Codex just got better for developers

Summary of technological concepts & product updates (Codex)

Codex integrated into ChatGPT

• Codex is integrated into the ChatGPT app
  • It appears in a dedicated space next to a new work agent.
  • The experience is meant to remain developer-focused, similar to the Codex product.

Frequent iteration / rapid releases

• The team reports 150+ updates in the past two months.
• Improvements continue on a weekly cadence.

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Model and coding/task delegation

New frontier model: “GPT-5.6 Sol”

• Positioned as a model available to everyone.
• Claims it can work on hard problems for a long time.
• Ultra mode is available with GPT-5.6:
  • Uses a larger reasoning budget.
  • Tradeoff: Ultra consumes token limits faster.

Parallelized execution via subagents

• Codex can automatically split work across subagents (no manual coordination needed).
• Users can:
  • View individual subagents
  • Or view a panel showing the full parallel “team” working toward a goal.

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Browser/computer automation (UI capture and test-like flows)

Faster computer/browser use with GPT-5.6

• Demo focus: creating an “appshot” from a simulator (described as a smarter screenshot).
• The appshot includes:
  • Screen pixels
  • App context
• Codex can then use the simulator itself to navigate UI screens.
• Example includes capturing App Store screenshots in English and French.
• Key claim: automation happens without the user controlling the cursor, while the user can continue working.

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Visual editing and code editing in the app/browser

In-app browser support + interactive editing

• Codex can generate and run a simple web app (e.g., a “paper plane game”) inside the in-app browser.
• Users can point-and-click annotate to request changes using visual context.

Browser enhancements for real apps

• Improved support for web apps requiring authentication, including passkeys.

Diff view + inline precision edits

• Users can switch to diff view.
• Codex supports precise inline edits beyond inspection.
• Two common workflows:
  • Make changes directly if you know the code change
  • Ask Codex to infer changes if you know the intended behavior

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Publishing/deploying apps

Sites for everyone (full-stack hosting)

• Previously introduced for Enterprise, now available more broadly.
• “Publish to Sites” includes:
  • Hosting
  • Authentication
  • Persistent database
  • File storage
• Goal: move from idea to a deployed full-stack app without managing infrastructure.

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Project/task organization and coordination

Codex helps manage its own tasks

• Example workflow:
  • Find bugs from Linear
  • Create separate tasks and isolated worktrees per bug
  • Pin the most critical work
• A coordinating view shows what is kicked off and what is moving.

Task cross-references

• Tasks can reference one another to link related work.

Bring context from ChatGPT

• If work begins in ChatGPT (e.g., via deep research), users can @mention the conversation to transfer context into Codex—avoiding copy/paste.

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Mobile upgrades (ChatGPT on mobile)

Task management from conversations

• Create, search, open, and manage tasks directly from a mobile conversation.

Better review workflow on mobile

• Filter review changes by:
  • Staged
  • Unstaged
  • Branch
  • Compare branches

Remote development connectivity

• Connect directly to an SSH host (e.g., a dev box) to start new tasks from a phone.

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PR (Pull Request) workflow inside Codex/ChatGPT

PRs without leaving the app

• Codex understands which branch each task relates to.
• When a branch has an open PR, the summary pane surfaces it automatically.

Fixing PR issues with full context

• If checks fail or comments appear, users can ask Codex to fix them in place using full context.

New PRs tab

• Explore code changes, leave inline comments, perform full reviews.
• Mark PRs as ready and merge directly.
• Emphasis: keep the workflow inside Codex rather than going to GitHub.com.

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Review/guides/tutorial references

• This is a product demo rather than a step-by-step written tutorial.
• It includes practical “how it works” demos for:
  • Goal + Ultra mode delegation
  • Appshot + simulator automation
  • Browser-based visual annotation edits
  • Diff view + inline code edits
  • “Publish to Sites” deployment
  • Task coordination tied to Linear and worktrees
  • Mobile task/review/SSH workflows
  • In-app PR review and issue remediation

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Main speakers/sources

• Primary speaker: the presenter (the name is not explicitly provided in the extracted text; referenced in subtitles only as “Let me show you…”).
• Source/org referenced: OpenAI (and Codex, ChatGPT, Build Week, Linear, GitHub/GitHub.com as applicable in descriptions).