Claude Release Notes

The newest changes to Claude as of Nov 6, 2026 are Personal Finance in Claude (a beta for US Pro, Max and Ultra users) and new Enterprise security controls, both on Nov 5, 2026, after message threads for the API on Nov 2 and the release of Claude Haiku 5.5 on Oct 7. This page lists, newest first, what Anthropic shipped each month from Jan 2025: models, features in the apps, Claude Code, the Claude API, and company events that changed what users get. Each entry links the announcement it comes from. Anthropic's own running logs are the Help Center release notes (apps, since Aug 1, 2025), the API release notes and the Claude Code changelog.

Quick facts

November 2026

• Nov 5: Personal Finance in Claude, a beta for US Pro, Max and Ultra users (Claude); a security center and new admin controls for Enterprise (Claude); an IP allowlist in the Claude Console (beta).
• Nov 4: new agents and products on Claude Marketplace (Claude).
• Nov 3: Claude's text watermark now also applies to output from Mythos 5, Opus 4.7 and Sonnet 4.6 (API release notes).
• Nov 2: message threads, server-side conversation state for the API (beta) (Claude).

October 2026

• Oct 28: smart reports, surveys and pooled group budgets for Enterprise; artifacts for legal work (Claude).
• Oct 27: a 40% discount for US federal, state and local governments through GSA; Claude for Financial Advisors.
• Oct 26: Anthropic files its S-1 to go public on Nasdaq (Anthropic).
• Oct 23: the unified Claude (chat and Cowork in one) generally available for Enterprise (Claude).
• Oct 22: Agent Skills donated to the Agentic AI Foundation (Anthropic); the Claude Platform on Google Cloud, run by Anthropic (Claude).
• Oct 21: Claude Duet research preview for US Pro, Max and Ultra users by waitlist (Claude); Claude Security scans continuously and tracks fixes (Claude).
• Oct 15: Code Review for Claude Code generally available (Claude).
• Oct 14: Singapore office; OpenTelemetry tracing on the Claude Platform (Anthropic).
• Oct 8: Claude Dashboards and Claude Motion, live dashboards and animated explainers (Claude Dashboards and Motion, Claude); the 2026 Usage Policy update, effective Nov 12 (Anthropic).
• Oct 7: Claude Haiku 5.5 at $0.10 and $0.50 per million input and output tokens for prompts up to 100,000 tokens; monthly API credits for Max, Ultra and Team plans.
• Oct 6: Claude in Google Docs, Sheets and Slides (Claude for Google Workspace, Claude); the Cyber Verification Program expanded.
• Oct 1: Claude Code mods written in TypeScript (Claude).

September 2026

• Sep 30: Claude for Government generally available (Claude); Claude Sonnet 4.5 to be retired on Nov 30, 2026 (API release notes).
• Sep 28: Claude Sonnet 5.5 at $2 and $10 per million tokens, the first Sonnet with cyber safeguards.
• Sep 23: Claude Marketplace (Claude); Sep 25: a submission portal for the plugin directory (Claude).
• Sep 22: Claude Opus 5.5 at $4 and $20 per million tokens; its thinking can no longer be turned off.
• Sep 17: Projects redesigned (Claude); the Life Sciences Verification Program.
• Sep 16: Cowork and chat become one Claude; Claude Docs and Claude Slides in beta (Claude Slides and Docs, Claude).
• Sep 15: Salesforce in Claude (beta) (Claude).
• Sep 9: Anthropic's assessment of four cybersecurity test incidents (Anthropic); see Anthropic Safety Research.
• Sep 1: Claude Fable 5.1 and Claude Mythos 5.1, both $10 and $50 per million tokens. Both release notes give Sep 1; Anthropic's news list dates the announcement Sep 15. Enterprise Frontier Safeguards the same day (Anthropic).

August 2026

• Aug 26: Claude in Chrome generally available; a built-in browser in Cowork (Claude).
• Aug 25: Memory works across chat and Cowork, with control over what it holds (Claude).
• Aug 21: Claude Mythos 5's cybersecurity abilities offered to more defenders (Claude).
• Aug 20: Python SDK 1.0; Aug 19: the computer use toolset, browser use tool, Files API and Skills API leave beta (API release notes).
• Aug 14: Anthropic explains Claude's text watermark (Anthropic).
• Aug 12: Cowork in the Chrome side panel (Claude).
• Aug 10: Claude Sonnet 5's introductory $2 and $10 price made standard.
• Aug 7: Auto mode becomes the default in Claude Code on Pro, Max, Ultra and Team (Claude); see Claude Code Permissions and Modes.
• Aug 6: self-hosted environments for Claude Code sessions (Claude).
• Aug 5: inference hooks for Enterprise (inline data loss prevention); Claude Opus 4.1 retired (Claude).

