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  5. GPT-6 Astra ProvsLaguna S 2.1 (free)
Updated Sep 2026

GPT-6 Astra ProvsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than GPT-6 Astra Pro at $0/M vs $10/M input tokens.

GPT-6 Astra Pro and Laguna S 2.1 (free) compared across 2 shared prompts
SpecGPT-6 Astra ProLaguna S 2.1 (free)
Input price$10/M tokensFree
Output price$50/M tokensFree
Context window1.1M tokens262K tokens
WeightsClosed—
Free API (OpenRouter)NoYes (1 provider)
ReleasedSep 2026Jul 2026
Our Verdict
GPT-6 Astra Pro
GPT-6 Astra Pro
Laguna S 2.1 (free)
Laguna S 2.1 (free)Runner-up

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

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-6 Astra Pro
Input
$10.00
Output
$50.00
Laguna S 2.1 (free)
Input
$0.000
Output
$0.000
Where to run it

3 hosts

GPT-6 Astra Pro2 hosts
HostInOutContextUptime
Azure AI Foundry$10.00 in·$50.00 out·1.1M·99.4% upOpenAI$10.00 in·$50.00 out·1.1M·99.8% up
Laguna S 2.1 (free)1 host
HostInOutContextUptime
PPoolsidefp4$0 in·$0 out·262k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-6 Astra Pro is developed by OpenAI while Laguna S 2.1 (free) is developed by Poolside. GPT-6 Astra Pro has a 1.1M token context window vs Laguna S 2.1 (free)'s 262K. 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 Pro and Laguna S 2.1 (free) 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.

GPT-6 Astra Pro costs $10/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $10.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of GPT-6 Astra Pro and Laguna S 2.1 (free) 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

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GPT-6 Astra Pro6 outputs, specs and price
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