Want local vibe coding? This AI stack replaces Claude Code and Codex - and it's free ...
GPT-5.3 Codex merges the advanced coding capabilities of GPT-5.2 Codex with the reasoning and professional knowledge of GPT-5 ...
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ChatGPT

Class-leading features and responses ...
I tried a Claude Code alternative that's local, open source, and completely free - how it works ...
Oh, sure, I can “code.” That is, I can flail my way through a block of (relatively simple) pseudocode and follow the flow. I ...
GPT-5.3-Codex is the first time the ChatGPT maker has found that its own models can be instrumental in its own development.