CLAUDE

2026-08

Claude Tag Replaces Claude in Slack

August 3, 2026. Claude Tag officially replaces the existing Claude integration in Slack, offering enhanced team collaboration features.

// FULL RELEASE NOTES

2026-07

Claude for Teachers

July 14, 2026. Anthropic launched Claude for Teachers, giving verified US K-12 educators one year of free access to premium Claude capabilities, a teaching skills library, and curricula aligned to state academic standards.

2026-07

Claude Fable 5 Moves to Usage-Credits Billing

July 12, 2026. Claude Fable 5 transitioned to a usage-credits billing model for all Pro, Max, Team, and Enterprise subscribers. The free inclusion window — originally ending July 7 — was extended five days to July 12.

2026-07

ID Verification for Claude Users

July 8, 2026. Anthropic began requiring some users of Claude Free, Pro, and Max plans to verify their age or identity by uploading a government-issued ID, passport, or driver's license.

2026-07

Claude Code: Sonnet 5 Default, Chrome GA, Background Subagents

July 1–3, 2026. Claude Code ships Claude Sonnet 5 as its default model, brings Claude in Chrome to general availability, enables background subagents by default, and debuts Claude Desktop on Linux in beta.

2026-07

Claude Enterprise Admin Analytics and Cost Controls

July 2, 2026. Anthropic added richer admin analytics, model-level entitlements, and spend alerts to Claude Enterprise, giving organizations deeper visibility into usage and cost with automation via the Admin API.

2026-07

Access to Claude Fable 5 and Claude Mythos 5 Restored

July 1, 2026. Anthropic restored access to Claude Fable 5 and Claude Mythos 5 globally, with updated cybersecurity safeguards and renewed access for US organizations.

2026-06

Claude Sonnet 5

June 30, 2026. Anthropic released Claude Sonnet 5, its most capable Sonnet-tier model, offering near-Opus intelligence for coding and agentic work at a lower cost.

2026-06

Claude Science, an AI Workbench for Scientists

June 30, 2026. Anthropic launched Claude Science, a customizable AI workbench designed for scientists, integrating common research tools and providing flexible access to computing resources.

2026-06

Claude Mythos 5 Unblocked for US Institutions

June 26, 2026. The US government lifted its block on Anthropic's Claude Mythos 5 model, allowing its release to over 100 US institutions, including major companies and government agencies.

2026-06

Claude Tag Introduced for Team Collaboration

June 24, 2026. Anthropic introduced Claude Tag, a new way for teams to work with Claude, designed to proactively surface relevant information and manage tasks.

2026-06

Claude Design Major Overhaul

June 18, 2026. Claude Design received a major update, addressing token usage, improving design editing, and adding bi-directional sync for design system changes.

2026-06

Claude Fable 5 Free Tier Expires

June 23, 2026. Anthropic announced the expiration of the free subscription window for Claude Fable 5, with all usage now requiring credits at $10/$50 per million tokens.

2026-06

Claude Fable 5 Restored with New Restrictions

June 18, 2026. Anthropic restored access to Claude Fable 5 after a six-day shutdown, implementing nationality-based access controls and tightened safety classifiers.

2026-06

Access to Claude Fable 5 and Mythos 5 Suspended

June 12, 2026. Anthropic temporarily suspended access to Claude Fable 5 and Claude Mythos 5, citing unexpected demand and working to restore access.

2026-06

Claude Fable 5 + Mythos 5

Released June 9, 2026. Anthropic introduces Claude Fable 5, a new generally available Mythos-class model, and Claude Mythos 5, the same underlying model with safeguards lifted for vetted partners.

2026-06

Expanded Access to Claude Mythos

June 2, 2026. Anthropic expanded access to Claude Mythos for cybersecurity, making it available to 150 organizations in more than 15 countries.

2026-05

Claude Opus 4.8 + Mythos Preview

Released May 28, 2026. Most capable generally available Claude. Same post announces Claude Mythos — a new tier above Opus via Project Glasswing. Pricing: $5/$25 per MTok.

2026-05

Self-Hosted Sandboxes and MCP Tunnels for Claude Managed Agents

May 19, 2026. Announced at Code with Claude London. Self-hosted sandboxes (public beta) let enterprises run agent tool execution inside their own infrastructure; MCP tunnels (research preview) connect private MCP servers to agents without internet exposure.

2026-05

SpaceX Compute Deal + Higher Usage Limits

May 6, 2026. Anthropic announces a compute partnership with SpaceX alongside significantly higher usage limits for Claude Pro and API users.

2026-04

Claude Mythos Preview — Project Glasswing

April 2026. Anthropic's most capable model class, introduced alongside Opus 4.7. Mythos autonomously found thousands of zero-day vulnerabilities — deemed too powerful for general release. Ships only through Project Glasswing to critical-infrastructure partners.

2026-04

Claude Opus 4.7

Released April 16, 2026. Improved agentic reliability, substantially better vision with greater image resolution, and more creative professional output.

2026-02

Claude Sonnet 4.6

Released February 17, 2026. Current production-tier model. Default in Claude Code CLI and SDK. Best balance of speed, cost, and capability in the Claude 4 family.

2025-11

Claude Opus 4.5

Released November 24, 2025. Substantial gains on coding and workplace tasks including spreadsheet generation and document handling. Most capable Claude at launch.

2025-10

Claude Haiku 4.5

Released October 15, 2025. Fastest and most affordable model in the Claude 4 family. Sub-second latency and ultra-low cost — purpose-built for high-volume agentic pipelines.

2025-09

Claude Sonnet 4.5

Released September 29, 2025. Balanced production model — stronger coding and reasoning than Sonnet 4.0. Default for most Claude.ai and API users before Sonnet 4.6.

2025-08

Claude Opus 4.1

Released August 2025. Incremental step above Opus 4.0 — tighter agentic reasoning, improved computer use accuracy, and better multi-step task execution.

2025-05

Claude 4 Family Launch

Full Claude 4 model family ships — Sonnet 4, Opus 4, and the broader 4.x roadmap. All models include native tool use, extended context, and improved instruction following.

2025-02

Claude 3.7 Sonnet + Extended Thinking

First hybrid reasoning model in the Claude line. Toggle standard or extended think-time per request. Visible step-by-step reasoning for hard math, coding, and logic problems.