Opus 5 is now the default Opus model (1M context, fast mode); Opus 4.7 exits fast mode. MCP allowlist and workflow-size defaults change, plus a broad fix pass across CLI.
claude-opus-5), now the default Opus model — 1M context, fast mode at $10/$50 per Mtoksandbox.network.strictAllowlist setting to deny non-allowlisted hosts for sandboxed commands without promptingDirectoryAdded hook that fires after /add-dir or the SDK register_repo_root control request registers a new working directory mid-sessionmcp_server_errors to the headless stream-json init event, listing --mcp-config entries skipped by config validation; terminal runs print a startup warningworkflowSizeGuideline settings key so the advisory Dynamic workflow size guideline can be set from any settings file; the /config row is hidden while one does--forward-subagent-text is set, keyed by their spawning Agent tool_use idclaude mcp list and /mcp when a server fails to connect, and a warning for MCP config values with hidden leading or trailing whitespace/config for changing itclaude --teleport to show which repo your current checkout points at when it doesn't match the session's repoclaude -p text output dropping the answer already produced when a turn dies on a mid-stream API error/model picker showing the merged Opus row as plain "Opus" instead of "Opus (1M context)"CLAUDE_CODE_GIT_BASH_PATH on Windows exiting or being used as bash when the path isn't a bash/sh binary; it's now ignored with a warning/config${VAR} entries to resolve from the startup environment and managed-settings env instead of settings-file env/model picker to highlight only the newest model's name, so the highlight marks the new release rather than an arbitrary subset of the list/fast now applies to Opus 5 and Opus 4.8