GPT-5 (Thinking) tops the Web Dev @lmarena_ai
, winning ~65% of matchups and losing ~20%. This benchmark focuses on front-end development, fairly simple apps, so it is not representative of all coding. But OpenAI have made huge strides in front-end, given that their previous best
GENERATIVE AI
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GPT-5 Thinking dominates web development benchmarks with 65% win rate
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OpenAI Codex CLI Tool Built on Deprecated Model
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Oh no! It uses the "Codex CLI" unofficial name we've been assigning to the http://
GitHub.com/openai/codex tool AND it's called that because it was written against the old (and now long departed) Codex model -
GPT-5 offers improved user experience without existential concerns
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I'm really enjoying GPT-5. A much better product experience that doesn't feel like it wants to kill me or take my job any more than previous models did.
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GitHub Copilot brand confusion versus OpenAI Codex
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And to be fair Codex has nothing on Microsoft/GitHub Copilot when it comes to massive brand confusion these days
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Runway Releases Aleph Features and Gen-4 Image Turbo API
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New Aleph features and mobile updates, Gen-4 Image Turbo comes to the API and another community showcase. Get caught up on what happened This Week with Runway. pic.twitter.com/MoORcvL6cz
— Runway (@runwayml) 10 août 2025New Aleph features and mobile updates, Gen-4 Image Turbo comes to the API and another community showcase. Get caught up on what happened This Week with Runway.
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OpenAI Codex: Complete Collection of References
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Here's my full collection of things they've called Codex https://
simonwillison.net/2025/May/16/op
enai-codex/
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AI Asks Computer to Enhance: Blade Runner Meme Twist
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The enhance meme from Bladerunner, except the AI is asking the computer to enhance.
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Codex Asynchronous Coding Agent Web Application Launch
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… which is somewhat ironic given Sam tweeted this the day before they released the Codex asynchronous coding agent web application (the CLI tool had been out for a month by that point)
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GPT-4o’s Affectionate Capabilities Resonate With Users
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C’est un bon résumé GPT 4o était vraiment affectueux Il me manque