What's changed
Increased default maximum output token limits for Claude Opus 4.6 to 64k tokens, and the upper bound for Opus 4.6 and Sonnet 4.6 models to 128k tokens
Added allowRead sandbox filesystem setting to re-allow read access within denyRead regions
/copy now accepts an optional index: /copy N copies the Nth-latest assistant responseFixed "Always Allow" on compound bash commands (e.g. cd src && npm test) saving a single rule for the full string instead of per-subcommand, leading to dead rules and repeated permission prompts
Fixed auto-updater starting overlapping binary downloads when the slash-command overlay repeatedly opened and closed, accumulating tens of gigabytes of memory
Fixed --resume silently truncating recent conversation history due to a race between memory-extraction writes and the main transcript
Fixed PreToolUse hooks returning "allow" bypassing deny permission rules, including enterprise managed settings
Fixed Write tool silently converting line endings when overwriting CRLF files or creating files in CRLF directories
Fixed memory growth in long-running sessions from progress messages surviving compaction
Fixed cost and token usage not being tracked when the API falls back to non-streaming mode
Fixed CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS not stripping beta tool-schema fields, causing proxy gateways to reject requests
Fixed Bash tool reporting errors for successful commands when the system temp directory path contains spaces
Fixed paste being lost when typing immediately after pasting
Fixed Ctrl+D in /feedback text input deleting forward instead of the second press exiting the session
Fixed API error when dragging a 0-byte image file into the prompt
Fixed Claude Desktop sessions incorrectly using the terminal CLI's configured API key instead of OAuth
Fixed git-subdir plugins at different subdirectories of the same monorepo commit colliding in the plugin cache
Fixed ordered list numbers not rendering in terminal UI
Fixed a race condition where stale-worktree cleanup could delete an agent worktree just resumed from a previous crash
Fixed input deadlock when opening /mcp or similar dialogs while the agent is running
Fixed Backspace and Delete keys not working in vim NORMAL mode
Fixed status line not updating when vim mode is toggled on or off
Fixed hyperlinks opening twice on Cmd+click in VS Code, Cursor, and other xterm.js-based terminals
Fixed background colors rendering as terminal-default inside tmux with default configuration
Fixed iTerm2 session crash when selecting text inside tmux over SSH
Fixed clipboard copy silently failing in tmux sessions; copy toast now indicates whether to paste with ⌘V or tmux prefix+]
Fixed ←/→ accidentally switching tabs in settings, permissions, and sandbox dialogs while navigating lists
Fixed IDE integration not auto-connecting when Claude Code is launched inside tmux or screen
Fixed CJK characters visually bleeding into adjacent UI elements when clipped at the right edge
Fixed teammate panes not closing when the leader exits
Fixed iTerm2 auto mode not detecting iTerm2 for native split-pane teammates
Faster startup on macOS (~60ms) by reading keychain credentials in parallel with module loading
Faster --resume on fork-heavy and very large sessions — up to 45% faster loading and ~100-150MB less peak memory
Improved Esc to abort in-flight non-streaming API requests
Improved claude plugin validate to check skill, agent, and command frontmatter plus hooks/hooks.json, catching YAML parse errors and schema violations
Background bash tasks are now killed if output exceeds 5GB, preventing runaway processes from filling disk
Sessions are now auto-named from plan content when you accept a plan
Improved headless mode plugin installation to compose correctly with CLAUDE_CODE_PLUGIN_SEED_DIR
Show a notice when apiKeyHelper takes longer than 10s, preventing it from blocking the main loop
The Agent tool no longer accepts a resume parameter — use SendMessage({to: agentId}) to continue a previously spawned agent
SendMessage now auto-resumes stopped agents in the background instead of returning an errorRenamed /fork to /branch (/fork still works as an alias)
[VSCode] Improved plan preview tab titles to use the plan's heading instead of "Claude's Plan"
[VSCode] When option+click doesn't trigger native selection on macOS, the footer now points to the macOptionClickForcesSelection setting