claude-code - 💡(How to fix) Fix [BUG] Opus 4.6 1M context disappears from model picker, replaced by Opus 4.6 200k; default silently changes to Sonnet [1 comments, 2 participants]

TL;DR

The issue can be mitigated by manually selecting the Opus 4.6 (1M context) model each time a new session is started, although this does not persist across sessions.

Guidance

• Investigate the model picker's configuration to understand why the default model switched from Opus 4.6 (1M context) to Sonnet 4.6 (200k) without user input.
• Verify if there are any recent updates or changes in the Claude Code model picker that could have introduced this behavior.
• Check if the Opus 4.6 (1M context) model is correctly configured and available in the /model picker, and if there are any issues with its implementation that could cause it to disappear after selection.
• Consider reaching out to the developers or support team for Claude Code to report this issue and ask for assistance in resolving the model selection persistence.

Example

No code snippet is provided as the issue seems to be related to the configuration or implementation of the Claude Code model picker, rather than a specific code error.

Notes

The exact cause of the issue is unclear, and without further information about the Claude Code model picker's implementation, it is difficult to provide a definitive solution. The provided steps to reproduce the issue suggest that the problem is related to the model picker's behavior, but the root cause may be related to the configuration, updates, or implementation of the models themselves.

Recommendation

Apply workaround: Manually select the Opus 4.6 (1M context) model each time a new session is started, as this is the only reliable way to use this model until the issue is resolved.