Model comparison
Hy4 preview vs Kimi K2 (Jul 2025)
Hy4 preview is the stronger model overall, scoring 44.6 to 40.9 on the Noometry Index.
Last verified . 0 shared benchmarks.
TencentSummary
- The widest gap is in math, where Hy4 preview leads 54.5 to 40.1.
- Kimi K2 (Jul 2025) is cheaper at $0.57 / $2.30 per million input/output tokens, against $0.83 / $2.50 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 262K.
Side by side
| Hy4 preview | Kimi K2 (Jul 2025) | |
|---|---|---|
| Provider | Tencent | Moonshot AI |
| Noometry Index | 44.6 | 40.9 |
| Released | 2026-08-28 | 2025-07-12 |
| Weights | Open | Open |
| Context window | 1.05M | 262K |
| Max output | 64K | 262K |
| Input $ / M tokens | $0.83 | $0.57 |
| Output $ / M tokens | $2.50 | $2.30 |
| Results tracked | 3 | 42 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.4 (#36), Kimi K2 (Jul 2025): 43.1 (#83)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| SWE-bench Verified (bash only) | — | 63.4% |
| Aider Polyglot | — | 59.1% |
| LMArena WebDev | 1633 | — |
| GSO | — | 4.9% |
| WeirdML | — | 42.8% |
| LMArena Coding | — | 1399 |
| ALE-Bench | — | 597.5 |
Agentic & Tool Use Not comparable
Hy4 preview: —, Kimi K2 (Jul 2025): 32.2 (#59)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| Terminal-Bench | — | 35.7% |
| Berkeley Function Calling Leaderboard | — | 59.1% |
| METR Time Horizons | — | 59.2% |
Reasoning Hy4 preview leads
Hy4 preview: 30.6 (#75), Kimi K2 (Jul 2025): 22.7 (#173)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| SimpleBench | — | 26.3% |
| Kagi LLM Benchmark | — | 64.4% |
| NYT Connections (extended) | 68.2% | — |
| LMArena Hard Prompts | — | 1384 |
| Epoch Capabilities Index | — | 146.02 |
| ForecastBench | — | 60.2 |
Math Hy4 preview leads
Hy4 preview: 54.5 (#37), Kimi K2 (Jul 2025): 40.1 (#81)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| ProofBench | 75% | — |
| Omni-MATH | — | 65.4% |
| LMArena Math | — | 1396 |
| FrontierMath (Feb 2025 set) | — | 21.4% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Not comparable
Hy4 preview: —, Kimi K2 (Jul 2025): 36.9 (#153)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| MMLU-Pro | — | 81.9% |
| Confabulations | — | 20.4% |
| Vectara Hallucination Rate | — | 17.9% |
| GPQA (HELM) | — | 65.3% |
| LMArena Expert | — | 1363 |
Multilingual Not comparable
Hy4 preview: —, Kimi K2 (Jul 2025): 49.8 (#125)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Non-English | — | 1372 |
| LMArena Chinese | — | 1416 |
| LMArena French | — | 1379 |
| LMArena German | — | 1386 |
| LMArena Japanese | — | 1349 |
| LMArena Korean | — | 1324 |
| LMArena Russian | — | 1384 |
| LMArena Spanish | — | 1383 |
Instruction Following Not comparable
Hy4 preview: —, Kimi K2 (Jul 2025): 71.3 (#151)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| IFEval | — | 85% |
| LMArena Instruction Following | — | 1347 |
Long Context Not comparable
Hy4 preview: —, Kimi K2 (Jul 2025): 41.2 (#140)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| Fiction.LiveBench | — | 66.7% |
| CL-bench | — | 17.6% |
| LMArena Longer Query | — | 1353 |
Writing & Preference Not comparable
Hy4 preview: —, Kimi K2 (Jul 2025): 62.5 (#76)
| Benchmark | Hy4 preview | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Text | — | 1380 |
| LMArena Creative Writing | — | 1349 |
| Short-Story Creative Writing | — | 85.6% |
| EQ-Bench Creative Writing | — | 1666 |
| WildBench | — | 86.2% |
| LMArena Multi-Turn | — | 1371 |
Frequently asked questions
Is Hy4 preview better than Kimi K2 (Jul 2025)?
Hy4 preview is the stronger model overall, scoring 44.6 to 40.9 on the Noometry Index.
Which is cheaper, Hy4 preview or Kimi K2 (Jul 2025)?
Kimi K2 (Jul 2025) is cheaper. It lists at $0.57 per million input tokens and $2.30 per million output tokens; Hy4 preview lists at $0.83 and $2.50.
Is Hy4 preview or Kimi K2 (Jul 2025) better for coding?
Hy4 preview scores higher on coding benchmarks: 51.4 versus 43.1 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 (Jul 2025) share?
0 benchmarks have published results for both models. Hy4 preview has 3 scored results on Noometry and Kimi K2 (Jul 2025) has 42.