Claude Code v2.1.170

Released Jun 9, 2026 (2 months ago).

"References this build" means the issue body mentions running 2.1.170 (from the bug-report template). It reflects report volume, not a proven defect count — an issue may mention a version without being caused by it. First-party data from the anthropics/claude-code tracker.

Top issues reported on v2.1.170

Ranked by community engagement (reactions and comments).

• [Bug] Timezone displayed as "Europe/Kiev" instead of "Europe/Kyiv"
  Open 💬 10 👍 57 #67435
• [BUG] API Error 400: data retention mode 'default' is not available for this model via AWS Bedrock
  Open 💬 6 👍 20 #66594
• Bundled ugrep OOMs the host: -E with two bounded {0,N} intervals explodes DFA construction to multiple GB
  Resolved 💬 21 👍 6 #67021
• [Feature Request] Add session-level effort override without persisting to default configuration
  Resolved 💬 4 👍 11 #67075
• [BUG] Windows desktop: 'Claude Fable 5 is currently unavailable' banner hides the working-directory switcher in active sessions
  Resolved 💬 8 👍 9 #68384
• Assistant text before/between tool calls is not rendered in the CLI, while hooks and the transcript still see it
  Open 💬 6 👍 8 #67051
• [BUG] Advising using Opus 4.8 Waiting for API response every time !!!
  Resolved 💬 3 👍 8 #70534
• [Bug] Anthropic API Error: Incompatible model for tool advisor when using claude-fable-5
  Resolved 💬 12 👍 5 #66742
• [Bug] Fable 5 model safety measures blocking normal conversation content
  Open 💬 14 👍 4 #66671
• Safety-classifier model switch (Fable 5 → Opus 4.8) fires on benign content and can't be overridden with /model
  Open 💬 13 👍 4 #67246
• [BUG] useAutoModeDuringPlan never applies when a session starts in plan mode (permissions.defaultMode: "plan")
  Resolved 💬 4 👍 7 #67180
• [Bug] Missing Fable 5 option in /advisor command choices
  Resolved 💬 1 👍 8 #66681
• [BUG] Desktop global "Auto-fix CI and address comments" toggle never applies to PRs created via gh from local sessions, and doesn't persist in claude_desktop_config.json
  Open 💬 2 👍 7 #68083
• [BUG] Bedrock: --thinking-display summarized is ignored — thinking blocks arrive with empty text (identical command works on first-party API)
  Open 💬 2 👍 7 #67729
• [Bug] TUI rendering issues with garbled text and missing output visibility
  Resolved 💬 8 👍 5 #66795
• [BUG] Native installer: in-memory buffering + no progress + 10-min hard timeout + restart-from-zero retries make updates impossible (and look like a deadlock) on slow routes to downloads.claude.ai
  Resolved 💬 3 👍 5 #66751
• Assistant text block is not rendered when AskUserQuestion tool call is in the same turn
  Resolved 💬 2 👍 5 #67166
• [Bug] Fable 5 safety classifier false-positives on authorized defensive security audits
  Resolved 💬 5 👍 4 #66697
• Allow reordering custom session groups in the sidebar (drag-to-reorder)
  Open 💬 1 👍 5 #73550
• [BUG] Claude Desktop (Windows) silently kills run_in_background tasks after 15-min idle — WarmLifecycle taskkills the embedded CLI process tree
  Open 💬 7 👍 3 #68625
• [FEATURE] Per-model effort level in settings.json (modelEffort map)
  Resolved 💬 4 👍 4 #67070
• [Bug] Fable 5 model unavailable due to overly broad safety filtering on biology topics
  Resolved 💬 4 👍 4 #66885
• [BUG] SSL certificate has expired not working since 2.1.190+ on mac
  Resolved 💬 12 👍 1 #71663
• [BUG] [BUG] After updating to 2.1.170, my working terminal interaction failed. Both trackerpad scrolling, and copy / paste were working. I can get copy / paste working using CLAUDE_CODE_DISABLE_MOUSE=1, but scrollback fails.
  Resolved 💬 6 👍 3 #66808
• [BUG] Thinking block no longer visible in VS Code extension
  Open 💬 2 👍 4 #68898
• [BUG] Azure AI Foundry Claude deployment rejected during validation (404 api_not_supported on /models/chat/completions)
  Open 💬 2 👍 4 #67179
• [BUG] Bun startup segfault on Windows 11 26200 + Intel Meteor Lake (Core Ultra 5 135U) — reproduced on current 2.1.170; prior report #55219 auto-closed as stale
  Open 💬 2 👍 4 #66683
• Scheduled tasks leak headless claude.exe --resume processes on Windows (never exit, accumulate until OOM)
  Open 💬 7 👍 2 #68626
• [BUG] `env` block in managed-settings.json does not apply OTEL env vars — initialization order issue
  Open 💬 7 👍 2 #67657
• [BUG] Repeated "image could not be processed" errors consumed ~60% of usage limit — 19 consecutive failures, each resending full 34MB context
  Resolved 💬 4 👍 3 #66815

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