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Codex Build Arena
See what more Codex thinking actually buys you
Codex Build Arena is an open, visual benchmark of complete apps produced from the exact same one-shot prompt and starter repository. Compare GPT-5.6 Luna, Terra, and Sol across effort levels through live builds, side-by-side previews, engineering reviews, token usage, credits, duration, and source size. No cherry-picking, follow-up prompts, or hidden repairs. Use the results and decide which model and effort earned the cost.
Hey Product Hunt 👋
On my first day using Codex, I had a basic problem: I could choose a model and an effort level, but I could not see what those choices actually bought me. I was mostly hoping that newer meant better and more effort meant better work.
So I built Codex Build Arena.
Every captured run receives the same one-shot product brief, the same clean starter repo, the same tools, and no follow-up guidance. The final app is published as a live interactive build, together with its tokens, estimated credits, duration, source size, and a frozen engineering review.
The current arena includes GPT-5.6 Luna, Terra, and Sol, plus GPT-5.5, across Light, Medium, High, and Extra High effort. You can explore one build, compare two full screen, or analyze quality against cost.
A few things surprised me:
• More effort did not automatically produce a better result.
• The most expensive run was not always the strongest.
• Some lower-cost configurations were excellent starting points.
• One output could use fewer total tokens while producing more finished source.
The project is open source and all benchmark outputs are committed so anyone can inspect the evidence. I would love to know: which build would you keep, and what should the next one-prompt benchmark test?
Built in public with Codex.
About Codex Build Arena on Product Hunt
“See what more Codex thinking actually buys you”
Codex Build Arena was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #30 on the daily leaderboard. Codex Build Arena is an open, visual benchmark of complete apps produced from the exact same one-shot prompt and starter repository. Compare GPT-5.6 Luna, Terra, and Sol across effort levels through live builds, side-by-side previews, engineering reviews, token usage, credits, duration, and source size. No cherry-picking, follow-up prompts, or hidden repairs. Use the results and decide which model and effort earned the cost.
On the analytics side, Codex Build Arena competes within Open Source, Developer Tools, Artificial Intelligence, GitHub and OpenAI Day — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how Codex Build Arena performed against the three products that launched closest to it on the same day.
Who hunted Codex Build Arena?
Codex Build Arena was hunted by Özgür Celebi. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Codex Build Arena including community comment highlights and product details, visit the product overview.
Özgür Celebi