How to switch Claude Code to Opus 5.5 and keep it selected
This story is from 2026-09-28. It is preserved in the archive; the latest stories are on the live feed.
You run /model , choose Opus, and Claude Code still uses another model—or it returns a 400 before the first response. The reliable fix is to separate three things: the model command, the Claude Code version, and any request-level fallback triggered by a refusal. Use the full model ID when you need…
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- 2026-09-28 06:18 · DEV Community — AI
How to switch Claude Code to Opus 5.5 and keep it selected