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Changelog — Claude Code & Ecosystem Updates

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Major changes, new features, and deprecations through May 2026. For Anthropic's authoritative release notes (always more current than this file), see docs.anthropic.com/release-notes/claude-code.

🆕 New features

Models & performance

  • Claude Opus 4.7 (current flagship, May 2026) — Sharper adaptive thinking, better long-context grounding, more reliable tool calling. Same pricing as Opus 4.6.
  • Claude Sonnet 4.6 (current balanced tier, May 2026) — Replaces Sonnet 4.5 as the default everyday model.
  • 1M context window — Beta via API (200K in subscriptions).
  • Fast Mode — 2.5× faster responses with /fast (runs on Opus 4.6 underneath).
  • Haiku 4.5 — Fast, lightweight model for simple tasks (unchanged).

Agent features

  • Agent Teams (experimental) — Multi-agent collaboration in a single session. Enable with CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1.
  • Team leads & teammates — Hierarchical agent structure with shared task lists.
  • Parallel agent execution — Multiple agents working simultaneously.

Commands & tools

  • /fast — Toggle Fast Mode for rapid responses.
  • /auth login, /auth status, /auth logout — Authentication management.
  • /debug — Troubleshoot the current session.
  • /teleport — Send a session to claude.ai/code for web access.
  • /rename — Auto-generate descriptive session names.
  • /hooks — Interactive menu for hook configuration.

MCP ecosystem

  • MCP Registry — Official registry live at registry.modelcontextprotocol.io.
  • MCP Apps — Interactive UI components from servers.
  • OAuth support — Built-in client-credentials authentication.
  • Agentic AI Foundation — MCP now maintained by the Linux Foundation.
  • Async operations — Non-blocking server operations.
  • Server discovery — .well-known URLs for automatic discovery.

Hooks enhancements

  • New hook events — TeammateIdle and TaskCompleted.
  • PreToolUse updatedInput — Hooks can now modify tool parameters.
  • Interactive configuration — /hooks command for easier setup.

Other features

  • Automatic memory — Recording and recall across sessions.
  • PDF support — Read PDFs with page-range selection.
  • Shift+Enter — Built-in newline support (zero setup needed).
  • Wildcard permissions — More flexible tool permission patterns.

📝 Changed

Subscription & pricing

  • Pro plan — Now includes ALL models (Opus 4.7, Sonnet 4.6, Haiku 4.5, plus the previous-generation 4.6/4.5). Previously: Sonnet 4 only.
  • Usage metrics — Changed from token counts to message counts. Pro: ~45 messages per 5-hour window. Easier to understand and track.
  • Unified subscription — One subscription for both web (claude.ai) and CLI.
  • Average costs — Pro users spend ~$6/day on coding (90% under $12/day).

MCP ecosystem

  • MCP governance — Donated to the Agentic AI Foundation (Linux Foundation). Open governance, vendor-neutral.
  • Registry status — Changed from "future vision" to live production service.

Model IDs

Use specific model IDs instead of generic references:

  • claude-opus-4-7 (current flagship; previously claude-opus-4-6)
  • claude-sonnet-4-6 (current balanced; previously claude-sonnet-4-5-20250929)
  • claude-haiku-4-5-20251001 (unchanged)

Previous-generation IDs (claude-opus-4-6, claude-sonnet-4-5-20250929) remain accessible — useful when you need stable behavior or Fast Mode (which still runs on Opus 4.6).

Commands

  • Authentication — Use /auth login instead of /login.
  • Terminal setup — Shift+Enter is now built-in; /terminal-setup still available for iTerm2/VSCode custom bindings.

❌ Deprecated

Subscription tiers

  • Separate Opus access — No longer needed; Opus is included in Pro ($20/mo). No separate "Opus-only" tier.

Workarounds

  • Manual token calculations — Use /cost instead. Built-in token tracking, real-time usage monitoring.

Legacy commands

  • /login and /logout — Use /auth login and /auth logout instead. Still functional but the new commands are preferred.

📅 Important dates

  • September 2025 — MCP Registry launched.
  • January 2026 — Claude 4.5 / 4.6 model family released (Opus 4.6, Sonnet 4.5, Haiku 4.5).
  • February 2026 — Agent Teams experimental release. Fast Mode launch promotion ended Feb 16.
  • May 2026 — Opus 4.7 and Sonnet 4.6 released.

🔮 Coming soon

Based on the public roadmap and experimental features:

  • Agent Teams general availability
  • 1M context window in subscriptions (currently API-only)
  • Enhanced MCP Apps capabilities
  • Persistent agent teams across sessions
  • Visual team dashboard

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