Changelog

Last verified: 14 April 2026 | Applies to: All plans

What Changed This Week

Updated weekly as part of newsletter research.

14 April 2026

Cowork goes GA, Managed Agents launch, Claude for Word completes the Office suite, and four more outages test operator patience.

Cowork generally available (9 April): Exited research preview. Now available on all paid plans (Pro, Max, Team, Enterprise) on macOS and Windows. Six new enterprise features: RBAC, group spend limits, expanded usage analytics, OpenTelemetry support, granular connector permissions, and Zoom MCP connector. Non-engineering teams now account for the majority of Cowork usage at early enterprise adopters. See Cowork.
Claude Managed Agents public beta (8 April): Fully managed cloud service for deploying AI agents. Secure sandboxing, built-in tools (OAuth, credential vaults), state management, error recovery. Pricing: $0.08 per session hour + standard token costs. Launch partners: Notion, Rakuten, Asana, Sentry.
Claude for Word add-in public beta (10 April): Completes the Microsoft Office suite (Word + Excel + PowerPoint). Sidebar with citations, tracked changes, comment thread processing, cross-app context sharing. Team and Enterprise plans. Word on web, Windows (M365 v2205+), and Mac (v16.61+). See Document Creation.
Advisor Tool API public beta (9 April): Lets a cheaper model (Sonnet 4.6 or Haiku 4.5) consult Opus 4.6 mid-generation. 11.9% cost reduction per agentic task. Beta header: anthropic-beta: advisor-tool-2026-03-01.
Project Glasswing (7 April): Cybersecurity initiative using Claude Mythos Preview (non-public model) to find zero-day vulnerabilities. 40+ partners including AWS, Apple, Google, Microsoft, CrowdStrike. Up to $100M in usage credits + $4M to open-source security organisations. Mythos Preview will not be released publicly. See Security & Privacy.
Claude Code v2.1.93-v2.1.101: /team-onboarding command, OS CA certificate store trust by default, Bedrock support via Mantle, flicker-free rendering, named subagents in @ mentions. See Code.
OpenClaw creator temporarily banned (10 April): Peter Steinberger’s account was suspended then restored. Escalation of the 4 April subscription lockout. See Cowork vs OpenClaw.
Pentagon case setback (8 April): Federal appeals court denied Anthropic’s request to block the “supply chain risk” blacklisting. The San Francisco preliminary injunction remains in place separately, creating a split. See Security & Privacy.
Google/Broadcom compute deal (7 April): 3.5 GW of next-generation TPU capacity from 2027, in addition to 1 GW already coming online in 2026. Run-rate revenue disclosed at $30B+ (up from ~$9B end of 2025). 1,000+ business customers spending $1M+ annually.
OpenAI $100/month Pro plan (9 April): Direct Claude Max competitor. 10x Codex usage vs Plus through May 31, dropping to 5x after. Codex gained real-time voice, MCP support, and multi-agent workflows.
Microsoft restricts free Copilot (effective 15 April): Copilot Chat removed from Word, Excel, PowerPoint, and OneNote for unpaid users. Only paid M365 Copilot licence holders retain in-app access.
Service incidents: 7 April (major outage, ~40 minutes, auth and login), 8 April (renewed connectivity issues), 13 April (51-minute outage). API less affected than consumer surfaces.
IPO trajectory: Employee tender offer wrapped up at $350B pre-money. Most employees chose to keep stock. October 2026 Nasdaq target with Goldman Sachs and JPMorgan.
Haiku 3 retirement: Still 19 April. Migrate to Haiku 4.5 immediately. See Models.
API code execution free: No additional charges when used alongside web search or web fetch tools. Container data retained for 30 days.

7 April 2026

OpenClaw lockout, Computer Use on Windows, Claude Code source leak, and ongoing reliability struggles. Anthropic cut off third-party harnesses from subscription limits, expanded desktop control to Windows, and had four service incidents in a week. Meanwhile, an accidental npm publish exposed Claude Code’s full source.

