Model comparison
Gemini 2.5 Flash vs Hy4 preview
Hy4 preview is the stronger model overall, scoring 45.3 to 39.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
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TencentSummary
- The widest gap is in coding, where Hy4 preview leads 51.6 to 35.8.
- Gemini 2.5 Flash is cheaper at $0.30 / $2.50 per million input/output tokens, against $0.75 / $2.25 for Hy4 preview.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| Gemini 2.5 Flash | Hy4 preview | |
|---|---|---|
| Provider | Tencent | |
| Noometry Index | 39.3 | 45.3 |
| Released | 2025-04-17 | 2026-08-28 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 1.05M |
| Max output | 66K | 64K |
| Input $ / M tokens | $0.30 | $0.75 |
| Output $ / M tokens | $2.50 | $2.25 |
| Results tracked | 54 | 3 |
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Category by category
Coding Hy4 preview leads
Gemini 2.5 Flash: 35.8 (#220), Hy4 preview: 51.6 (#38)
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| SWE-bench Verified (bash only) | 28.7% | — |
| Aider Polyglot | 55.1% | — |
| LMArena WebDev | — | 1632 |
| WeirdML | 41.9% | — |
| LMArena Coding | 1424 | — |
| ALE-Bench | 661.88 | — |
Agentic & Tool Use Not comparable
Gemini 2.5 Flash: 30.8 (#74), Hy4 preview: —
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| Terminal-Bench | 17.1% | — |
| Berkeley Function Calling Leaderboard | 56.2% | — |
| TheAgentCompany | 41.1% | — |
| BALROG | 33.5% | — |
| Vending-Bench 2 | 548.84 | — |
Reasoning Hy4 preview leads
Gemini 2.5 Flash: 18.1 (#286), Hy4 preview: 31.9 (#79)
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| ARC-AGI-2 | 2.5% | — |
| SimpleBench | 41.2% | — |
| Kagi LLM Benchmark | 56.8% | — |
| NYT Connections (extended) | — | 68.2% |
| ARC-AGI-1 | 33.3% | — |
| CritPt | 1.1% | — |
| EnigmaEval | 2.7% | — |
| LMArena Hard Prompts | 1422 | — |
| DTBench | 76.5% | — |
| LMCA | 27.5% | — |
| Epoch Capabilities Index | 143.03 | — |
| ForecastBench | 60.6 | — |
Math Hy4 preview leads
Gemini 2.5 Flash: 39.9 (#98), Hy4 preview: 55.7 (#42)
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 73.1% | — |
| ProofBench | — | 75% |
| Omni-MATH | 38.5% | — |
| LMArena Math | 1415 | — |
| FrontierMath (Feb 2025 set) | 4.8% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
Gemini 2.5 Flash: 36.4 (#168), Hy4 preview: —
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| Humanity's Last Exam | 12.1% | — |
| MMLU-Pro | 63.9% | — |
| Confabulations | 16.8% | — |
| Vectara Hallucination Rate | 7.8% | — |
| GPQA (HELM) | 39% | — |
| LMArena Expert | 1426 | — |
Multimodal Not comparable
Gemini 2.5 Flash: 41.8 (#32), Hy4 preview: —
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| LMArena Vision | 1253 | — |
| GeoBench | 76% | — |
| VPCT | 46.2% | — |
| SpatialViz-Bench | 36.9% | — |
Multilingual Not comparable
Gemini 2.5 Flash: 52.3 (#88), Hy4 preview: —
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1409 | — |
| LMArena Chinese | 1450 | — |
| LMArena French | 1433 | — |
| LMArena German | 1418 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1385 | — |
| LMArena Russian | 1415 | — |
| LMArena Spanish | 1421 | — |
Instruction Following Not comparable
Gemini 2.5 Flash: 75.7 (#54), Hy4 preview: —
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| IFEval | 89.8% | — |
| LMArena Instruction Following | 1405 | — |
Long Context Not comparable
Gemini 2.5 Flash: 47.5 (#17), Hy4 preview: —
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| Fiction.LiveBench | 77.8% | — |
| LMArena Longer Query | 1419 | — |
Writing & Preference Not comparable
Gemini 2.5 Flash: 53.8 (#157), Hy4 preview: —
| Benchmark | Gemini 2.5 Flash | Hy4 preview |
|---|---|---|
| LMArena Text | 1417 | — |
| LMArena Creative Writing | 1400 | — |
| Short-Story Creative Writing | 76.5% | — |
| EQ-Bench Creative Writing | 1137 | — |
| WildBench | 81.7% | — |
| LMArena Multi-Turn | 1408 | — |
Frequently asked questions
Is Gemini 2.5 Flash better than Hy4 preview?
Hy4 preview is the stronger model overall, scoring 45.3 to 39.3 on the Noometry Index.
Which is cheaper, Gemini 2.5 Flash or Hy4 preview?
Gemini 2.5 Flash is cheaper. It lists at $0.30 per million input tokens and $2.50 per million output tokens; Hy4 preview lists at $0.75 and $2.25.
Is Gemini 2.5 Flash or Hy4 preview better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 35.8 in the Noometry coding category.
Which has the bigger context window?
Both accept 1.05M tokens.
How many benchmarks do Gemini 2.5 Flash and Hy4 preview share?
0 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and Hy4 preview has 3.