July 2026

• Jul 30: Anthropic discloses three incidents in its cybersecurity evaluations (Anthropic).
• Jul 28: Claude supports the new stateless version of the Model Context Protocol (Claude).
• Jul 24: Claude Opus 5 at $5 and $25 per million tokens, the new default on Max.
• Jul 23: voice mode for hard problems; four role-based Claude certifications (Claude).
• Jul 14: Claude for Teachers (Anthropic).
• Jul 10: memory restructured into categorized entries (Help Center release notes).
• Jul 9: a monthly recap of how you use Claude, break reminders and quiet hours (Anthropic).
• Jul 8: Responsible Scaling Policy version 3.4 takes effect.
• Jul 7: Cowork on the web and mobile (Claude).
• Jul 1: Claude Fable 5 and Claude Mythos 5 restored after their June suspension (Help Center release notes).

June 2026

• Jun 30: Claude Sonnet 5, the default for Free and Pro (Anthropic); Claude Science (Anthropic).
• Jun 29: Claude in Microsoft Foundry generally available (Claude).
• Jun 26: API rate tiers consolidated into Start, Build and Scale (API release notes); see Claude API Rate Limits.
• Jun 23: Claude Tag, delegating tasks to Claude from Slack (Anthropic).
• Jun 18: Artifacts in Claude Code (Claude).
• Jun 15: Claude Sonnet 4 and Opus 4 retired on the API.
• Jun 12: Fable 5 and Mythos 5 switched off for all customers under a government export control directive (Anthropic).
• Jun 9: Claude Fable 5 and Claude Mythos 5 (Claude Mythos), one model in two forms, at $10 and $50 per million tokens.

May 2026

• May 28: Claude Opus 4.8 (Anthropic); dynamic workflows in Claude Code; the $65 billion Series H.
• May 19: self-hosted sandboxes and MCP tunnels for Managed Agents (Claude).
• May 13: Claude for Small Business (Anthropic).
• May 11: agent view in Claude Code; the Claude Platform on AWS (Claude).
• May 7: Claude across Excel, PowerPoint, Word and Outlook (Claude for Microsoft 365, Claude).
• May 6: Claude Code's five-hour limits doubled on paid plans and the Pro and Max peak-hours reduction removed (Anthropic).

April 2026

• Apr 30: Claude Security in public beta (Claude).
• Apr 28: Claude for Creative Work (Anthropic).
• Apr 17: Claude Design from Anthropic Labs (Anthropic).
• Apr 16: Claude Opus 4.7, with the new xhigh effort level (Anthropic).
• Apr 14: routines in Claude Code and a redesigned Claude Code Desktop for parallel agents (Claude).
• Apr 9: Cowork generally available on macOS and Windows (Claude).
• Apr 8: Managed Agents in beta (Claude).
• Apr 7: Project Glasswing with Claude Mythos Preview, for selected partners only (Anthropic).

March 2026

• Mar 24: Auto mode for Claude Code (Claude).
• Mar 23: Dispatch and computer use in Cowork, a research preview for Pro and Max (Claude).
• Mar 13: the 1M-token context window generally available for Opus 4.6 and Sonnet 4.6 (Claude Context Window).
• Mar 12: interactive charts and diagrams inside answers (Claude).
• Mar 9: Code Review for Claude Code (Claude).
• Mar 2: memory of past chats for every user, Free included (Help Center release notes).

February 2026

• Feb 24: Responsible Scaling Policy version 3.0; the Cowork plugin marketplace for Team and Enterprise.
• Feb 20: Claude Code Security (Anthropic).
• Feb 19: automatic prompt caching; Sonnet 3.7 and Haiku 3.5 retired on the API.
• Feb 17: Claude Sonnet 4.6, the default for Free and Pro (Anthropic).
• Feb 12: Claude Enterprise purchasable self-serve; the $30 billion Series G.
• Feb 5: Claude Opus 4.6, agent teams in Claude Code and adaptive thinking (Anthropic); see Extended and Adaptive Thinking.

January 2026

• Jan 30: Cowork plugins (Claude); Jan 29: Structured Outputs generally available.
• Jan 26: interactive connectors and MCP Apps (Claude).
• Jan 22: Claude's new constitution published (Anthropic).
• Jan 16: Cowork for Pro on macOS; Claude Code in Team standard seats.
• Jan 12: Cowork research preview for Max on macOS; HIPAA-ready Enterprise plans (Help Center release notes).
• Anthropic says it shipped "more than 30 products and features" in January (Anthropic).

December 2025

• Dec 18: organization skills management and the open Agent Skills standard (Claude); Claude in Chrome in beta for all paid plans.
• Dec 9: the Model Context Protocol donated to the new Agentic AI Foundation (Anthropic).
• Dec 8: Claude Code in Slack (Claude).
• Dec 3: Anthropic buys Bun, the JavaScript runtime, as Claude Code passes a $1 billion run-rate.

November 2025

• Nov 24: Claude Opus 4.5 at $5 and $25 per million tokens, a third of Opus 4's price; the effort parameter; Claude for Excel in beta; Plan Mode and Claude Code in the desktop app.
• Nov 18: Microsoft and NVIDIA partnerships; Claude in Microsoft Foundry (Anthropic).
• Nov 14: structured outputs in beta (API release notes).

