Model comparison
Hy4 preview vs Kimi K2.5
Kimi K2.5 is the stronger model overall, scoring 48.1 to 45.3 on the Noometry Index.
Last verified . 2 shared benchmarks.
TencentSummary
- They share 2 benchmarks with published results for both. Hy4 preview scores higher in 3 categories and Kimi K2.5 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy4 preview leads 55.7 to 51.8.
- Kimi K2.5 is cheaper at $0.45 / $2.25 per million input/output tokens, against $0.75 / $2.25 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 262K.
Side by side
| Hy4 preview | Kimi K2.5 | |
|---|---|---|
| Provider | Tencent | Moonshot AI |
| Noometry Index | 45.3 | 48.1 |
| Released | 2026-08-28 | 2026-01-27 |
| Weights | Open | Open |
| Context window | 1.05M | 262K |
| Max output | 64K | 262K |
| Input $ / M tokens | $0.75 | $0.45 |
| Output $ / M tokens | $2.25 | $2.25 |
| Results tracked | 3 | 51 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.6 (#38), Kimi K2.5: 48.8 (#53)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena WebDev | 1632 | 1437 |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 70.8% |
| SWE-bench Multilingual | — | 67.3% |
| SciCode | — | 49% |
| WeirdML | — | 45.6% |
| LMArena Coding | — | 1474 |
| ALE-Bench | — | 821.65 |
Agentic & Tool Use Not comparable
Hy4 preview: —, Kimi K2.5: 34.2 (#48)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| OSWorld | — | 63.3% |
| Vending-Bench 2 | — | 1,198 |
Reasoning Too close to call
Hy4 preview: 31.9 (#79), Kimi K2.5: 31.2 (#80)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| NYT Connections (extended) | 68.2% | 69.9% |
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 78.5% |
| ARC-AGI-1 | — | 65.3% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| LMArena Hard Prompts | — | 1453 |
| Epoch Capabilities Index | — | 148.03 |
Math Hy4 preview leads
Hy4 preview: 55.7 (#42), Kimi K2.5: 51.8 (#53)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| MathArena Final-Answer Competitions | — | 62.3% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| ProofBench | 75% | — |
| LMArena Math | — | 1470 |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Not comparable
Hy4 preview: —, Kimi K2.5: 53.6 (#56)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Vectara Hallucination Rate | — | 14.2% |
| LMArena Expert | — | 1466 |
Multimodal Not comparable
Hy4 preview: —, Kimi K2.5: 41.1 (#39)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Vision | — | 1269 |
| LMArena Document | — | 1430 |
Multilingual Not comparable
Hy4 preview: —, Kimi K2.5: 53.9 (#53)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | — | 1433 |
| LMArena Chinese | — | 1495 |
| LMArena French | — | 1454 |
| LMArena German | — | 1441 |
| LMArena Japanese | — | 1421 |
| LMArena Korean | — | 1410 |
| LMArena Russian | — | 1435 |
| LMArena Spanish | — | 1450 |
Instruction Following Not comparable
Hy4 preview: —, Kimi K2.5: 75.3 (#64)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | — | 1431 |
Long Context Not comparable
Hy4 preview: —, Kimi K2.5: 52.1 (#7)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
| LMArena Longer Query | — | 1445 |
Writing & Preference Not comparable
Hy4 preview: —, Kimi K2.5: 65.1 (#53)
| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Text | — | 1445 |
| LMArena Creative Writing | — | 1423 |
| EQ-Bench Creative Writing | — | 1579 |
| LMArena Multi-Turn | — | 1444 |
Frequently asked questions
Is Hy4 preview better than Kimi K2.5?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 45.3 on the Noometry Index.
Which is cheaper, Hy4 preview or Kimi K2.5?
Kimi K2.5 is cheaper. It lists at $0.45 per million input tokens and $2.25 per million output tokens; Hy4 preview lists at $0.75 and $2.25.
Is Hy4 preview or Kimi K2.5 better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 48.8 in the Noometry coding category.
Which has the bigger context window?
Hy4 preview does, with 1.05M tokens against 262K.
How many benchmarks do Hy4 preview and Kimi K2.5 share?
2 benchmarks have published results for both models. Hy4 preview has 3 scored results on Noometry and Kimi K2.5 has 51.