Fable Glitching after ask questions responses

[Samuel_Talenti (Sam Talenti)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

After answering questions posed by Fable 5 the chat will often hang. Seems to be model-specific.

Steps to Reproduce

1. Start plan session with Fable as model
2. Answer questions, hit enter/continue
3. Observe (~75% occurrence rate for me)

Expected Behavior

Agent should resume with answers in conversation context.

Screenshots / Screen Recordings

Operating System

MacOS

Version Information

Version: 3.17.8 (Universal)
VS Code Extension API: 1.128.0
Commit: 2fdd31c9f33f7fbe501f2d57772dc5bf64b63620
Date: 2026-08-20T02:18:12.724Z
Layout: Agent Window
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.291
OS: Darwin arm64 24.6.0

For AI issues: which model did you use?

Claude Fable 5

Additional Information

After the ask questions the chat fully stops, no spinning or stop button in the text bar, however when typing and sending a question the message is queued as if a chat is ongoing. Pressing send now produces what looks like a repeated message, see screenshot.

Does this stop you from using Cursor

No - Cursor works, but with this issue

[mohitjain (Mohit)]

Hey @Samuel_Talenti
This isn’t anything on your end - it’s an issue we’re tracking where the answer occasionally doesn’t make it back to the agent, so the turn looks done and your next messages queue.

When it stalls after you answer, send a short new message like “continue with my answers above” (use Send Now if it queues) to get it moving again - reloading the window or restarting Cursor recovers it if that doesn’t. I’ll post here when there’s an update.