Hy3 vs 
Riverflow V2 Fast
Hy3 has a larger context window than Riverflow V2 Fast (262K tokens vs 8K tokens).
Written rounds
2 promptsBuy-side IC memo on a fictional SaaS company. Valuation, then the diligence questions.
Five-year LBO on a fictional HVAC business. Returns first, then the sensitivities.
Price and specs
Not enough votes to call it. On the specs, Hy3 has the edge: bigger model tier, newer, bigger context window.
| Spec | Hy3 | Riverflow V2 Fast |
|---|---|---|
| Input price | $0.132/M tokens | — |
| Output price | $0.528/M tokens | — |
| Context window | 262K tokens | 8K tokens |
| Weights | Open | — |
| Free API (OpenRouter) | No | No |
| Released | Jul 2026 | Feb 2026 |
| At 10M a month | $1.32 | not listed |
Input tokens at list price. No caching, no batch discount.
Where to run it
Riverflow V2 Fast1 host
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between Hy3 and Riverflow V2 Fast?
Hy3 is developed by Tencent while Riverflow V2 Fast is developed by Sourceful. Hy3 has a 262K token context window vs Riverflow V2 Fast's 8K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.
Which is better, Hy3 or Riverflow V2 Fast?
It depends on your use case. Hy3 and Riverflow V2 Fast each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.
How can I compare Hy3 and Riverflow V2 Fast on Rival?
This page shows a side-by-side comparison of Hy3 and Riverflow V2 Fast across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.
More comparisons
Against the newest arrivals
- Hy3 vs Step 5 PreviewLanded Oct 2026
- Riverflow V2 Fast vs Claude Haiku 5.5Landed Oct 2026
- Hy3 vs Ling 3.1 FlashLanded Oct 2026
- Riverflow V2 Fast vs Mistral Large 4Landed Oct 2026
- Hy3 vs GPT-6.1 SolLanded Sep 2026
- Riverflow V2 Fast vs Claude Sonnet 5.5Landed Sep 2026
- Hy3 vs Solar Mini 4Landed Sep 2026
- Riverflow V2 Fast vs Qwen3.8 Max PrimeLanded Sep 2026
Same lab, same size, long tail
- Hy3 vs Hy4 PreviewSame lab
- Hy3 vs Mistral Large 4Same size
- Riverflow V2 Fast vs Ox AlphaSame size
- Riverflow V2 Fast vs GPT-6.1 SolSame size
- Riverflow V2 Fast vs DeepSeek V4 Flash Vision ExpSame size
- Riverflow V2 Fast vs DeepSeek V4 ProNew provider
- Riverflow V2 Fast vs DeepSeek V4 Pro 0813New provider
- Riverflow V2 Fast vs DeepSeek V4.1 FlashSame size
