OpenAI ships ChatGPT-integrated Codex as Google readies Gemini Omni 1.1 Flash and DeepSeek releases open-source agent runtime

ChatGPT now hosts Codex end-to-end, from code writing to PR review

OpenAI has officially rolled out Codex, its advanced AI-powered coding agent, directly inside ChatGPT. The integration, described across OpenAI's help documentation, positions Codex inside the chat surface for writing or debugging code, running tests and commands, with a maintained changelog of release notes and administrative controls. A separate Codex help page covers a research preview called Codex Security, scoped to ChatGPT Enterprise and aimed at vulnerabilities in code.

The repository at openai/codex documents a local CLI variant of the same agent, distributed from releases. /codex, while a third-party integration guide instructs Codex to review GitHub pull request diffs, follow repository guidance and post a standard GitHub code review focused on serious issues. For developers, this means a single agent surface now spans in-chat generation, a downloadable CLI, an enterprise-tier security review tool, and a GitHub-side review bot.

Google targets developer creative workflows with Gemini Omni 1.1 Flash

Google's developer blog announced Gemini Omni 1.1 Flash, billing it as a release that brings a new suite of creative controls and generative video capabilities to developers. The framing on Google's own blog is "build with more control," indicating the update is positioned as finer-grained steerability for builders integrating the model into applications rather than a raw capability jump. For practitioners evaluating model choice today, the practical change is a broader control surface and an explicit video-generation path on the Flash tier.

DeepSeek pushes a composable, MIT-licensed agent runtime into the open

A Medium analysis describes DeepSeek Harness (dsh), released in August 2026, as an open-source, MIT-licensed agent runtime built on the premise that an AI agent equals a model plus harness. The framing — "the rise of the composable agent runtime" — matters because it positions the harness, the orchestration layer around model calls, as a separable, license-clean component developers can adopt without proprietary lock-in. With OpenAI shipping its own agent surfaces on the same day, the contrast is sharp: a closed, hosted agent inside ChatGPT on one side, and an open harness for self-hosted composition on the other.

What this means for a developer on 2026-08-28

Three different vendors moved on the agent layer in a single day, so the near-term decision is which boundary to commit to. Teams already inside ChatGPT can now point Codex at a repo for diff review, run it locally via the CLI, or pilot the enterprise-scoped security preview. Teams that prefer open composition can evaluate DeepSeek Harness under MIT terms and pair it with a model of their choice.

1 Flash's expanded controls. None of today's announcements ship a forward-looking date in the evidence, so concrete deadlines for migration, pricing changes or deprecations are not yet documented and should be tracked through each vendor's release notes and changelog rather than inferred. Useful supporting reads while you evaluate include ASCII Table for code reference work, Hello World in Different Programming Languages for cross-runtime sanity checks, and Generate a JWT for a GitHub App with HS256 for the GitHub-side review integration.