Grok 4.20 Multi-Agent Beta vs 
Riverflow V2 Fast
Grok 4.20 Multi-Agent Beta has a larger context window than Riverflow V2 Fast (2.0M 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, Grok 4.20 Multi-Agent Beta has the edge: bigger model tier, newer, bigger context window, major provider backing.
| Spec | Grok 4.20 Multi-Agent Beta | Riverflow V2 Fast |
|---|---|---|
| Input price | $2/M tokens | — |
| Output price | $6/M tokens | — |
| Context window | 2.0M tokens | 8K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Mar 2026 | Feb 2026 |
| At 10M a month | $20.00 | not listed |
Input tokens at list price. No caching, no batch discount.
Where to run it
Grok 4.20 Multi-Agent Beta1 host
Riverflow V2 Fast1 host
Per million tokens. Prices and uptime via OpenRouter, checked 11 Oct 2026.
Common questions
What is the difference between Grok 4.20 Multi-Agent Beta and Riverflow V2 Fast?
Grok 4.20 Multi-Agent Beta is developed by xAI while Riverflow V2 Fast is developed by Sourceful. Grok 4.20 Multi-Agent Beta has a 2.0M 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, Grok 4.20 Multi-Agent Beta or Riverflow V2 Fast?
It depends on your use case. Grok 4.20 Multi-Agent Beta 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 Grok 4.20 Multi-Agent Beta and Riverflow V2 Fast on Rival?
This page shows a side-by-side comparison of Grok 4.20 Multi-Agent Beta 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
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Same lab, same size, long tail
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