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Opus 5.5 Files a Ready-to-Merge PR for T3 Chat

Theo - t3.gg

@theo · 394.8K followers

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Sep 24, 2026

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Claude Opus 5.5 autonomously filed a pull request fixing paragraph-mode streaming behavior in T3 Chat — no hand-holding required. The PR includes a precise technical write-up: 31% of section titles in paragraph-mode were rendering alone with a median 1-second wait before content followed. The fix holds titles until their first content line ships with them. A before/after video demo is embedded directly in the PR. @theo sent a vague prompt; what came back was a production-ready, ready-to-merge diff.

Opus 5.5 diagnosed that 31% of paragraph-mode titles sat alone, with a median 1s wait and a worst case of 5.4s
The fix is server-only, so every client benefits automatically — no frontend changes needed
PR includes a before/after video demo, written entirely by the model from a single vague prompt

“Opus 5.5 just filed a pull request that changes the streaming behavior in T3 code. It's so cool that I can send off a prompt with a vague idea of what I want, and the result is a ready-to-merge pull request with a video demo of the changes directly in the PR. The PRs I make with AI are significantly better than the ones I used to make by hand. The future is awesome.”
— @theo

pull-request open-source autonomous-coding t3-chat streaming one-shot dark-mode minimal