Timeline
Open-source plugin 'dont-let-me' released for Claude Code, Codex, and OpenCode
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
Open-source command-line tool Codex CLI was released as a free alternative to OpenAI's coding tools.
Ecosystem
Claude Code
Codex CLI
No mapped relationships
Benchmarks
Evidence (9 articles)
How to Orchestrate Claude Code with GPT and Gemini Using CLI Calls and Shared Context Files
Mar 16, 2026RSES CLI: Hand Off Coding Sessions Between Claude Code, Codex, and OpenCode in One Command
Mar 26, 2026Claude Code's Security Defaults: What It Ships When You Don't Ask
Apr 15, 2026Port Claude Code Workflows to Codex
Jul 19, 2026OpenDev Paper Formalizes the Architecture for Next-Generation Terminal AI Coding Agents
Mar 8, 2026AgentPulse: The Open-Source Dashboard That Solves Claude Code's
Apr 16, 2026Bridge Claude Code and Codex CLI for Multi-Agent Conversations
Mar 22, 2026Microsoft Open-Sources AI Engineer Coach, a Fitbit for Dev Workflows
May 22, 2026+ 1 more articles