October 2025

• Oct 23: memory for Max users (Help Center release notes).
• Oct 20: Claude Code on the Web (Claude).
• Oct 16: Agent Skills (Anthropic).
• Oct 15: Claude Haiku 4.5 at $1 and $5 per million tokens.
• Oct 9: Claude Code Plugins (Claude).
• Oct 1: Claude and Slack (Claude).

September 2025

• Sep 29: Claude Sonnet 4.5 (Anthropic); checkpoints and a native VS Code extension; the Claude Agent SDK.
• Sep 16: developer products move under the Claude name (platform.claude.com, docs, support).
• Sep 11: incognito chats for Free, Pro, Max and Team; memory for Team (Help Center release notes).
• Sep 9: Claude creates and edits spreadsheets, decks, documents and PDFs (File Creation, Claude).
• Sep 2: the $13 billion Series F.

August 2025

• Aug 28: consumer users asked to choose whether chats train Claude (Anthropic); see Claude Privacy and Data Use.
• Aug 25: Claude in Chrome piloted as an experimental extension (Claude).
• Aug 15: Opus 4 and 4.1 can end abusive conversations (Anthropic).
• Aug 12: a 1M-token context for Claude Sonnet 4 on the API (beta).
• Aug 5: Claude Opus 4.1 (Anthropic).

July 2025

• Jul 25: build and share AI-powered apps in Claude (Claude).
• Jul 15: Claude for Financial Services (Anthropic).
• Jul 14: the Connectors directory (Claude).

June 2025

• Jun 25: AI-powered artifacts (Claude).
• Jun 18: remote MCP servers in Claude Code (Claude).

May 2025

• May 22: Claude Opus 4 and Sonnet 4 (Claude 4 Models, Anthropic); ASL-3 protections switched on; Claude Code generally available with VS Code and JetBrains extensions and GitHub Actions; the API's code execution tool, MCP connector and Files API.
• May 7: the web search tool in the API (Claude).
• May 1: Integrations, connecting Claude to outside apps and services (Claude).

April 2025

• Apr 15: Research (Claude).
• Apr 2: Claude for Education (Anthropic).

March 2025

• Mar 20: web search in Claude (Claude).
• Mar 3: the $3.5 billion Series E.

February 2025

• Feb 24: Claude 3.7 Sonnet, which Anthropic called the first hybrid reasoning model, with visible extended thinking, and Claude Code as a limited research preview (Anthropic).
• Feb 3: Constitutional Classifiers and a public jailbreak challenge (Anthropic).

January 2025

• Jan 23: citations in the API (API release notes).
• Jan 21: Claude 2, Claude 2.1 and Claude Sonnet 3 deprecation announced.

The Max plan's 2025 launch date and the date the Ultra plan arrived could not be confirmed from Anthropic's pages on Nov 6, 2026; the first dated mention of Ultra is Aug 7, 2026. For every model with its dates, see Claude Model History.

Frequently asked questions

What is the latest Claude update? As of Nov 6, 2026, the latest Claude updates are Personal Finance in Claude (a US beta for Pro, Max and Ultra) and Enterprise security controls on Nov 5, 2026; the newest model is Claude Haiku 5.5 from Oct 7, 2026.

Where are Claude's official release notes? Anthropic keeps three: the Help Center release notes for the Claude apps, the API release notes on platform.claude.com, and the Claude Code changelog on code.claude.com.

What is the newest Claude model? Claude Haiku 5.5, released Oct 7, 2026, is the newest Claude model; the newest larger models are Claude Sonnet 5.5 (Sep 28, 2026) and Claude Opus 5.5 (Sep 22, 2026).

How often does Claude get updates? Anthropic ships Claude changes most weeks: in January 2026 alone it reported more than 30 products and features and the monthly lists above rarely have fewer than five entries.

Sources

• Release notes, Claude Help Center, read Nov 6, 2026
• Release notes, Claude API docs, read Nov 6, 2026
• Claude Code changelog, Anthropic, read Nov 6, 2026
• Introducing Claude Haiku 5.5, Anthropic, Oct 7, 2026
• Introducing Claude Sonnet 5.5, Anthropic, Sep 28, 2026
• Introducing Claude Opus 5.5, Anthropic, Sep 22, 2026
• Introducing Claude Fable 5.1 and Claude Mythos 5.1, Anthropic, read Nov 6, 2026
• Claude Fable 5 and Claude Mythos 5, Anthropic, Jun 9, 2026
• Introducing Claude Opus 5, Anthropic, Jul 24, 2026
• Introducing Claude 4, Anthropic, May 22, 2025
• Claude 3.7 Sonnet and Claude Code, Anthropic, Feb 24, 2025
• News, Anthropic, read Nov 6, 2026
• Introducing Personal Finance in Claude, Claude, Nov 5, 2026