TL;DR (as of June 2026): Fastest fix that clears most stuck Cmd-K popups is Cmd+Shift+P -> “Developer: Reload Window,” which kills the stale streaming socket. If the popup shows “Taking longer than expected…” and hangs after a few edits in a row, that matches a regression reported in the Cursor 2.5/2.6 line — update to the latest build (3.x, current line as of June 2026) or, if you cannot, roll back to a known-good earlier build. If small edits also hang, check status.cursor.com and your model picker.
You select a chunk of code, press Cmd-K (Ctrl+K on Windows/Linux), type “extract this into a function,” and the small inline popup spins. Twenty seconds. Forty. A minute. Often it flips to a “Taking longer than expected…” state and stays there. No diff appears, no commit, no error. Hitting Cmd-K again either layers a new popup on top or silently does nothing.
Cmd-K (Cursor calls it Inline Edit) is simpler than Composer or Agent: it is a single-turn request that sends your selection plus a window of surrounding lines and expects a structured diff back. So when it hangs it is almost always one of six things, in order of how often we see it: a stale streaming socket from a cancelled request, a known build regression (the “Taking longer than expected…” hang), the context blowing past the model window because the file or selection is huge, the model picker landing on a degraded model, a corporate proxy buffering the stream, or your fast-request quota silently queuing the call.
Which bucket are you in
Run the two cheap probes first; they split six causes into one or two.
| Symptom | Most likely cause | Jump to |
|---|---|---|
| Hangs only after a few edits in a row; shows “Taking longer than expected…” | Build regression (2.5/2.6 line) | Cause 2 / Step 1, Step 7 |
| First Cmd-K after a cancel hangs; reload fixes it | Stale streaming socket | Cause 1 / Step 1 |
| Tiny one-line edit in a tiny file also hangs | Request lane: outage, proxy, or quota | Causes 4, 5, 6 / Step 4 |
| Works on a 50-line file, stalls on the big one | Context too large | Cause 3 / Step 2 |
| Diff never arrives but request “completes” | Model dropped the diff format | Cause 4 / Step 3 |
| Status page is green, small edits fine, big ones queue | Fast-request quota | Cause 6 / Step 6 |
Two probes that do most of the triage:
- Press Cmd-K on a one-line change in a small file. If that also hangs, it is the request lane (outage, proxy, quota, or build bug), not your context.
Cmd+Shift+P-> “Developer: Reload Window,” then retry the original edit. If it works now, you had a stale socket or accumulated UI state.
Common causes
Ordered by hit rate, highest first.
1. Stale streaming socket from a previous Cmd-K
If you cancelled a previous Cmd-K mid-stream (or it timed out), the underlying streaming connection can stay open in a half-closed state. The next request piggybacks on the dead socket and never completes. This is the single most common cause and the cheapest to clear.
How to judge: Cmd+Shift+P -> “Developer: Reload Window.” If the next Cmd-K works, that was it.
2. Known build regression: “Taking longer than expected…” hang
A regression reported across the Cursor 2.5/2.6 line behaves like this: after roughly three or more edits/turns in a session, the inline popup enters a “Taking longer than expected…” loading state and never returns, across every model (Sonnet 4.6, Opus 4.7, GPT-5.5, Composer 2.5). Earlier builds did not show it. Cursor shipped a fix in spring 2026, rolled into the current 3.x line.
How to judge: Help -> About and read the version. If you are on a 2.5.x or 2.6.x build and the hang only starts after a few good edits, this is it. Update to the latest build; if your org pins you to an old release, roll back to a known-good earlier build that predates the hang.
3. Selection plus surrounding context exceeded the model window
Cursor sends the selection plus a window of surrounding lines (and any @-mentioned files). On a multi-thousand-line file, or with @codebase/@file stuffed into the inline prompt, the request can blow past a practical streaming budget and stall. Selecting one function or about 50 lines gives the highest success rate; selecting an entire multi-thousand-line file is the classic hang.
How to judge: Try the same edit on a 50-line scratch file. Works there but not in the big file means context size.
4. Selected model has degraded or dropped the diff format
Inline Edit has its own model picker (the dropdown below the prompt box; the catalog comes from Settings -> Models). If it lands on a flaky preview or a model that returns prose instead of the structured diff Cursor expects, Cursor waits for a diff that never comes. Note: a recent update reportedly removed the per-model reasoning-effort toggle (Low/Medium/High) from this dropdown, so the menu may look slightly different than older screenshots.
How to judge: In the popup, open the model dropdown and switch to a known-good model such as claude-sonnet-4.6, gpt-5.5, or composer-2.5. Retry. If it returns, the previous model was the problem.
5. Network proxy or firewall is buffering the response
Cmd-K streams its diff. Corporate proxies that buffer an entire response before forwarding will hold the stream until completion or timeout, making the popup look hung even when the request is in flight.
How to judge: Disable the proxy or switch off the VPN, retry. If it returns instantly, the proxy was buffering.
6. Cursor account hit a rate limit silently
If you exhausted your fast-request quota mid-session, the call can queue without surfacing the wait. The popup looks hung; it is actually waiting in line.
How to judge: Open Cursor Settings -> Usage. If “Fast requests used” is at the cap, that is the queue. (Plans as of June 2026: Hobby free, Pro $20/mo, Pro+ $60, Ultra $200, Business $40/seat.)
Before you start
- Save the file first; if the edit eventually lands, you do not want to lose other changes.
- Know which model the Cmd-K popup is on (it can differ from Composer’s model).