OpenClaw subscription access revoked (4 April): Claude subscription users can no longer use subscription limits for third-party harnesses like OpenClaw. Must use “extra usage” billing instead. Approximately 135,000 OpenClaw instances were running; a single day consumed $109.55 in tokens per user. Anthropic offered a one-time credit (redeem by 17 April, valid 90 days). Up to 30% discount available on pre-purchased extra usage bundles. This significantly changes the cost equation for OpenClaw users. See Cowork vs OpenClaw.
Computer Use expands to Windows (3 April): Desktop screen control is now available on Windows for Pro and Max subscribers in both Cowork and Claude Code. Can open apps, control keyboard and mouse, navigate pages, and work with files. No longer macOS-only. See Screen Automation and Cowork.
Claude Code source leak (31 March): v2.1.88 accidentally included a 59.8 MB source map on npm, exposing approximately 512,000 lines of TypeScript including the system prompt and 44 unreleased feature flags. No customer data was exposed. Anthropic called it “a release packaging issue.” See Code.
DOJ appeals Pentagon injunction (2 April): The Trump administration formally appealed to the Ninth Circuit. April 30 deadline for the government brief. The injunction remains in place for now.
GSA restores Anthropic (3 April): GSA officially restored Anthropic to federal procurement schedules following the injunction.
Coefficient Bio acquisition (~3 April): Anthropic’s first major acquisition. Approximately $400M all-stock deal for a stealth biotech AI startup (around 10 people, ex-Genentech). Team joins the health and life sciences group.
AnthroPAC registered (3 April): Employee-funded bipartisan PAC with a $5,000/year cap. First AI company PAC, alongside $20M already donated to Public First Action.
300K output tokens on Batch API: max_tokens raised to 300K for Opus 4.6 and Sonnet 4.6 on the Message Batches API. Requires the output-300k-2026-03-24 beta header.
1M context retiring for older models (30 April): Sonnet 4.5 and Sonnet 4 will lose 1M context beta access. Migrate to Sonnet 4.6 or Opus 4.6 before the deadline. See Models.
Claude Code v2.1.90-92: /powerup interactive tutorial (18 lessons), /cost per-model breakdown, plugin bin/ support, 60% faster diff computation, Bedrock setup wizard, named subagents, MCP 500K result persistence. See Code.
Claude Code Channels expanded: Now supports Slack, Discord, Telegram, and webhooks. Previously limited to Telegram and Discord.
Copilot Cowork GA date: 1 May 2026 as part of Microsoft 365 E7. See What Is Claude.
Service incidents: 1 April (Opus errors), 3 April (Sonnet errors), 4 April (both models), 6 April (major: Claude.ai, voice mode, Code login down for approximately 2 hours).
UK courting Anthropic (5 April): London office expansion proposals, potential dual stock listing, GBP 40M research lab.
IPO trajectory: Secondary market at $600B implied valuation (up from $380B reported in late March). Goldman Sachs and JPMorgan as lead banks. October 2026 Nasdaq target.
Haiku 3 retirement: Still 19 April. 12 days away. If your team uses Haiku 3 through the API, migrate to Haiku 4.5 immediately. See Models.

31 March 2026

Mythos leak, Pentagon injunction, IPO rumours, and a rough week for reliability. A CMS misconfiguration exposed next-gen model details, a federal judge blocked the Pentagon’s Claude ban, and Anthropic’s service had five incidents in six days.

