[Bug] Anthropic API Error: Authentication incompatible with long context beta header
Status Fixed / completed
Maintainer reply None cached
Activity 5 comments · opened Oct 16, 2025 · closed Oct 25, 2025
Bug Description
I got error API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"This authentication style is
incompatible with the long context beta header."},"request_id":"req_011CUAc27tpWw3nSGZu9AfHP"}, and I can't use my subscription!
Environment Info
- Platform: darwin
- Terminal: cursor
- Version: 2.0.19
- Feedback ID: 0cc2dedb-407f-41ca-b2fe-a3c765f73e26
Errors
[{"error":"Error: Could not resolve authentication method. Expected either apiKey or authToken to be set. Or for one of the \"X-Api-Key\" or \"Authorization\" headers to be explicitly omitted\n at file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:206:3011","timestamp":"2025-10-16T09:00:28.801Z"},{"error":"Error: Could not resolve authentication method. Expected either apiKey or authToken to be set. Or for one of the \"X-Api-Key\" or \"Authorization\" headers to be explicitly omitted\n at file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:206:3011","timestamp":"2025-10-16T09:00:28.806Z"},{"error":"Error: Could not resolve authentication method. Expected either apiKey or authToken to be set. Or for one of the \"X-Api-Key\" or \"Authorization\" headers to be explicitly omitted\n at eS.validateHeaders (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:930)\n at eS.buildHeaders (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:8412)\n at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n at async eS.buildRequest (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:7470)\n at async eS.makeRequest (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:3309)\n at async wH1.model (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3226:19441)\n at async wH1 (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:2574:39781)\n at async zRQ (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3226:19595)\n at async file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3226:13795\n at async rn0 (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3226:4415)","timestamp":"2025-10-16T09:00:29.112Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"This authentication style is incompatible with the long context beta header.\"},\"request_id\":\"req_011CUAc25QkXmofSeoS1K2rC\"}\n at q4.generate (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:202:83047)\n at eS.makeStatusError (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:2117)\n at eS.makeRequest (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:5330)\n at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n at async gX1 (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1275:8784)\n at async qC1 (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3216:992)\n at async $t1 (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3216:1201)\n at async Promise.all (index 0)\n at async eF1 (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3216:2300)\n at async QRQ (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3226:482)","timestamp":"2025-10-16T09:00:55.609Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"This authentication style is incompatible with the long context beta header.\"},\"request_id\":\"req_011CUAc25SVD8qabnPeVUWHU\"}\n at q4.generate (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:202:83047)\n at eS.makeStatusError (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:2117)\n at eS.makeRequest (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:356:5330)\n at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n at async gX1 (file:///Users/yakan/.nvm/versions/node/v22.20.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1275:8784)\n at async qC1 (file:///Users/yakan/.nvm/versions/node/v22.20.0/Note: Error logs were truncated.
5 Comments
I have the same issue. It has been marked as resolved but I'm, on the latest version of Claude code (macOS). I'm unable to use my paid subscription.
@GenZMedia-ai as you marked this issue as closed, can you please also provide the solution?
+1, I am getting this error. I suspect the issue revolves around "not waiting long enough" from creating my account, making a purchase, and plugging it in... But I'll report back.
The error appears related to using
sonnet [1 million]specifically. Switching the/modelto just sonnet or haiku fixed my problem.... But aren't I paying forsonnet [1 million]??I'm seeing the same issue with the 1m model, using kilo code. Just activated the account, and tried using. Other models work fine.
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.