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Anthropic Release notes and new features

San Francisco, US · 233 releases · 10 this month

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Anthropic releases

November 2026 digest

7 releases

Claude Platform

Claude Opus 5.5 launch

Claude Opus 5.5 is the first model in the Claude 5.5 family. It performs at the level of Claude Fable 5.1 while costing 40% less than Opus 5.

GA
Claude Code

Claude Code 2.1.280

What's changed Added Claude Opus 5.5 ( claude-opus-5-5 ), now the default Opus model , 1M context, $4/$20 per Mtok with $0.20/Mtok cache reads Added mouse support to more lists in fullscreen mode: the wheel scrolls the /skills list, and a skill's state options in /plugin can be clicked Added CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH to change the...

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About and activity

Anthropic, PBC is an American artificial intelligence (AI) public benefit corporation headquartered in San Francisco, California. Its flagship product is Claude, a series of proprietary large language models (LLMs).

Company profile
Official release-notes pages 10
Release-notes pageFeed
Claude apps release notes
support.claude.com
None
Claude Code changelog
github.com
None
Claude Code changelog (docs)
code.claude.com
None
Claude Code releases
github.com
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Claude Platform release notes
platform.claude.com
None
Claude Agent SDK (Python) releases
github.com
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Claude Agent SDK (TS) releases
github.com
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Python SDK releases
github.com
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System prompts release notes
platform.claude.com
None
TypeScript SDK releases
github.com
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