Anthropic API Authentication Failure: OAuth Not Supported

Bug Description
API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not
supported."}}

Environment Info

• Platform: win32
• Terminal: vscode
• Version: 1.0.83
• Feedback ID: 1bb85022-c9a6-4edd-bb7a-ff9a0f3c3fc3

Errors

[{"error":"Error: 401 {\"type\":\"error\",\"error\":{\"type\":\"authentication_error\",\"message\":\"OAuth authentication is currently not supported.\"}}\n    at D6.generate (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:942:2449)\n    at sP.makeStatusError (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:959:2101)\n    at sP.makeRequest (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:959:5315)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async KSB.sG1.showErrors (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:24578)\n    at async sG1 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:13705)\n    at async KSB (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:24429)\n    at async file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:19524\n    at async cN0 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:5164)\n    at async V01 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:19494)","timestamp":"2025-08-17T20:01:19.219Z"},{"error":"Error: 401 {\"type\":\"error\",\"error\":{\"type\":\"authentication_error\",\"message\":\"OAuth authentication is currently not supported.\"}}\n    at D6.generate (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:942:2449)\n    at sP.makeStatusError (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:959:2101)\n    at sP.makeRequest (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:959:5315)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async KSB.sG1.showErrors (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:24578)\n    at async sG1 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:13705)\n    at async KSB (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:24429)\n    at async file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:19524\n    at async cN0 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:5164)\n    at async V01 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:19494)","timestamp":"2025-08-17T20:03:20.040Z"},{"error":"Error: 401 {\"type\":\"error\",\"error\":{\"type\":\"authentication_error\",\"message\":\"OAuth authentication is currently not supported.\"}}\n    at D6.generate (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:942:2449)\n    at sP.makeStatusError (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:959:2101)\n    at sP.makeRequest (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:959:5315)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async KSB.sG1.showErrors (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:24578)\n    at async sG1 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:13705)\n    at async KSB (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:24429)\n    at async file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:19524\n    at async cN0 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:5164)\n    at async V01 (file:///C:/Users/omitu/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1875:19494)","timestamp":"2025-08-17T20:03:33.923Z"}]