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  5. GPT-6 Astra ProvsSolar Mini 4
Updated Sep 2026

GPT-6 Astra ProvsSolar Mini 4

Solar Mini 4 is cheaper than GPT-6 Astra Pro at $0.05/M vs $10/M input tokens.

GPT-6 Astra Pro and Solar Mini 4 compared across 2 shared prompts
SpecGPT-6 Astra ProSolar Mini 4
Input price$10/M tokens$0.05/M tokens
Output price$50/M tokens$0.2/M tokens
Context window1.1M tokens524K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Sep 2026
Our Verdict
GPT-6 Astra Pro
GPT-6 Astra Pro
Solar Mini 4
Solar Mini 4Runner-up

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

Solar Mini 4 costs 250x less per token.

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
Solar Mini 4
Input
$0.05
200× cheaper
Output
$0.20
250× cheaper

Solar Mini 4 is cheaper on both: 200× input, 250× output.

Where to run it

3 hosts

GPT-6 Astra Pro2 hosts
HostInOutContextUptime
Azure AI Foundry$10.00 in·$50.00 out·1.1M·100% upOpenAI$10.00 in·$50.00 out·1.1M·99.4% up
Solar Mini 41 host
HostInOutContextUptime
UUpstage$0.05 in·$0.20 out·524k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-6 Astra Pro is developed by OpenAI while Solar Mini 4 is developed by Upstage. GPT-6 Astra Pro has a 1.1M token context window vs Solar Mini 4's 524K. 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 Solar Mini 4 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 Solar Mini 4 costs $0.05/M input tokens. Solar Mini 4 is $9.95/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 Solar Mini 4 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.

Keep exploring

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Model pages

GPT-6 Astra Pro logo
GPT-6 Astra Pro6 outputs, specs and price
Solar Mini 4 logo
Solar Mini 419 outputs, specs and price
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