Why is Cursor AI not working?

Cursor AI may stop working because: (1) the Cursor service is down — check prismix.dev/service/cursor for live status; (2) your Cursor Pro subscription has expired; (3) you have exhausted your monthly fast-request quota; (4) the underlying AI model (Claude or GPT-4o) is experiencing an outage; (5) a proxy or firewall is blocking Cursor's API calls.

Is Cursor AI down right now?

Check prismix.dev/service/cursor for live Cursor status updated every 5 minutes. Cursor routes AI requests through OpenAI and Anthropic models — if either of those services is degraded, Cursor may be affected even if Cursor itself is Operational.

Why is Cursor AI chat not responding?

Cursor chat not responding usually means: (1) you used up your monthly fast request quota — check Settings → Cursor Tab for usage; (2) the selected model (claude-3-5-sonnet, gpt-4o) is temporarily unavailable — switch models in the chat dropdown; (3) your Cursor subscription lapsed — go to cursor.com/settings to verify; (4) a network issue is blocking api.cursor.sh.

How do I fix Cursor slow or not generating code?

If Cursor is slow or not generating: (1) switch AI models — try claude-3-5-sonnet if gpt-4o is slow, or vice versa; (2) check if you hit the fast request limit (you still get slow requests after); (3) reload the Cursor window (Ctrl+Shift+P → Reload Window); (4) disable Cursor in .cursorignore for very large files; (5) check Cursor status at prismix.dev/service/cursor.

Developer 5 min read

Cursor AI Not Working

Chat not responding, inline completions gone, or slow generation? Here’s how to diagnose whether it’s Cursor or one of its underlying AI models — and how to fix either.

Cursor

Check first

Anthropic (Claude)

Cursor uses this

OpenAI (GPT-4o)

Cursor uses this

Cursor routes AI through both Anthropic and OpenAI. If either is degraded, Cursor AI features may fail even when Cursor itself is Operational.

What kind of problem are you seeing?

Cursor chat not responding at all

Most likely: you’ve hit your fast request quota, or the selected model is down. Try switching models in the chat dropdown (click the model name next to your message).

Inline code completions not showing (Tab)

Check: Settings → Cursor Tab → confirm enabled. Check if the file is in a type Cursor doesn’t suggest for (e.g., very large minified files). Reload window.

Cursor AI is very slow

You may be on slow requests (post-quota). Switch models — some are faster depending on capacity. Also check if you’re on a congested corporate network.

‘Unable to connect’ or network errors

Check your firewall/proxy. Cursor requires access to api.cursor.sh and cursor-cdn.anysphere.inc. Corporate SSL inspection can break these TLS connections.

5 fixes to try in order

Check your quota

Settings → Cursor Tab → look at Fast Requests remaining. When the fast quota is exhausted, Cursor switches to slow requests automatically. You’re still working — just slower. Quota resets at the start of each billing cycle.

Switch AI models

In Cursor chat, click the model name and switch between claude-3-5-sonnet, gpt-4o, claude-3-haiku. If one provider has an outage, another model from a different provider may be working fine.

Reload the Cursor window

Ctrl+Shift+P → “Reload Window”. This reconnects to the AI backend without restarting the full editor. Works for most transient connection failures.

Sign out and sign back in

Cursor settings → Account → Sign Out, then sign back in. Your Pro subscription credentials are re-verified at sign-in. Check cursor.com/settings to confirm your subscription is Active.

Update Cursor

Help → Check for Updates. Cursor ships updates frequently. Old builds sometimes fail to connect when the API endpoint changes. If using the stable channel and still broken, try the beta channel: cursor.com/downloads.

Cursor with a custom API key

If you’re using your own OpenAI or Anthropic API key (Settings → Models), failures are likely on the provider side:

Check your API key quota and billing at platform.openai.com/usage or console.anthropic.com
Confirm the key has the correct permissions (Models → the model you selected)
Try switching to Cursor’s built-in models temporarily to isolate the issue

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Get alerted when Cursor or its underlying models recover

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Cursor live status → Cursor status guide → Copilot not working → All guides →