#21), Mercury: 41.6 (#206)
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| LMArena Non-English | 1466 | 1260 |
| LMArena Chinese | 1529 | — |
| LMArena French | 1491 | — |
| LMArena German | 1488 | — |
| LMArena Japanese | 1487 | — |
| LMArena Korean | 1458 | — |
| LMArena Russian | 1482 | — |
| LMArena Spanish | 1472 | — |
Instruction Following Kimi K3 leads
Kimi K3: 77.7 (#14), Mercury: 65.2 (#224)
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| LMArena Instruction Following | 1483 | 1239 |
Long Context Kimi K3 leads
Kimi K3: 45.8 (#29), Mercury: 38.4 (#198)
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| LMArena Longer Query | 1494 | 1266 |
Writing & Preference Kimi K3 leads
Kimi K3: 76.6 (#4), Mercury: 46.2 (#221)
| Benchmark | Kimi K3 | Mercury |
|---|---|---|
| LMArena Text | 1476 | 1282 |
| LMArena Creative Writing | 1454 | 1191 |
| LMArena Multi-Turn | 1488 | 1282 |
| EQ-Bench Creative Writing | 2082 | — |
| EQ-Bench 4 | 1339 | — |
Frequently asked questions
Is Kimi K3 better than Mercury?
Kimi K3 is the stronger model overall, scoring 59.5 to 37.6 on the Noometry Index.
Is Kimi K3 or Mercury better for coding?
Kimi K3 scores higher on coding benchmarks: 61.0 versus 38.7 in the Noometry coding category.
How many benchmarks do Kimi K3 and Mercury share?
8 benchmarks have published results for both models. Kimi K3 has 53 scored results on Noometry and Mercury has 9.