The biggest Fable in the story so far

A new model arrives

The week's defining release came from Anthropic, which introduced Claude Fable 5 in Claude Code v2.1.170. Announced as a "Mythos-class" model, Fable 5 is described as exceeding the capabilities of any model Anthropic has made generally available. For Claude Code users, updating to this version provides immediate access. The release also fixed a frustrating bug where sessions launched from the VS Code integrated terminal (or any shell inheriting Claude Code environment variables) weren't saving transcripts and thus wouldn't appear in --resume.

Bugbot gets dramatically better

Cursor delivered one of the most practical improvements of the week with a major upgrade to Bugbot. Bugbot is now over 3x faster, with average review times dropping from ~5 minutes to ~90 seconds. It's also finding 10% more bugs per review (0.62 up from 0.56) and costs ~22% less per run. These gains come from progress training Composer 2.5, and the /review command now works before pushing code and can be configured to only review what's new in a PR.

Session management and workspace tools

Several products focused on helping developers organize their work. OpenAI's Codex iOS client added a workspace file browser for previewing files and linking workspace paths into prompts, a directory picker for choosing workspace folders when starting new threads, and /goal support for creating and managing goals from mobile. A follow-up iOS release added branch selection and worktree creation for new threads.

Cognition's Devin introduced Session Folders, letting users group sessions into named folders in the sidebar with drag-and-drop support. Devin also added a !ultra Slack command to start Ultra sessions directly from chat and the ability to toggle between Ultra and Fast modes mid-session.

Claude Code v2.1.176 generated session titles in the language of your conversation and improved Bedrock credential caching, while v2.1.175 added an enforceAvailableModels managed setting that constrains the default model to an admin-defined allowlist.

MCP and tooling convergence

OpenAI's Codex CLI 0.140.0 added a /import command to selectively bring in setup, project config, and recent chats from Claude Code, while the 2026-06-11 app release added Developer Mode for browser use, giving Codex controlled Chrome DevTools Protocol access. On the mobile side, the iOS client added MCP approval choices for allowing requested actions in the current chat or across chats.

Grok Build iterated rapidly across multiple releases, adding Mermaid diagram rendering improvements, better session resuming, and fixes for tool call corruption. The CLI 0.2.39 allowed streaming live stdout/stderr from terminal commands, while 0.2.50 fixed Mermaid edge crossings and sequence diagram rendering.

Claude Code v2.1.172 allowed sub-agents to spawn their own sub-agents (up to 5 levels deep), and v2.1.169 fixed enterprise MCP policy enforcement not applying on reconnect or to IDE-typed configs. The macOS 2026-06-09 app added migration flows from Claude Code and Claude Cowork during onboarding, and the Codex CLI 0.139.0 enabled standalone web search in code mode with improved MCP schema compatibility.