What's new in Claude

Fixed hook events not streaming during SessionStart hooks in headless sessions, which could cause remote workers to be idle-reaped mid-hook.

Major release with 40+ fixes: session stability improvements, background agent PATH handling, login expiration warnings with re-auth prompts, and a context-usage indicator optimization that eliminates a memory and CPU regression in interactive sessions. Fixes 15–20 second macOS stalls on background session open (regression from v2.1.196).

claude mcp login: authenticate a configured MCP server directly from your shell instead of the interactive /mcp menu, and clear stored credentials later with claude mcp logout.

Shell mode responds to command output: running ! npm test now gets an automatic explanation without needing a second prompt.

/rewind can now resume a conversation from before /clear was run, recovering context you thought was gone.

Background subagents surface permission prompts in the main session instead of auto-denying, so long-running agent chains no longer silently stall on blocked actions.

Claude Fable 5 & Mythos 5 restored: access is back after a 19-day suspension for US export-control compliance. A new safety classifier blocks the reported jailbreak in over 99% of cases. As of July 7, Fable 5 moves off standard subscription allowances and onto usage credits.

Claude Sonnet 5 launched at introductory pricing of $2/$10 per MTok (through Aug 31). Supports 1M token context, 128k max output, and adaptive thinking on by default. Note: new tokenizer produces ~30% more tokens than previous models.

Managed Agents streaming event deltas: opt in with event_deltas[] on the session event stream to preview agent message text as it generates, before the complete event arrives.

Managed Agents session config overrides: pass agent: {type: "agent_with_overrides"} at session creation to swap the model, system prompt, tools, or MCP servers for a single run without changing the agent definition.

Claude Code weekly limits are increasing 50%, now through July 13. Live now for all Pro, Max, Team, and seat-based Enterprise users.

Claude Cowork is now available on web and mobile in addition to desktop — sessions and files are saved to your Claude account and go where you go. Rolling out starting with Max plan over the next several weeks.

"This is our first time telling the story of how we first built and launched Claude Code, starting with its origins in Anthropic safety research. So much more to do. We are 1% done."

Clarified that while Fable 5 is leaving standard subscriptions after July 7, Anthropic aims to restore it as part of subscriptions "as soon as capacity allows." Also: dynamic workflows post walking through Claude writing its own harness on the fly.