Model comparison
Kimi K2.5 Instant vs Step 3
Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 39.9 on the Noometry Index.
Last verified . 16 shared benchmarks.
StepFunSummary
- They share 16 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 9 categories and Step 3 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2.5 Instant leads 60.8 to 54.5.
Side by side
| Kimi K2.5 Instant | Step 3 | |
|---|---|---|
| Provider | Moonshot AI | StepFun |
| Noometry Index | 42.9 | 39.9 |
| Released | — | — |
| Weights | Open | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 18 | 17 |
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Category by category
Coding Kimi K2.5 Instant leads
Kimi K2.5 Instant: 42.3 (#95), Step 3: 39.5 (#144)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Coding | 1483 | 1367 |
| LMArena WebDev | 1404 | — |
Reasoning Too close to call
Kimi K2.5 Instant: 28.5 (#88), Step 3: 27.6 (#102)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1355 |
| Kagi LLM Benchmark | — | 62.3% |
Math Kimi K2.5 Instant leads
Kimi K2.5 Instant: 36.6 (#105), Step 3: 34.9 (#148)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Math | 1443 | 1366 |
Knowledge Kimi K2.5 Instant leads
Kimi K2.5 Instant: 39.5 (#121), Step 3: 36.2 (#161)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Expert | 1438 | 1333 |
Multimodal Kimi K2.5 Instant leads
Kimi K2.5 Instant: 39.5 (#47), Step 3: 34.9 (#81)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Vision | 1254 | 1176 |
Multilingual Kimi K2.5 Instant leads
Kimi K2.5 Instant: 52.2 (#89), Step 3: 46.5 (#154)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Non-English | 1406 | 1327 |
| LMArena Chinese | 1450 | 1396 |
| LMArena German | 1413 | 1371 |
| LMArena Korean | 1378 | 1271 |
| LMArena Russian | 1404 | 1331 |
| LMArena Spanish | 1448 | 1372 |
| LMArena French | 1403 | — |
Instruction Following Kimi K2.5 Instant leads
Kimi K2.5 Instant: 75.5 (#61), Step 3: 70.6 (#159)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1332 |
Long Context Kimi K2.5 Instant leads
Kimi K2.5 Instant: 43.8 (#82), Step 3: 40.3 (#152)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Longer Query | 1435 | 1326 |
Writing & Preference Kimi K2.5 Instant leads
Kimi K2.5 Instant: 60.8 (#91), Step 3: 54.5 (#146)
| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Text | 1420 | 1351 |
| LMArena Creative Writing | 1379 | 1322 |
| LMArena Multi-Turn | 1427 | 1340 |
Frequently asked questions
Is Kimi K2.5 Instant better than Step 3?
Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 39.9 on the Noometry Index.
Is Kimi K2.5 Instant or Step 3 better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.3 versus 39.5 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and Step 3 share?
16 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Step 3 has 17.