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  5. Claude 3 SonnetvsGPT-6 Luna Pro
Updated Sep 2026

Claude 3 SonnetvsGPT-6 Luna Pro

GPT-6 Luna Pro is cheaper than Claude 3 Sonnet at $0.1/M vs $3/M input tokens.

Claude 3 Sonnet and GPT-6 Luna Pro compared across 1 shared prompts
SpecClaude 3 SonnetGPT-6 Luna Pro
Input price$3/M tokens$0.1/M tokens
Output price$15/M tokens$0.5/M tokens
Context window—1.1M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Sep 2026
Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
GPT-6 Luna Pro
GPT-6 Luna Pro

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

GPT-6 Luna Pro costs 30x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Sonnet
Input
$3.00
Output
$15.00
GPT-6 Luna Pro
Input
$0.10
30× cheaper
Output
$0.50
30× cheaper

GPT-6 Luna Pro is cheaper on both: 30× input, 30× output.

Where to run it

2 hosts

Claude 3 Sonnet

No hosts listed on OpenRouter.

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

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

Research

What we learned reading every model

FAQ

Common questions

Claude 3 Sonnet is developed by Anthropic while GPT-6 Luna Pro is developed by OpenAI. You can compare their actual outputs across 1 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Sonnet and GPT-6 Luna Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 1 challenges so you can judge which fits your needs best.

Claude 3 Sonnet costs $3/M input tokens and GPT-6 Luna Pro costs $0.1/M input tokens. GPT-6 Luna Pro is $2.90/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 Claude 3 Sonnet and GPT-6 Luna Pro 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

Claude 3 Sonnet logo
Claude 3 Sonnet13 outputs, specs and price
GPT-6 Luna Pro logo
GPT-6 Luna Pro20 outputs, specs and price
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