How we'd choose between the brand-new OpenAI and Anthropic models
Today, both OpenAI and Anthropic released new, significantly improved models: GPT-5.3 Codex and Opus 4.6. We've been testing them thoroughly internally on real production use cases, and we've come to a conclusion: The models are converging. Opus 4.6 has all of the things we love about 4.5, but with the thorough, precise style that made Codex the go-to for hard-coding tasks. And Codex 5.3 is still a powerful workhorse, but it finally picked up some of Opus's warmth, speed, and willingness to just do things without asking permission. From this, we can only conclude that both labs are moving steadily toward a sort of Ur-coding model: one that's wicked smart, highly technical, and fast, creative, and pleasant to work with. Our top-line takeaways of how the two stack up against each other is available to anyone, with a full analysis available only for subscribers. Read the Vibe Check Here's what you'll find in the full Vib...