[Bug] Anthropic API Error: Long context beta unavailable for subscription

Bug Description
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"The long context beta is not yet available for this subscription."},"request_id":"req_011CYRQ9cQJjTy2DHBkbPsQD"}

Environment Info

• Platform: win32
• Terminal: vscode
• Version: 2.1.50
• Feedback ID: a7f75b81-28a8-4241-84ef-c2a58d18f9ec

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"The long context beta is not yet available for this subscription.\"},\"request_id\":\"req_011CYRQ9U8E3bhA6nzRupvui\"}\n    at generate (B:/~BUN/root/claude.exe:282:28230)\n    at makeRequest (B:/~BUN/root/claude.exe:321:5435)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-23T17:32:00.513Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"The long context beta is not yet available for this subscription.\"},\"request_id\":\"req_011CYRQ9cQJjTy2DHBkbPsQD\"}\n    at generate (B:/~BUN/root/claude.exe:282:28230)\n    at makeRequest (B:/~BUN/root/claude.exe:321:5435)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-23T17:32:02.411Z"}]