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  5. GPT-6 Luna ProvsLlama 3.1 405B
Updated Sep 2026

GPT-6 Luna ProvsLlama 3.1 405B

GPT-6 Luna Pro is cheaper than Llama 3.1 405B at $0.1/M vs $2.7/M input tokens.

GPT-6 Luna Pro and Llama 3.1 405B compared across 5 shared prompts
SpecGPT-6 Luna ProLlama 3.1 405B
Input price$0.1/M tokens$2.7/M tokens
Output price$0.5/M tokens$3.1/M tokens
Context window1.1M tokens128K tokens
WeightsClosedOpen
Free API (OpenRouter)NoNo
ReleasedSep 2026Jul 2024
Our Verdict
GPT-6 Luna Pro
GPT-6 Luna Pro
Llama 3.1 405B
Llama 3.1 405B

Not enough votes to call it. On the specs, nothing separates them.

GPT-6 Luna Pro costs 6.2x less per token.

Too close to call
API pricing

Cost per 1M tokens

GPT-6 Luna Pro
Input
$0.10
27× cheaper
Output
$0.50
6.2× cheaper
Llama 3.1 405B
Input
$2.70
Output
$3.10

GPT-6 Luna Pro is cheaper on both: 27× input, 6.2× output.

Where to run it

2 hosts

GPT-6 Luna Pro2 hosts
HostInOutContextUptime
Azure AI Foundry$0.10 in·$0.50 out·1.1M·98.6% upOpenAI$0.10 in·$0.50 out·1.1M·99.9% up
Llama 3.1 405B

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 Pro is developed by OpenAI while Llama 3.1 405B is developed by Meta AI. GPT-6 Luna Pro has a 1.1M token context window vs Llama 3.1 405B's 128K. 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 Pro and Llama 3.1 405B 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 Pro costs $0.1/M input tokens and Llama 3.1 405B costs $2.7/M input tokens. GPT-6 Luna Pro is $2.60/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 Pro and Llama 3.1 405B 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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Same lab, same size, long tail

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Llama 3.1 405B vs Muse Glimmer 30BSame lab
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Llama 3.1 405B vs Muse Spark 1.3Same lab
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GPT-6 Luna Pro vs Mistral Devstral Small 1.1New provider
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Llama 3.1 405B vs Dots3-Note PreviewNew provider
GPT-6 Luna Pro logoElephant Alpha logo
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Model pages

GPT-6 Luna Pro logo
GPT-6 Luna Pro20 outputs, specs and price
Llama 3.1 405B logo
Llama 3.1 405B12 outputs, specs and price
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