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  5. OpenAI Codex MinivsGPT-6 Luna
Updated Sep 2026

OpenAI Codex MinivsGPT-6 Luna

GPT-6 Luna is cheaper than OpenAI Codex Mini at $0.1/M vs $1.5/M input tokens.

OpenAI Codex Mini and GPT-6 Luna compared across 1 shared prompts
SpecOpenAI Codex MiniGPT-6 Luna
Input price$1.5/M tokens$0.1/M tokens
Output price$6/M tokens$0.5/M tokens
Context window200K tokens1.1M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMay 2025Sep 2026
Our Verdict
GPT-6 Luna
GPT-6 Luna
OpenAI Codex Mini
OpenAI Codex MiniRunner-up

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

GPT-6 Luna costs 12x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

OpenAI Codex Mini
Input
$1.50
Output
$6.00
GPT-6 Luna
Input
$0.10
15× cheaper
Output
$0.50
12× cheaper

GPT-6 Luna is cheaper on both: 15× input, 12× output.

Where to run it

3 hosts, cheapest first

OpenAI Codex Mini

No hosts listed on OpenRouter.

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

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

Research

What we learned reading every model

FAQ

Common questions

Both are developed by OpenAI but target different use cases. OpenAI Codex Mini has a 200K token context window vs GPT-6 Luna's 1.1M. You can compare their actual outputs across 1 challenges on Rival to see how they differ in practice.

It depends on your use case. OpenAI Codex Mini and GPT-6 Luna 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.

OpenAI Codex Mini costs $1.5/M input tokens and GPT-6 Luna costs $0.1/M input tokens. GPT-6 Luna is $1.40/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 OpenAI Codex Mini and GPT-6 Luna 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

OpenAI Codex Mini logo
OpenAI Codex Mini10 outputs, specs and price
GPT-6 Luna logo
GPT-6 Luna20 outputs, specs and price
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