Claude Pro API Model Unavailability: Opus 4 Not Accessible

Bug Description
Claude tells me that Opus 4 is not available with the Claude Pro plan. I haven't changed my Pro plan, didn't touch any settings (defaults are used). This issue appeared after I rebooted my laptop, so I assume some inmemory settings were lost. Just updated to the latest version of claude code 1.0.61, it didn't help to solve the issue.

Environment Info

• Platform: darwin
• Terminal: cursor
• Version: 1.0.61
• Feedback ID: cf65a2ab-e410-4a3c-9bc9-18b8ba251375

Errors

[{"error":"Error: Command failed: security find-generic-password -a $USER -w -s \"Claude Code\"\nsecurity: SecKeychainSearchCopyNext: The specified item could not be found in the keychain.\n\n    at genericNodeError (node:internal/errors:983:15)\n    at wrappedFn (node:internal/errors:537:14)\n    at checkExecSyncError (node:child_process:883:11)\n    at execSync (node:child_process:955:15)\n    at i7 (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:865:5106)\n    at file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:777:49649\n    at Q (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:674:14420)\n    at kJ (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:777:47087)\n    at XH (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:777:45954)\n    at Y9 (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:777:52275)","timestamp":"2025-07-26T09:58:43.634Z"},{"error":"Error: 1: ENOENT \n    at oO6 (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1345:4765)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async sO6 (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1345:2187)","timestamp":"2025-07-26T09:58:44.038Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"system: Invalid model name\"}}\n    at i4.generate (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1317:7796)\n    at DP.makeStatusError (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1334:2101)\n    at DP.makeRequest (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1334:5315)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async UvB.kG1.showErrors (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:2902:14365)\n    at async kG1 (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:2345:5642)\n    at async UvB (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:2902:14216)\n    at async file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:2902:9271\n    at async bL0 (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:2902:1690)\n    at async ne (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:2902:9241)","timestamp":"2025-07-26T09:58:50.790Z"}]