Hi everybody, my name is Brian John and I'm excited today to talk to you about hacking sub agents in the codeex CLI. So who am I. I'm a principal fullstack engineer.My current focus at work is AI enablement for R&D. So think helping our R&D team members get their work done faster and with higher quality using AI. The company I work for is BetterUp.It's an awesome place to work. We've been using AI since the very beginning. I've been there for over eight years now, which is longer than any place I've ever wo ...

Product Overview - OpenAI releases GPT5 Codeex, optimized for agentic coding, available in various environments like terminal, IDE, GitHub, and ChatGPT iOS app [1][2] - GPT5 Codeex is included with ChatGpt Plus Pro business edu and enterprise plans [3] Performance Benchmarks - GPT5 Codeex achieves 74.5% on SWEBench verified, a slight improvement over GPT5's 72.8% [3] - Code refactoring sees a significant improvement with GPT5 Codeex at 51.3% compared to GPT5's 33.9% [3] - GPT5 Codeex can work independently for over 7 hours on complex tasks [4] - GPT5 Codeex uses 93.7% fewer tokens than GPT5 for simpler tasks but spends twice as long on complex use cases [6] - GPT5 Codeex reduces incorrect comments to 4.4% compared to GPT5's 13.7% and increases high impact comments to 52.4% from 39.4% [7] Features and Capabilities - Codeex is trained for code reviews, identifying critical flaws by navigating codebase, reasoning through dependencies, and running code and tests [6] - Codeex CLI updates include better formatted tool calls and diffs, simplified approval modes, and conversation state compaction [12][13] - Codeex automates environment setup by scanning for setup scripts and fetching dependencies at runtime [15] - Codeex can spin up its own browser, iterate on its builds, and attach screenshots to tasks and GitHub PRs [15] - Codeex reviews PRs by matching stated intent to the actual diff, reasoning over the codebase, and executing code and tests [16] Windsurf Integration - Windsurf is highlighted as a powerful agentic IDE, especially after being acquired by Cognition [9] - Windsurf offers features like deep wiki, vibe, replace, one-click MCP store, sophisticated memory, and deep integration with Devon [10][11] Pricing and Availability - Pro plan at $200 per month can support a full work week across multiple projects, positioning it as an additional developer [19] - Business plans offer credit purchases for exceeding included limits, while enterprise plans provide a shared credit pool [20] Infrastructure Improvements - Cloud infrastructure performance is improved by caching containers, reducing medium completion time for new tasks and follow-ups by 90% [14]