What's new in Claude

Claude Sonnet 5 is now the default model in Claude Code, bringing a native 1M-token context window and promotional pricing of $2/$10 per MTok through August 31, 2026.

Organization default models (set by admins in the org console), readable session names at start, clickable file attachments via Cmd/Ctrl-click, and a security fix preventing untrusted workspace MCP servers from auto-spawning. Plus 20+ bug fixes including background agent reliability, PowerShell git diff, and rate-limit telemetry.

Added CLAUDE_CODE_DISABLE_MOUSE_CLICKS for fullscreen mode, fixed voice dictation issues on macOS and for spaceless languages, improved Remote session startup with a provisioning checklist.

claude mcp login — authenticate a configured MCP server from your shell instead of the interactive /mcp menu, with claude mcp logout to clear credentials.

Shell mode responds to command output — running ! npm test now gets you an explanation automatically, without a follow-up prompt.

/rewind across /clear — you can now rewind a conversation back to before /clear was run, recovering previously cleared context.

Background subagents surface permission prompts — instead of auto-denying, background subagents now bubble permission prompts up to the main session.

Claude Sonnet 5 launched (claude-sonnet-5) — introductory pricing $2/$10 per MTok through August 31, 1M token context, 128k max output. Adaptive thinking is now on by default; manual extended thinking removed. Note: uses a new tokenizer producing ~30% more tokens for the same text.

Managed Agents session event streams now support event deltas — opt in with event_deltas[] on the stream endpoint to preview agent message text as it generates.

Managed Agents session config override — pass agent with type: "agent_with_overrides" to replace model, system prompt, tools, MCP servers, or skills for a single session.

Fast mode removed for Claude Opus 4.6 — requests to claude-opus-4-6 with speed: "fast" now run at standard speed and standard rates. Migrate to Opus 4.8 to continue using fast mode.

Rate limits raised across the Claude API — Sonnet and Haiku limits now match Opus at every tier. Usage tiers consolidated to Start, Build, and Scale; most orgs move up, none move down.

Claude Sonnet 5 is here. Top-tier performance on coding and tool use at Sonnet pricing, with a 1M context window. It's the new default in Claude Code for Pro users, and available everywhere on the Claude Platform, including the API and Managed Agents.

Introducing Claude Sonnet 5, our most agentic Sonnet yet, making plans, using tools like browsers and terminals, and running autonomously.

You asked, we listened. Claude Desktop on Linux is here!