Claude Mythos model leaked (26 March): A CMS misconfiguration exposed approximately 3,000 unpublished assets, including details of a next-gen model codenamed “Capybara” (Mythos). Described as “larger and more intelligent than Opus” with “dramatically higher” benchmark scores and unprecedented cybersecurity capabilities. Early access only — no public release date announced. Anthropic acknowledged the leak as “human error.” See Models and Security & Privacy.
Pentagon injunction granted (26 March): Judge Rita Lin issued a preliminary injunction blocking the Trump administration’s ban on government use of Claude. The ruling found that the “supply chain risk” designation was “classic illegal First Amendment retaliation.” Implementation delayed one week to allow for appeal. Pentagon CTO stated the ban “still stands” despite the ruling.
Anthropic IPO plans (27 March): Reports emerged of a potential IPO as early as Q4 2026 (October target), potentially raising $60B+. Current valuation sits at approximately $380B. Annual recurring revenue reportedly surpassed $19B.
March usage promotion ended (28 March): The doubled off-peak usage limits concluded as scheduled. All plans returned to standard allocation.
Copilot Cowork broader rollout (30 March): Microsoft’s Copilot Cowork moved from Research Preview to Frontier programme availability. Multi-model support (GPT + Claude) with built-in skills. Now available to M365 Frontier customers at $30/user/month. See Cowork for the distinction between this and Anthropic’s Cowork.
Claude Code v2.1.85–v2.1.86 (27 March): Session ID header for proxy aggregation, Jujutsu and Sapling VCS support, taskBudget option, enableChannel() for SDK MCP activation. Multiple bug fixes including --resume, --bare, and OAuth issues.
MCP milestone: 97 million monthly SDK downloads (up from approximately 2 million at November 2025 launch). Java SDK now GA. Go SDK now in beta. MCP connector public beta available for the Messages API.
Service incidents: March 25 (10-hour downtime), March 26 (warning followed by 2-hour downtime), March 27 (10-hour warning followed by 6-hour downtime — networking degradation), March 28 (warning), March 29 (Dispatch bug in Desktop v1.1.9310 — sessions received messages but replies never rendered, fixed in v1.1.9493). Five incidents in six days — one of the roughest stretches since launch.
Dispatch bug (29 March): Desktop v1.1.9310 shipped with a critical bug where Dispatch sessions received messages but replies never rendered for the user. Fixed in v1.1.9493. If your Desktop is on v1.1.9310, update immediately.

24 March 2026

Cowork gets screen control, mobile dispatch, and persistent projects. Major additions to Cowork this week, plus Claude Code performance improvements and service reliability issues.

Computer Use in Cowork (23 March): Research preview. Claude can now see and control your Mac screen — clicking, typing, opening apps. When no connector exists for a task, Claude falls back to native screen control rather than stopping. macOS only (Apple Silicon). Available on Pro and Max. Not recommended for sensitive data yet. Related to Anthropic’s Vercept acquisition (February 2025). This is different from the API computer use beta (which uses screenshots in a VM) and from Claude in Chrome (which uses DOM-based browser automation).
Dispatch (17 March): Send tasks from your phone to your desktop Cowork session. Requires the Claude mobile app (iOS/Android). Scan a QR code in Claude Desktop to pair your mobile and desktop. Tasks land in a persistent conversation thread. Available on Pro and Max.
Cowork Projects (20 March): Persistent workspaces in Cowork. Link local folders, set custom instructions, define recurring tasks, and enable per-project memory. Desktop only, paid plans.
Claude Code v2.1.78–v2.1.81 (18–20 March): --console flag for API billing authentication. “Show turn duration” toggle. VSCode /remote-control command to bridge to claude.ai/code. --bare flag for scripted calls (minimal output). Channels research preview — Telegram and Discord can push messages into Claude Code sessions. rate_limits in the statusline. Plugin source: 'settings' option. Effort frontmatter for skills. ~500ms faster startup. ~18MB memory improvement. Fixes for voice mode issues, concurrent auth, and Windows PATH.
API updates: Models endpoint now returns max_input_tokens, max_tokens, and a capabilities object — useful for programmatic model selection.
Claude in Chrome v1.0.63: Update released with a reported connectivity bug affecting Claude Code integration. If you’re experiencing issues, check for the latest extension version in the Chrome Web Store.
Service incidents: March 18 (Opus 4.6 elevated errors, Claude Code login issues), March 20–21 (responses hanging ~5 seconds after streaming completed), March 21 (Opus 4.6 and Sonnet 4.6 elevated errors), March 22 (claude.ai and login completely down, restored same day).
March usage promotion: Was active through 28 March. Doubled off-peak limits for Free, Pro, Max, and Team. Now ended — all plans returned to standard allocation.

17 March 2026

Major platform updates and site refresh. Updated all pages with March developments. Key changes this fortnight:

