Anthropic’s madcap March: 14+ launches, 5 outages, and an accidental Claude Mythos leak

Claude Opus 4.6 released Feb 5 with a 1M‑token context window and 128K‑token output; Claude Sonnet 4.6 followed Feb 17 as the default on free and Pro plans, offering coding, computer-use, and agent-planning upgrades at Sonnet 4.5 pricing.

Memory for free users launched Mar 2, adding a ChatGPT/Gemini import tool to simplify switching.

Claude Marketplace went live Mar 6, letting enterprises apply existing Anthropic spend to Claude-powered tools from Replit, GitLab, Harvey, Snowflake, and Lovable, with Anthropic taking no cut.

Claude Code multi-agent review debuted Mar 9, dispatching parallel agents to catch bugs; substantive PR comments rose from 16% to 54%.

Mid‑March updates: Excel/PowerPoint integrations gained shared context, reusable Skills, and LLM gateway support (Mar 11); interactive visualizations and the Claude Partner Network launched Mar 12 (the latter with a $100M commitment, Accenture training 30,000, and Cognizant opening access to its 350,000-person workforce); 1M‑token context at standard pricing went GA Mar 14 for Opus 4.6 and Sonnet 4.6.