Claude Opus Model Selection

💬Community

Friday, January 23, 2026

Users are discussing unexpected model behavior and selection inconsistencies with Claude Code, particularly regarding Opus and Sonnet versions, and noting that Opus is now selectable for Claude Pro users.

4 tweets•4 engagements

@obieObie Fernandez

Anyone else notice some shenanigans with the model selection in Claude Code 2.1.17 ... all of a sudden I'm using Sonnet 4.5 even though all my sessions are always set to Opus??? C'mon #wtf cc: @bcherny

♥ 9

@richkuo7Rich Kuo

Learned this today claude --model opusplan Sets your entire Claude Code session to use opus for plan and sonnet for build

♥ 5

@Iron_AdamantIron_Adamant

That's something I'd love to know, because the usage on Opus has really dipped badly recently, and this was critical in some of my more complicated part of the project. I'm testing with Claude Code + GLM 4.7 for general work, then only now reverting to Opus 4.5 for debugs