[Bug] Model alias `opusplan` uses Sonnet instead of Opus in plan mode

Bug Description
opusplan model alias does not switch to Opus in plan mode - both plan and execution mode use Sonnet 4.6

Environment Info

• Platform: win32
• Terminal: pycharm
• Version: 2.1.52
• Feedback ID: 21e5aa32-07eb-4f43-bcaa-4d6c7a73c313

Errors

[{"error":"Error: ENOENT: no such file or directory, open 'C:\\ProgramData\\ClaudeCode\\managed-settings.json'\n    at Module.openSync (node:fs:559:18)\n    at Object.readSync (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:9:1291)\n    at Wj (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6487:105)\n    at qH (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6489:224)\n    at J_z (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:6011)\n    at nMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:5788)\n    at file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:4481\n    at async cMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:4857)\n    at async Object.callback (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:12569:391)\n    at async Md8.parseAsync (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6571:4156)","timestamp":"2026-03-16T07:10:16.720Z"},{"error":"Error: ENOENT: no such file or directory, open 'C:\\ProgramData\\ClaudeCode\\managed-settings.json'\n    at Module.openSync (node:fs:559:18)\n    at Object.readSync (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:9:1291)\n    at Wj (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6487:105)\n    at qH (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6489:224)\n    at J_z (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:6011)\n    at nMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:5788)\n    at iMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:5003)\n    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)\n    at async file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:8349","timestamp":"2026-03-16T07:40:18.266Z"},{"error":"Error: ENOENT: no such file or directory, open 'C:\\ProgramData\\ClaudeCode\\managed-settings.json'\n    at Module.openSync (node:fs:559:18)\n    at Object.readSync (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:9:1291)\n    at Wj (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6487:105)\n    at qH (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6489:224)\n    at J_z (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:6011)\n    at nMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:5788)\n    at iMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:5003)\n    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)\n    at async file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:8349","timestamp":"2026-03-16T08:10:18.252Z"},{"error":"Error: ENOENT: no such file or directory, open 'C:\\ProgramData\\ClaudeCode\\managed-settings.json'\n    at Module.openSync (node:fs:559:18)\n    at Object.readSync (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:9:1291)\n    at Wj (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6487:105)\n    at qH (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6489:224)\n    at J_z (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:6011)\n    at nMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:5788)\n    at iMq (file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:5003)\n    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)\n    at async file:///C:/Users/Admin/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:6473:8349","timestamp":"2026-03-16T08:40:18.274Z"},{"error":"Error: ENOENT: no such file or directory, open 'C:\\ProgramData\\ClaudeCode\\managed-settings.json'\n    at Module.openSync (node:fs:559:18)\n    at…

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