Model comparison
Kimi K2.7 Code vs Mercury 2
Kimi K2.7 Code is the stronger model overall, scoring 43.3 to 39.1 on the Noometry Index. Mercury 2 costs 4.6× less per token, which makes it the better buy when Kimi K2.7 Code's lead doesn't matter for your workload.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. Kimi K2.7 Code scores higher in 3 categories and Mercury 2 in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Kimi K2.7 Code leads 53.5 to 36.2.
- The biggest single-benchmark swing is WeirdML: 54.1% for Kimi K2.7 Code and 43.2% for Mercury 2.
- Mercury 2 is cheaper at $0.25 / $0.75 per million input/output tokens, against $0.95 / $4 for Kimi K2.7 Code.
- Kimi K2.7 Code accepts more context: 262K tokens versus 128K.
- Kimi K2.7 Code has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.7 Code | Mercury 2 | |
|---|---|---|
| Provider | Moonshot AI | Inception |
| Noometry Index | 43.3 | 39.1 |
| Released | 2026-06-12 | 2026-02-20 |
| Weights | Open | Proprietary |
| Context window | 262K | 128K |
| Max output | 262K | 50K |
| Input $ / M tokens | $0.95 | $0.25 |
| Output $ / M tokens | $4 | $0.75 |
| Results tracked | 19 | 17 |
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Category by category
Coding Kimi K2.7 Code leads
Kimi K2.7 Code: 42.9 (#95), Mercury 2: 33.5 (#255)
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| LMArena WebDev | 1473 | 1171 |
| SciCode | 47.5% | 38.7% |
| WeirdML | 54.1% | 43.2% |
| ALE-Bench | 886.23 | 785.58 |
| DeepSWE | 30.5% | — |
| FrontierCode | 30.1% | — |
| LMArena Coding | — | 1391 |
Agentic & Tool Use Not comparable
Kimi K2.7 Code: 24.0 (#122), Mercury 2: —
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| APEX-Agents | 37.6% | — |
| GBAEval | 0.9% | — |
| Vending-Bench 2 | 5,083 | — |
Reasoning Kimi K2.7 Code leads
Kimi K2.7 Code: 39.0 (#61), Mercury 2: 23.8 (#170)
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| CritPt | 10% | 0.8% |
| SimpleBench | 57.9% | — |
| Chess Puzzles | 21% | — |
| LMArena Hard Prompts | — | 1362 |
| Surface Evolver Bench | 48.8% | — |
| Epoch Capabilities Index | 149.97 | — |
Math Not comparable
Kimi K2.7 Code: 52.9 (#48), Mercury 2: —
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 54% | — |
| FrontierMath Tier 4 | 12.2% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
Knowledge Kimi K2.7 Code leads
Kimi K2.7 Code: 53.5 (#57), Mercury 2: 36.2 (#172)
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| GPQA Diamond | 87.9% | — |
| SimpleQA Verified | 36.5% | — |
| Vectara Hallucination Rate | — | 12.3% |
| LMArena Expert | — | 1358 |
Multilingual Not comparable
Kimi K2.7 Code: —, Mercury 2: 46.6 (#157)
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| LMArena Non-English | — | 1331 |
| LMArena Chinese | — | 1417 |
| LMArena Russian | — | 1304 |
Instruction Following Not comparable
Kimi K2.7 Code: —, Mercury 2: 70.2 (#165)
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | — | 1329 |
Long Context Not comparable
Kimi K2.7 Code: —, Mercury 2: 40.5 (#154)
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| LMArena Longer Query | — | 1330 |
Writing & Preference Not comparable
Kimi K2.7 Code: —, Mercury 2: 53.8 (#155)
| Benchmark | Kimi K2.7 Code | Mercury 2 |
|---|---|---|
| LMArena Text | — | 1355 |
| LMArena Creative Writing | — | 1289 |
| LMArena Multi-Turn | — | 1358 |
Frequently asked questions
Is Kimi K2.7 Code better than Mercury 2?
Kimi K2.7 Code is the stronger model overall, scoring 43.3 to 39.1 on the Noometry Index. Mercury 2 costs 4.6× less per token, which makes it the better buy when Kimi K2.7 Code's lead doesn't matter for your workload.
Which is cheaper, Kimi K2.7 Code or Mercury 2?
Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Kimi K2.7 Code lists at $0.95 and $4.
Is Kimi K2.7 Code or Mercury 2 better for coding?
Kimi K2.7 Code scores higher on coding benchmarks: 42.9 versus 33.5 in the Noometry coding category.
Which has the bigger context window?
Kimi K2.7 Code does, with 262K tokens against 128K.
How many benchmarks do Kimi K2.7 Code and Mercury 2 share?
5 benchmarks have published results for both models. Kimi K2.7 Code has 19 scored results on Noometry and Mercury 2 has 17.