A new entry from Claude's official release notes. The original text is quoted below; check the source link for context.
What changed (original text)
- Added Claude Haiku 5.5 (`claude-haiku-5-5`), now the default Haiku model on the Anthropic API — 1M context, $0.10/$0.50 per Mtok ($0.50/$2.50 for prompts over 100K) - Added `agentType` to the `subagentStatusLine` payload, so scripts can tell custom subagent types apart - Added `isDeferred` to `$.tool.register` for mods: `false` lists the tool's schema in the prompt from the start instead of behind tool search - Fixed Claude sometimes treating its own last actions before a context compaction as done after it, and retracting or redoing finished work - Fixed a memory leak where an HTTP MCP connection kept every request it had sent until it closed - Fixed a message sent while Claude was working being lost when `←` moved the session to the background; if a queued message can't move, `←` now stays put and says so - Fixed `/model` effort ←/→ wrapping past the highest or lowest level, which could accidentally save Low as a model's default effort - Fixed `/tui` disconnecting Claude in Chrome in a session started with `--chrome`, and ignoring `--no-chrome` - Fixed Claude being told to continue or message subagents with `SendMessage` in sessions, including resumed ones, where a host, a permission rule or a `--tools` list removed that tool - Fixed subagents and `--agent` sessions being told a built-in tool was disabled for the whole session when only their own tool list left it out - Fixed a claude.ai-synced skill's edited description sometimes not reaching the model until a new conver
Source: Claude Code changelog (view original)
Related articles
- Claude Code Installation Guide: native vs npm, Windows Included
- Claude Code vs Cursor: Key Differences and Which to Choose
- How to Use Claude Code: Real Usage After Install (Commands, VS Code)
- Claude Code vs Codex: Anthropic's CLI vs OpenAI's Coding Agent (2026)
- Claude Code Skills (Agent Skills) Guide: Extend Claude with SKILL.md