- Have a tiny scratch file ready to isolate context-size issues.
Information to collect
- Cursor version (Help -> About).
- OS.
- Model currently selected in the Cmd-K popup (the dropdown below the input).
- File size and selection size where it hangs.
- Whether
@codebaseor@filementions are active in the prompt. - Whether it hangs immediately or only after a few edits (points to the build regression).
- Network setup: VPN, proxy, corporate firewall.
- Latest log line in
~/.cursor/logs/matchingcmdkorinline.
Step-by-step fix
Step 1: Reload the window
Press Escape to close the popup. Cmd+Shift+P -> “Developer: Reload Window.” This kills any stale streaming socket and clears accumulated UI state. Retry Cmd-K on the same selection. This alone clears the majority of stuck popups.
Step 2: Try a smaller selection and shorter prompt
Select 10 lines instead of 200. Type a three-word instruction instead of a paragraph. If it returns quickly, the original request was too big or too ambiguous; break the change into two Cmd-K calls. For anything larger than one function, prefer Composer.
Step 3: Switch the Cmd-K model
In the Cmd-K popup, open the model dropdown (its catalog is set in Settings -> Models). Switch to a known-good model such as claude-sonnet-4.6, gpt-5.5, or composer-2.5. Preview and reasoning-heavy models are the flakiest for inline edits specifically; Composer 2.5 is tuned for fast code edits and is a reliable fallback.
Step 4: Check the status page
Open status.cursor.com and your model provider’s status page (status.anthropic.com, status.openai.com). If either reports degraded inference, every Cmd-K will hang and there is nothing to fix locally — wait, or switch to a provider that is green.
Step 5: Bypass proxies temporarily
On a corporate network, switch to a phone hotspot or disable the VPN and retry. A diff back in about 5 seconds confirms the proxy was buffering. Long-term, ask IT to allowlist api.cursor.sh (and your model provider) as a streaming endpoint, not a buffered one.
Step 6: Check your fast-request usage
Settings -> Usage. If “Fast requests used” is at the cap, either wait for the reset, upgrade the plan, or switch the Cmd-K model to one that runs on slow requests (still works, just queued differently).
Step 7: Update Cursor (or restart cleanly)
If the popup specifically shows “Taking longer than expected…” and only after several edits, you are likely on the 2.5/2.6-line regression. Update via the in-app updater or download the latest build (3.x as of June 2026), which carries the spring-2026 fix. If your org pins you to an old release and cannot update, roll back to a known-good earlier build that predates the regression. Either way, fully quit first: Cmd+Q (closing the window leaves the process running), relaunch, reopen the file, and retry. A fresh process also clears state that survived “Reload Window.”
How to confirm it is fixed
- Run Cmd-K on a 5-line selection with a three-word instruction. It should return a diff in under 10 seconds.
- Repeat on a 100-line selection. It should return in under 30 seconds.
- Do three edits back to back without reloading. If none of them flip to “Taking longer than expected…,” the build regression is no longer biting you.
- Try the prompt that originally hung. If it now returns, you are done; if it still hangs, the prompt itself is too ambiguous — rewrite it more concretely.
- Run one Cmd-K end to end: preview the diff, then accept it and confirm the change lands in the file.
Long-term prevention
- Keep the Cmd-K model on a stable model (Sonnet 4.6, GPT-5.5, or Composer 2.5), not a preview.
- Stay on a current Cursor build; the worst inline-edit hangs of early 2026 were build bugs, not your setup.
- For files over about 2000 lines, use Composer instead of Cmd-K; Composer handles long context better.
- Avoid
@codebaseinside Cmd-K — it is meant for Composer and bloats the inline request past a healthy size. - Periodically reload the Cursor window during long sessions; sockets and UI state accumulate.
- Behind a corporate proxy, push for a streaming allowlist rather than fighting buffering every day.
Common pitfalls
- Hitting Cmd-K a second time while the first is still spinning. You get two requests in flight and neither finishes cleanly.
- Selecting an entire 3000-line file and asking for a global refactor. Cmd-K is for surgical edits; use Composer.
- Pasting a long prompt with multiple instructions. Cmd-K does best with one clear ask.
- Assuming the spinner means progress. It does not — it is a UI element waiting on a streamed response that may never arrive.
- Ignoring the model dropdown in the popup. Each new Cmd-K session can land on a different default.
- Confusing this with the Agent-mode hang when editing a file outside the workspace. That one is “External File Protection” (on by default) blocking the write — a different symptom from a Cmd-K diff that never streams.
FAQ
- What is the “Taking longer than expected…” message? A loading state Cursor shows when the inline request stalls. In the
2.5/2.6line it matched a regression that hung after a few edits; on current builds it usually means a genuinely slow request (large context, busy provider). - What is Cmd-K supposed to do? Take a selection plus a short instruction and return an inline diff you accept or reject without leaving the editor. With no selection, Cmd-K generates new code at the cursor instead.
- Why is it different from Composer? Cmd-K is single-turn, tightly scoped to the selection. Composer is multi-turn, can edit multiple files, and holds context across the chat.
- Can I retry without losing the prompt? Press
Escape, then Cmd-K again. Use the up-arrow to recall the previous prompt. - Does Cmd-K count toward the fast-request quota? Yes, every Cmd-K is one request against your plan.
- Is there a shortcut to cancel a stuck Cmd-K?
Escapecloses the popup, but there is no “cancel and free the request” — the underlying call may stay in flight until its server-side timeout. A “Developer: Reload Window” is the clean way to drop it.