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  5. GPT-6 LunavsGrok 3 Mini Beta
Updated Sep 2026

GPT-6 LunavsGrok 3 Mini Beta

GPT-6 Luna is cheaper than Grok 3 Mini Beta at $0.1/M vs $0.4/M input tokens.

GPT-6 Luna and Grok 3 Mini Beta compared across 5 shared prompts
SpecGPT-6 LunaGrok 3 Mini Beta
Input price$0.1/M tokens$0.4/M tokens
Output price$0.5/M tokens$0.8/M tokens
Context window1.1M tokens131K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Apr 2025
Our Verdict
GPT-6 Luna
GPT-6 Luna
Grok 3 Mini Beta
Grok 3 Mini BetaRunner-up

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

Slight edge
API pricing

Cost per 1M tokens

GPT-6 Luna
Input
$0.10
4.0× cheaper
Output
$0.50
1.6× cheaper
Grok 3 Mini Beta
Input
$0.40
Output
$0.80

GPT-6 Luna is cheaper on both: 4.0× input, 1.6× output.

Where to run it

3 hosts, cheapest first

GPT-6 Luna3 hosts
HostInOutContextUptime
Azure AI Foundry$0.10 in·$0.50 out·1.1M·88.4% upOpenAI$0.10 in·$0.50 out·1.1M·99.9% upAmazon Bedrock$0.11 in·$0.55 out·1.1M·99.8% up
Grok 3 Mini Beta

No hosts listed on OpenRouter.

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

Research

What we learned reading every model

FAQ

Common questions

GPT-6 Luna is developed by OpenAI while Grok 3 Mini Beta is developed by xAI. GPT-6 Luna has a 1.1M token context window vs Grok 3 Mini Beta's 131K. You can compare their actual outputs across 5 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-6 Luna and Grok 3 Mini Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 5 challenges so you can judge which fits your needs best.

GPT-6 Luna costs $0.1/M input tokens and Grok 3 Mini Beta costs $0.4/M input tokens. GPT-6 Luna is $0.30/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 Luna and Grok 3 Mini Beta 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

More comparisons

Against the newest arrivals

GPT-6 Luna logoSolar Mini 4 logo
GPT-6 Luna vs Solar Mini 4Landed Sep 2026
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GPT-6 Luna logoGLM 5.3 Prime logo
GPT-6 Luna vs GLM 5.3 PrimeLanded Sep 2026
Grok 3 Mini Beta logoQwen3.8 Omni Flash logo
Grok 3 Mini Beta vs Qwen3.8 Omni FlashLanded Sep 2026
GPT-6 Luna logoCommand A+ logo
GPT-6 Luna vs Command A+Landed Sep 2026
Grok 3 Mini Beta logoClaude Opus 5.5 logo
Grok 3 Mini Beta vs Claude Opus 5.5Landed Sep 2026
GPT-6 Luna logoGPT-6 Luna Pro logo
GPT-6 Luna vs GPT-6 Luna ProLanded Sep 2026
Grok 3 Mini Beta logoGPT-6 Sol Pro logo
Grok 3 Mini Beta vs GPT-6 Sol ProLanded Sep 2026

Same lab, same size, long tail

GPT-6 Luna logoGPT-6 Sol Pro logo
GPT-6 Luna vs GPT-6 Sol ProSame lab
GPT-6 Luna logoGPT-6 Sol logo
GPT-6 Luna vs GPT-6 SolSame lab
Grok 3 Mini Beta logoGrok 4.7 logo
Grok 3 Mini Beta vs Grok 4.7Same lab
Grok 3 Mini Beta logoGrok 4.6 logo
Grok 3 Mini Beta vs Grok 4.6Version compare
GPT-6 Luna logoGrok 4.20 Beta logo
GPT-6 Luna vs Grok 4.20 BetaCross-provider
GPT-6 Luna logoGrok 4.20 Multi-Agent Beta logo
GPT-6 Luna vs Grok 4.20 Multi-Agent BetaCross-provider
GPT-6 Luna logoGrok 4.3 logo
GPT-6 Luna vs Grok 4.3Same size
GPT-6 Luna logoGrok 4.5 logo
GPT-6 Luna vs Grok 4.5Same size

Model pages

GPT-6 Luna logo
GPT-6 Luna20 outputs, specs and price
Grok 3 Mini Beta logo
Grok 3 Mini Beta13 outputs, specs and price
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