Model comparison
Kimi K2.5 Instant vs Mercury 2.5
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 33.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where Kimi K2.5 Instant leads 39.4 to 23.3.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 Instant | Mercury 2.5 | |
|---|---|---|
| Provider | Moonshot AI | Inception |
| Noometry Index | 43.6 | 33.5 |
| Released | — | 2026-09-08 |
| Weights | Open | Proprietary |
| Context window | — | 260K |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.04 |
| Output $ / M tokens | — | $0.15 |
| Results tracked | 18 | 4 |
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Category by category
Coding Kimi K2.5 Instant leads
Kimi K2.5 Instant: 42.6 (#97), Mercury 2.5: 39.5 (#156)
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| LMArena WebDev | 1404 | — |
| SciCode | — | 38.5% |
| LMArena Coding | 1484 | — |
| ALE-Bench | — | 301.65 |
Reasoning Kimi K2.5 Instant leads
Kimi K2.5 Instant: 29.7 (#90), Mercury 2.5: 22.4 (#193)
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| CritPt | — | 0% |
| LMArena Hard Prompts | 1443 | — |
Math Kimi K2.5 Instant leads
Kimi K2.5 Instant: 39.4 (#105), Mercury 2.5: 23.3 (#272)
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| ProofBench | — | 3% |
| LMArena Math | 1442 | — |
Knowledge Not comparable
Kimi K2.5 Instant: 40.2 (#123), Mercury 2.5: —
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| LMArena Expert | 1440 | — |
Multimodal Not comparable
Kimi K2.5 Instant: 40.2 (#50), Mercury 2.5: —
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| LMArena Vision | 1254 | — |
Multilingual Not comparable
Kimi K2.5 Instant: 52.0 (#94), Mercury 2.5: —
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1406 | — |
| LMArena Chinese | 1449 | — |
| LMArena French | 1403 | — |
| LMArena German | 1413 | — |
| LMArena Korean | 1378 | — |
| LMArena Russian | 1404 | — |
| LMArena Spanish | 1447 | — |
Instruction Following Not comparable
Kimi K2.5 Instant: 75.3 (#65), Mercury 2.5: —
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| LMArena Instruction Following | 1430 | — |
Long Context Not comparable
Kimi K2.5 Instant: 43.9 (#83), Mercury 2.5: —
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| LMArena Longer Query | 1435 | — |
Writing & Preference Not comparable
Kimi K2.5 Instant: 60.6 (#95), Mercury 2.5: —
| Benchmark | Kimi K2.5 Instant | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1420 | — |
| LMArena Creative Writing | 1381 | — |
| LMArena Multi-Turn | 1427 | — |
Frequently asked questions
Is Kimi K2.5 Instant better than Mercury 2.5?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 33.5 on the Noometry Index.
Is Kimi K2.5 Instant or Mercury 2.5 better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 39.5 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and Mercury 2.5 share?
0 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Mercury 2.5 has 4.