Codex exits research preview for general availability at DevDay — adds Slack integration and SDK
On October 6, 2025, at its annual developer conference “DevDay 2025” in San Francisco, OpenAI announced that it had officially moved the coding agent “Codex” from its research preview that May to general availability (GA). Newly added were Slack integration that lets tasks be requested directly from Slack, a “Codex SDK” that lets developers embed Codex’s agent loop into their own projects, and admin tools for organizations — a milestone that cemented Codex’s shift from an individual’s experimental tool to a product built with enterprise adoption in mind.
Details
- