Add models manually (it just does not get added to the list)
Checked and no API key was added
Another observation, may or may not be related to this. As shown in the screenshot, there is always the buttons “Upgrade to Pro”, as if it does not detect my membership correctly (last month was Ultra and this month is Pro+), but I can still use Cursor normally. Log out and log in again did not solve this issue.
Does this stop you from using Cursor
Sometimes - I can sometimes use Cursor (only when I do not need those new models)
Your account is on Pro+ and hasn’t been downgraded. The “Upgrade to Pro” button and the missing models are actually the same problem - Cursor can’t confirm your subscription with our servers, so the app falls back to a free-tier view. On the free tier the model list drops to a smaller set, which is why the newer models (Sonnet 5, Fable 5) don’t appear and you’re left with a reduced set that still works.
Since you’ve already reinstalled and signed out/in, the next thing to check is whether something on your machine or network is blocking Cursor from reaching our servers:
Run Cursor Settings > Network > Run Diagnostics and share the results here - that’ll show if anything is failing.
In the same Network settings, set HTTP Compatibility Mode to HTTP/1.1, then fully quit and reopen Cursor (not just reload the window).
Check any antivirus/security software, firewall, VPN, or proxy on the machine - these can silently block the specific requests Cursor uses to verify your plan. Quick test: connect to a different network (like a phone hotspot) and reopen Cursor to see if your plan and models come back.
Once the app recognizes Pro+ again, the full model list should return and Sonnet 5 will show up. For Fable 5 specifically, if you have Privacy Mode enabled you’ll also need to accept its data-retention policy in the dashboard.
It turns out the issue comes from probably a new feature in Norton that starts to monitor AI agents, after turning it off, everything works well again. Many thanks!
