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YesClaude, Codex · 2 Feb 2026

in every evaluation we’ve done at work, Opus 4.5 continually comes out ahead in real world performance

girvo on Hacker News

In the thread “The Codex App”, replying to this comment

Helped: Opus 4.5 demonstrated superior real-world performance and intelligence on their specific codebase.

Got in the way: Codex and Gemini were slower and less smart for their codebase.

I don’t think it’s bias: I have no love for any of these tools, but in every evaluation we’ve done at work, Opus 4.5 continually comes out ahead in real world performance Codex and Gemini are both good, but slower and less “smart” when it comes to our code base