1M context window GA (13 March): Opus 4.6 and Sonnet 4.6 now support 1 million tokens at standard pricing — no beta header, no multiplier. Media limit increased from 100 to 600 images/PDF pages. Available on Max, Team, Enterprise, and API.
March usage promotion (13–28 March): Doubled off-peak usage limits for Free, Pro, Max, and Team. Off-peak = outside 8am–2pm ET weekdays; all day weekends. Enterprise excluded. Covers web, desktop, mobile, Cowork, Claude Code, Excel, and PowerPoint add-ins. Automatic — no opt-in required.
Interactive charts and visualisations (~13 March): Claude can create interactive HTML/SVG charts, diagrams, and data visualisations inline in chat. Beta, all plans including Free. Different from Artifacts — temporary and inline, not in the side panel.
Claude Marketplace (16 March): B2B marketplace for enterprise tools built on Claude. Zero commission. Launch partners: Snowflake, GitLab, Harvey AI, Replit, Rogo, Lovable.
Memory on Free plan (2 March): Chat Memory extended to Free users. Includes a memory import tool for bringing context from competing platforms (ChatGPT, Gemini).
Copilot Cowork (9 March): Microsoft product built on Claude’s Cowork technology. Runs inside M365 (Outlook, Teams, Excel). Research Preview at $30/user/month. E7 bundle at $99/user/month. Not the same as Anthropic’s Cowork — this is a Microsoft product.
Anthropic Sydney office (10 March): Fourth APAC office, joining Tokyo, Bengaluru, Seoul. Executive team visiting Australia late March.
Anthropic Institute (11 March): New research body for AI societal impact, led by co-founder Jack Clark (new title: Head of Public Benefit).
Claude Partner Network (12 March): $100M commitment for 2026. Launch partners: Accenture, Deloitte, Cognizant, Infosys. Free membership.
Web search expansion: Now available in Brazil and Japan (previously US-only). Automatically enabled for paid plans.
Claude Code v2.1.68–v2.1.77 (4–17 March): /loop command for recurring tasks. Voice mode via /voice (push-to-talk, 20 languages). /effort command (low/medium/high). MCP elicitation support. Opus 4.6 defaults to medium effort. 64k default output, 128k upper bound for Opus 4.6. /fork renamed to /branch (alias preserved). Opus 4 and 4.1 removed from first-party API. 1M context support for Max/Team/Enterprise. autoMemoryDirectory setting. modelOverrides setting.
API updates: thinking.display: "omitted" option for streaming without thinking content (16 March). Automatic caching with single cache_control field (19 February). Sonnet 3.7 and Haiku 3.5 retired — API requests return errors. Haiku 3 deprecated, retiring 19 April 2026.
Service incidents: 2–3 March (broad, ~14 hours), 6–7 March (Haiku 4.5 errors), 11 March (stalled chats, auth errors), 16 March (Sonnet 4.6 elevated errors, free tier).

All 92 “Last verified” tags updated to 17 March 2026.

3 March 2026

Site-wide toolkit update. Updated all 30+ pages with latest releases: scheduled tasks, 60+ connectors (up from 50+), Salesforce Agentforce 360, new connectors (Apollo, Outreach, DocuSign IAM, LegalZoom, Intuit/QuickBooks, FactSet), Claude Code on Standard Team seats, Enterprise self-serve signup, private plugin marketplaces, department-specific plugins, third-party extension RCE vulnerability warning, Frontier Safety Roadmap, and Sonnet 4.6 Chrome clarification. All “Last verified” dates updated to 3 March 2026.

2 March 2026

Claude outage. Users experienced intermittent service disruption across Chat and API. Service restored within hours. No data loss reported.

24 February 2026

The Briefing event. Anthropic hosted “The Briefing” — a major product event covering enterprise partnerships and integrations. Key announcements:

Salesforce Agentforce 360 — full CRM connector now in the Anthropic directory with MCP App support. Replaces the previous custom connector setup.
DocuSign IAM (Intelligent Agreement Management) — contract lifecycle management connector.
Intuit / QuickBooks — financial data connector for accounting workflows.
PwC partnership — enterprise AI deployment and consulting collaboration.
Enhancement Doctrine — Anthropic’s positioning framework: AI should enhance existing tools, not replace them. Significant shift from the “SaaSpocalypse” narrative that followed the plugin launch.
New connectors — Apollo, Outreach, FactSet, LegalZoom, SimilarWeb, and others added to the directory, bringing total to 60+.

Scheduled tasks in Cowork. The /schedule command enables recurring tasks (hourly, daily, weekly, weekdays only, or on demand). Available on all paid plans. Computer must be awake and Claude Desktop must be open.

Private plugin marketplaces. Enterprise plans can now distribute custom-built or approved plugins exclusively within their organisation.

Department-specific plugins. New plugins for PE modelling, HR, design, operations, and other department-specific functions.

Frontier Safety Roadmap. Anthropic published an updated safety framework covering model evaluations, red-teaming standards, and responsible development commitments.

