Claude Code v2.1.247 — SendFeedback tool, /claude-api cost-optimize, Sonnet 5 1M-context auto-compact at ~967K
Anthropic
Released Aug 26, 2026. Adds a SendFeedback tool that drafts reports via /feedback; /claude-api cost-optimize profiles a project's Claude API spend across caching, token hygiene, batch, effort, and model choice; organization-customizable spinner tips with cooldown/priority; Auto-mode hint on Bash permission prompts; Admin API coverage (members, invites, workspaces, API keys, rate limit reports, workload identity federation, CMEK). Notable fixes: sub-agents dying on first-call model 404 (now uses fallback chain), Bash sandbox no longer deletes dotfile-managed settings.json symlinks, Ctrl shortcuts under Cyrillic layouts, MCP server-connectivity visibility when telemetry is disabled. Behavior change: Sonnet 5 auto-compact window expanded to its full 1M context (~967K tokens vs ~934K).
Why it matters
Largest Claude Code release of August — SendFeedback plus cost-optimize ship new agentic surfaces; Sonnet 5's 1M-context auto-compact is the first time that headroom is actually usable on the long-context model.
Importance: 3/5
frontier lab