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[ARTICLE · art-55287] src=twitter.com ↗ pub= topic=large-language-models verified=true sentiment=↓ negative

GPT 5.6 Ultra better in Claude Code than in Codex?

Developer Theo reports that GPT-5.6 Ultra performs better in Anthropic's Claude Code than in OpenAI's Codex, expressing frustration over the discrepancy.

read1 min views1 publishedJul 11, 2026
GPT 5.6 Ultra better in Claude Code than in Codex?
Image: source

Theo - t3.gg @theo gpt-5.6-sol is meaningfully better in Claude Code than in Codex

I'm going to crash out so badly over this 2:58 AM · Jul 11, 2026 162K Views

source & further reading
twitter.com — original article
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