Kimi K3 vs 
Riverflow V2 Fast
Kimi K3 has a larger context window than Riverflow V2 Fast (1.0M 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, Kimi K3 has the edge: bigger model tier, newer, bigger context window.
| Spec | Kimi K3 | Riverflow V2 Fast |
|---|---|---|
| Input price | $3/M tokens | — |
| Output price | $15/M tokens | — |
| Context window | 1.0M tokens | 8K tokens |
| Weights | Open | — |
| Free API (OpenRouter) | No | No |
| Released | Jul 2026 | Feb 2026 |
| At 10M a month | $30.00 | not listed |
Input tokens at list price. No caching, no batch discount.
Where to run it
Kimi K320 hosts
- Wafer$0.60 in$15.00 out1M100% up
- InferenceNetfp4$0.80 in$13.50 out1M100% up
- Sail Researchfp4$0.84 in$13.50 out1M99.9% up
- AkashMLfp4$1.20 in$14.00 out1M97.6% up
- Morphfp8$1.30 in$14.00 out1M99.8% up
- Makorafp4$1.53 in$12.75 out1M99.6% up
14 more hostsFewer hosts
- Relacefp4$2.00 in$14.00 out1M100% up
- Decartmxfp4$2.55 in$12.75 out1M96.9% up
- Phala$2.55 in$12.75 out1M99.4% up
- DigitalOcean$2.55 in$12.95 out1M100% up
- Parasailfp4$2.60 in$13.00 out1M100% up
- Together$2.70 in$13.50 out1M98.1% up
- DeepInframxfp4$2.85 in$14.25 out1M100% up
- Amazon Bedrock$3.00 in$15.00 out1M98.3% up
- Basetenfp8$3.00 in$15.00 out1M100% up
- Chutesmxfp4$3.00 in$15.00 out1M90.9% up
- Fireworks$3.00 in$15.00 out1M100% up
- Modalmxfp4$3.00 in$15.00 out1M100% up
- Moonshot AImxfp4$3.00 in$15.00 out1M100% up
- Alibaba Cloud$3.45 in$17.25 out1M100% up
Riverflow V2 Fast1 host
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between Kimi K3 and Riverflow V2 Fast?
Kimi K3 is developed by Moonshot AI while Riverflow V2 Fast is developed by Sourceful. Kimi K3 has a 1.0M 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, Kimi K3 or Riverflow V2 Fast?
It depends on your use case. Kimi K3 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 Kimi K3 and Riverflow V2 Fast on Rival?
This page shows a side-by-side comparison of Kimi K3 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
- Kimi K3 vs Step 5 PreviewLanded Oct 2026
- Riverflow V2 Fast vs Claude Haiku 5.5Landed Oct 2026
- Kimi K3 vs Ling 3.1 FlashLanded Oct 2026
- Riverflow V2 Fast vs Mistral Large 4Landed Oct 2026
- Kimi K3 vs GPT-6.1 SolLanded Sep 2026
- Riverflow V2 Fast vs Claude Sonnet 5.5Landed Sep 2026
- Kimi K3 vs Solar Mini 4Landed Sep 2026
- Riverflow V2 Fast vs Qwen3.8 Max PrimeLanded Sep 2026
Same lab, same size, long tail
- Kimi K3 vs Kimi K2.7 CodeSame lab
- Kimi K3 vs Kimi K2Same lab
- Riverflow V2 Fast vs Ox AlphaSame size
- Riverflow V2 Fast vs GPT-6.1 SolSame size
- Kimi K3 vs Qwen3 235B A22B Thinking 2507Same size
- Kimi K3 vs Qwen3 30B A3BNew provider
- Kimi K3 vs Qwen3 30B A3B Instruct 2507New provider
- Kimi K3 vs Qwen3 30B A3B Thinking 2507New provider
