[BUG] `opusplan` mode does uses Opus 4.1 instead of Opus 4.5
Status Fixed / completed
Maintainer reply ✓ Yes — dicksontsai
Activity 4 comments · opened Dec 1, 2025 · closed Dec 2, 2025
💡 Likely answer: A maintainer (dicksontsai, collaborator)
responded on this thread — see the highlighted reply below.
Preflight Checklist
- [x] I have searched existing issues and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code
What's Wrong?
When using opusplan mode (set via ~/.claude/settings.json) the Plan phase makes use of Opus 4.1, not the latest Opus 4.5.
What Should Happen?
opusplan should automatically make use of the latest available models in each phase (sonnet 4.5 for execution and opus 4.5 for planning as of posting).
Error Messages/Logs
Steps to Reproduce
- Set
opusplan(insettings.json) - Open Claude
- (Optional) Set a status line to see which model is being used
- Engage plan mode
Model will be set to Opus 4.1
Claude Model
Other
Is this a regression?
Yes, this worked in a previous version
Last Working Version
_No response_
Claude Code Version
2.0.55
Platform
AWS Bedrock
Operating System
macOS
Terminal/Shell
iTerm2
Additional Information
<img width="1078" height="300" alt="Image" src="https://github.com/user-attachments/assets/ce76c153-f212-48d3-ac1d-5352d780ec85" />
4 Comments
Found 1 possible duplicate issue:
This issue will be automatically closed as a duplicate in 3 days.
🤖 Generated with Claude Code
Not a duplicate of that issue.
opusplanuses the default Opus model, but for 3P providers, Opus 4.1 is still the default model. You can override it by setting theANTHROPIC_DEFAULT_OPUS_MODELenv var.This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.