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  5. GPT-6 AstravsRiverflow V2 Fast
Updated Sep 2026

GPT-6 AstravsRiverflow V2 Fast

GPT-6 Astra has a larger context window than Riverflow V2 Fast (1.1M tokens vs 8K tokens).

GPT-6 Astra and Riverflow V2 Fast compared across 2 shared prompts
SpecGPT-6 AstraRiverflow V2 Fast
Input price$10/M tokens—
Output price$50/M tokens—
Context window1.1M tokens8K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Feb 2026
Our Verdict
GPT-6 Astra
GPT-6 Astra
Riverflow V2 Fast
Riverflow V2 FastRunner-up

Not enough votes to call it. On the specs, GPT-6 Astra has the edge: bigger model tier, newer, bigger context window, major provider backing.

Slight edge
API pricing

Cost per 1M tokens

GPT-6 Astra
Input
$10.00
Output
$50.00
Riverflow V2 Fast
Input
—
Output
—
Where to run it

3 hosts

GPT-6 Astra2 hosts
HostInOutContextUptime
Azure AI Foundry$10.00 in·$50.00 out·1.1M·100% upOpenAI$10.00 in·$50.00 out·1.1M·100% up
Riverflow V2 Fast1 host
HostInOutContextUptime
SSourceful$0 in·$0 out·8k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-6 Astra is developed by OpenAI while Riverflow V2 Fast is developed by Sourceful. GPT-6 Astra has a 1.1M 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.

It depends on your use case. GPT-6 Astra 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.

This page shows a side-by-side comparison of GPT-6 Astra 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.

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Model pages

GPT-6 Astra logo
GPT-6 Astra58 outputs, specs and price
Riverflow V2 Fast logo
Riverflow V2 Fast2 outputs, specs and price
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