61 people reported
All time, since Sep 23, including 45 thumbs-up on GitHub.
Auto-compaction loses session context
“Claude Code's automatic context compaction runs mid-session with no user consent or confirmation prompt.”
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6 bugs in this theme
- Idle auto-compactionNo workaround yet35 people
- Opus 4.6 context capped at 200K12 people
- Auto-compaction loses session contextNo workaround yet6 people
- Autocompact thrashing ends sessionNo workaround yet3 people
- Auto-compaction fires earlyNo workaround yet3 people
- Idle after compactionHas a workaround2 people
What's included
- Compaction runs mid-session with no warning, pause or consent, and the session forgets instructions, decisions and task state
- Compaction fires far below the context limit on 1M-window models, at roughly 24–45% usage, after recent updates
- Idle sessions compact before the prompt cache expires ("Compacted while idle, before the prompt cache expired"), with no opt-out
- Repeated compaction loop ends with "Autocompact is thrashing: the context refilled to the limit within 3 turns", including in subagents
- After compaction the agent re-reads the same files instead of continuing from where it left off
Not included
- Running out of usage or rate limits unrelated to context compaction
- Manual /compact or /clear behaving differently from what the user asked
- Write tool overwriting file contents, apart from context loss
Original reports16, newest first
- Session goes idle after auto-compaction instead of continuing the work the assistant just announced#104920
- Manual /compact during in-progress work leaves the agent idle; a filler message is needed to resume#104378
- Auto-compact runs while idle after prompt cache expires, forcing manual session restarts#102332
- Auto-compaction triggers early at 24-45% of 1M context window with no user config#101430
- Auto-compact triggers early at ~89% context remaining#101209
- Auto-compaction fires at 281K–845K tokens on 2.1.296 for claude-opus-5-5 (documented default ~967K)#101067
- Session context lost during auto-compact, forcing restart of development workflow#100710
- Merged Claude app runs Opus 4.6 at 200K context on Max 5x (help center says 500K); ~92K fixed overhead leaves ~50K per compaction cycle#100502
- Auto-Compact triggers prematurely on Opus 5.5 1M context window#100277
- Auto-compaction runs without user consent and degrades quality of long sessions#99860
Show all 16Show only the newest 10
- This "Claude ran out of context on this turn" is really common i am facing this…#99612
- Context exhaustion + Write tool overwrote append-only file — full day of design work lost#98967
- 2.1.286 idle compaction silently discards working context in long-running sessions; no opt-out, logged as "manual"#98747
- Autocompact thrashing crashes subagent researching auto-compact behavior itself (invalid_request error)#98158
- Auto-compact repeatedly re-reads same files instead of continuing from prior state#96414
- Autocompact thrashing due to context window refill within 3 turns#96379