Model comparison
Kimi K2.5 Instant vs Step 2 16k Exp 202412
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.2 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 8 categories and Step 2 16k Exp 202412 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2.5 Instant leads 60.6 to 52.3.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 Instant | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Moonshot AI | StepFun |
| Noometry Index | 43.6 | 39.2 |
| Released | — | — |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 18 | 12 |
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Category by category
Coding Kimi K2.5 Instant leads
Kimi K2.5 Instant: 42.6 (#97), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1484 | 1316 |
| LMArena WebDev | 1404 | — |
Reasoning Kimi K2.5 Instant leads
Kimi K2.5 Instant: 29.7 (#90), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1299 |
Math Kimi K2.5 Instant leads
Kimi K2.5 Instant: 39.4 (#105), Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1442 | 1304 |
Knowledge Kimi K2.5 Instant leads
Kimi K2.5 Instant: 40.2 (#123), Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1440 | 1279 |
Multimodal Not comparable
Kimi K2.5 Instant: 40.2 (#50), Step 2 16k Exp 202412: —
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1254 | — |
Multilingual Kimi K2.5 Instant leads
Kimi K2.5 Instant: 52.0 (#94), Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1406 | 1290 |
| LMArena Chinese | 1449 | 1331 |
| LMArena Russian | 1404 | 1324 |
| LMArena French | 1403 | — |
| LMArena German | 1413 | — |
| LMArena Korean | 1378 | — |
| LMArena Spanish | 1447 | — |
Instruction Following Kimi K2.5 Instant leads
Kimi K2.5 Instant: 75.3 (#65), Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1287 |
Long Context Kimi K2.5 Instant leads
Kimi K2.5 Instant: 43.9 (#83), Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1435 | 1307 |
Writing & Preference Kimi K2.5 Instant leads
Kimi K2.5 Instant: 60.6 (#95), Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | Kimi K2.5 Instant | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1420 | 1321 |
| LMArena Creative Writing | 1381 | 1328 |
| LMArena Multi-Turn | 1427 | 1292 |
Frequently asked questions
Is Kimi K2.5 Instant better than Step 2 16k Exp 202412?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.2 on the Noometry Index.
Is Kimi K2.5 Instant or Step 2 16k Exp 202412 better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 38.5 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Step 2 16k Exp 202412 has 12.