Thais Castello Branco(@thaiscbranco_):opus 5.5 vs. fable 5.1 same prompt, all in javascript, navigating through y2k, age of empires, bauhaus, and more styles opus showed better 3D, physics, smoother transitions, interpretation of style, and added sound effects. congrats, epic model @claudeai!

Thais Castello Branco

@thaiscbranco_

ceo @tastelabs | on a mission to end AI slop | prev founding team @ExaAILabs

Joined October 2022

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Thais Castello Branco@thaiscbranco_

2026.09.23 21:22

opus 5.5 vs. fable 5.1 same prompt, all in javascript, navigating through y2k, age of empires, bauhaus, and more styles opus showed better 3D, physics, smoother transitions, interpretation of style, and added sound effects. congrats, epic model @claudeai!

Claude@claudeai

2026.09.22 16:31

Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.