CLAUDE

2026-07

Claude Opus 5

July 24, 2026. Anthropic released Claude Opus 5, a new AI model designed to deliver near Fable 5 performance at half the cost, emphasizing efficiency and safety.

// FULL RELEASE NOTES

2026-07

Claude Voice Mode: Opus, Sonnet, and Cross-App Automation

July 23, 2026. Anthropic upgraded Claude's voice mode to support Opus and Sonnet models (previously Haiku-only), added cross-app automation for Gmail, Google Calendar, Slack, Canva, and Notion, and expanded language support to 10 major languages.

2026-07

Claude Code v2.1.218 — Long-Session Performance and Stability Fixes

July 22, 2026. Claude Code v2.1.218 ships a critical quadratic slowdown fix affecting long Auto mode sessions, new filesystem isolation controls, and OAuth token resilience improvements.

2026-08

Legacy Workbench and Experimental Prompt Tools APIs Retired

August 17, 2026. The Claude Developer Platform retired its legacy Workbench and experimental prompt tools APIs, with access ending on this date.

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.

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.