Probelma com moelos, ip bloquado uso somente de composer

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Subject: Cannot use any model except Composer — need Opus, Fable, Kimi K3

Cursor version: 3.15.6
OS: Windows 10.0.26200

PROBLEM:
I cannot use ANY model except Composer. All other models fail with provider errors.

Models I need but CANNOT use:

  • Claude Opus
  • Fable
  • Kimi K3
  • (also tried Grok — same issue)

Only working model: Composer

Example error (Grok/x.ai):
Full Cloudflare HTML block page: “Sorry, you have been blocked” /
“You are unable to access x.ai”

Request ID: d821d441-29dd-4453-88ed-bd51d9e9548
Cloudflare Ray ID: a297d690de0ad679
Blocked IP (appears to be Cursor AWS infra): 3.209.66.12

Troubleshooting already done:

  • Full PC restart
  • Cursor logout + login
  • cursor.general.disableHttp2: true (HTTP/1.1 forced)
  • No VPN, no proxy on machine
  • Network check: api2.cursor.sh HTTP 200, cursor.com OK
  • status.cursor.com shows All Systems Operational (no active incident)

Expected: Access to Opus, Fable, Kimi K3 and other Pro models.
Actual: Only Composer works — all others return Provider Error.

Please investigate why all non-Composer models fail for my account.

Steps to Reproduce

nao da pra reproduzir pq o ip de vcs nao ta bloqueado

Operating System

Windows 10/11

Version Information

a mais nova, tudo atualizado

For AI issues: which model did you use?

somente composer 2.5, nenhum outro é possivel usar

Does this stop you from using Cursor

Yes - Cursor is unusable

5

Hey, thanks for the detailed report. Good news: IP Cursor isn’t blocked, and your account is fine. The cause is something else.

It looks like you have a personal API key enabled (BYOK), likely an Azure API entry with an empty Base URL. When a personal key is enabled, all models except Cursor models go through that key config. Composer always uses Cursor infrastructure, which is why only it works, while Opus, Fable, Kimi K3, and Grok fail with a provider error.

How to fix:

  • Open Settings > Models > API Keys
  • Turn off all toggles for personal API keys (start with Azure API, it’s currently enabled with an empty Base URL)
  • Or, if you want to use Azure, enter a valid Azure Base URL and deployment name

After that, Opus, Fable, Kimi K3, and Grok should start working right away.

One more note: seeing a generic provider error instead of a clear invalid configuration message is frustrating. I’ve flagged this to the team so validation is clearer.

Let me know if anything still doesn’t work after you disable the keys.