Gemini 3.8 Flash vs Hy4 preview: Specs & Benchmark Comparison
Gemini 3.8 Flash is developed by Google, while Hy4 preview comes from Tencent. Hy4 preview was released in August 2026, and Gemini 3.8 Flash followed a month later in September 2026. Hy4 preview has a published size of about 770 billion parameters; Google has not disclosed the parameter count of Gemini 3.8 Flash.
The two models share 3 published benchmarks. Hy4 preview leads on 2 of them, Gemini 3.8 Flash on 1. The widest gaps are on BioMysteryBench, where Hy4 preview scores 71.3% against 56.5%; GDPval-AA, where Hy4 preview scores 55.9% against 51.5%. Averaged across everything we track, Gemini 3.8 Flash sits at 59.2% and Hy4 preview at 58.7%.
Gemini 3.8 Flash is available through an API at $0.75 per million input tokens with a 1M-token context window. We do not track a hosted API for Hy4 preview, so pricing and context cannot be compared directly.
| Characteristic | Gemini 3.8 Flash | Hy4 preview |
|---|---|---|
| Company | Tencent | |
| Release Date | September 2, 2026 | August 28, 2026 |
| Parameters | — | 770B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | — |
| Context (output) | 66K | — |
| Input Price / 1M | $0.75 | — |
| Output Price / 1M | $3.75 | — |
| Average Score | 59.2% | 58.7% |
| Benchmarks | ||
| BioMysteryBench | 56.5% | 71.3% |
| GDPval-AA | 51.5% | 55.9% |
| Terminal-Bench 2.1 | 89.4% | 85.4% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Gemini 3.8 Flash — 0.6, Hy4 preview — 0.6.
Both models were released around the same time: 9/2/2026 and 8/28/2026.
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Frequently Asked Questions
Which is better for coding — Gemini 3.8 Flash or Hy4 preview?
Which model is cheaper — Gemini 3.8 Flash or Hy4 preview?
Which has a larger context window — Gemini 3.8 Flash or Hy4 preview?
The Gemini 3.8 Flash and Hy4 preview comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Gemini 3.8 Flash or Hy4 preview page. See also the complete list of AI model comparisons.