Timeline
Open-source plugin 'dont-let-me' released for Claude Code, Codex, and OpenCode
ChatGPT nearing 1 billion weekly active users, 7 months after original internal deadline
Claude Code now ships with Plan mode as a first-class safety rail for cross-file refactors
Claude Code skills feature introduced, allowing reusable instruction packs in ~/.claude/skills/
Plan mode and CLAUDE.md/skills introduced for Claude Code
Claude Code's Plan mode introduced as a safety rail for cross-
Claude Code adds iOS Simulator support for building and testing iOS apps from the terminal
OpenAI launched dreaming memory system for ChatGPT that retains user preferences across sessions
OpenAI merged Codex into ChatGPT
ChatGPT market share fell below 50% for first time to 46.4%.
Ecosystem
Claude Code
ChatGPT
Benchmarks
Evidence (9 articles)
Claude Opus 4.6's New 'Personality' and How to Code with It Effectively
Mar 17, 2026Claude Paid Subscribers More Than Double in Under Six Months, Credit Card Data Shows
Mar 28, 2026Claude Code Quality Drops Post-4.6, Users Report 25% Task Failure Rate
Jun 3, 2026Mark Cuban Deploys Mac Mini AI Agent to Automate Unsubscribing from AI-Generated Cold Emails
Mar 20, 2026How to Build a Content Pipeline CLI with Claude Code's Shell Access
Apr 13, 2026SkillsMP Launches AI 'App Store' with 270,000+ Claude Skills for Seamless Code Automation
Mar 2, 2026Anthropic Democratizes AI Memory: Claude's Free Tier Gets Contextual Recall
Mar 2, 2026Simon Willison's 'Stages of AI Adoption' — Where Are You on the Claude Code Journey?
Mar 14, 2026+ 1 more articles