Third-party extension vulnerability. A remote code execution vulnerability identified in third-party Claude Desktop extensions. Official Anthropic plugins are not affected.

Pentagon blacklist. Anthropic was flagged as a company with ties to Chinese investment, creating regulatory scrutiny.

Chinese AI distillation. Reports surfaced that Chinese AI companies have been distilling capabilities from Claude and other Western AI models to accelerate their own development.

20 February 2026

Claude Code update. New features include auto-review/fix/merge workflows, worktree mode for parallel development, and session continuity (resume where you left off). Relevant for operators using Claude Code for development workflows.

19–20 February 2026

Terms of Service clarification. Anthropic clarified that third-party OAuth-based access to Claude accounts is not permitted. This affects some automation workflows that relied on external tools authenticating as the user. Operators should use the official API, MCP connectors, or Claude Code CLI for programmatic access.

17 February 2026

Sonnet 4.6 released. New default model in Chat and Cowork on all plans including Free. Sonnet 4.6 introduces adaptive thinking (previously Opus-only) and beats Opus 4.6 on real-world office task benchmarks (GDPval-AA Elo: 1633 vs 1606). Major improvements in computer use via the API (72.5% on OSWorld — near human level). Same price as Sonnet 4.5. For operators, this means the default model is now genuinely excellent at everyday business tasks — drafting, analysis, reporting, financial work. Sonnet 4.5 moves to legacy status (still available via API). Note: Claude in Chrome has not yet been updated to Sonnet 4.6 — it still offers Sonnet 4.5.

13 February 2026

Operator’s Toolkit launched. The knowledge base goes live with the full site structure: Getting Started, Workflows, By Role, Platform Reference, Community, Enterprise, and Reference sections. Content is being populated in phases — platform pages and core workflows first, with role guides and enterprise content following.

11 February 2026

Free plan expansion. Skills, connectors (directory access), and file creation (Excel, Word, PowerPoint, PDF) now available on the Free plan. Free users can now access integrations from the Anthropic Connectors Directory, toggle skills for document creation and data analysis, and create downloadable files directly in chat. Custom MCP server URLs still require a paid plan.

10 February 2026

Cowork launches on Windows. Full feature parity with macOS. Available on Windows x64 — arm64 is not supported. Cowork can now read files, browse the web, execute code, and run plugins on Windows machines. Source: Anthropic

5 February 2026

Opus 4.6 released. New flagship model. Scores highest on finance benchmarks at time of release. Context window: 200K tokens default at launch, with 1M token context initially available in beta only (now GA as of 13 March — see above). Opus 4.6 introduces adaptive thinking — Claude dynamically scales reasoning effort based on task complexity, with four effort levels, replacing the binary extended thinking toggle.

30 January 2026

Knowledge-work plugins launched. Anthropic released 11 open-source plugins: Productivity, Finance, Legal, Sales, Marketing, Data, Product Management, Customer Support, Enterprise Search, Bio Research, and Plugin Create. All available at claude.com/plugins and on GitHub. This triggered significant reactions in software markets, as specialist SaaS companies faced direct competition from open-source alternatives.

27 January 2026

MCP Apps update. Claude can now render interactive UI elements for Slack, Asana, Figma, Canva, Box, Hex, monday.com, Notion, Amplitude, and Clay directly in chat. Approve tasks, send messages, and update cards without leaving the conversation. MCP Apps is an open extension to MCP — any developer can implement it. (Salesforce MCP App support launched with Agentforce 360 on 24 February 2026.)

January 2026

Claude in Chrome launched. Browser extension for Chrome (only — not Edge or other Chromium browsers) with workflow recording, scheduled tasks, multi-tab management, and “ask before acting” safety mode. Pro users limited to Haiku 4.5; Max, Team, and Enterprise get choice of Opus 4.6, Sonnet 4.5, or Haiku 4.5.

How to use this changelog

This page tracks significant changes to the Claude platform that affect operators. We update it weekly as part of newsletter research. Each entry includes the date, what changed, and (where possible) a source link.

Want these updates in your inbox? Subscribe to the newsletter — we cover these changes with context and practical implications.

Spotted something we missed? Let us know →

Something wrong or outdated? Let us know →

Get weekly updates — subscribe to the newsletter.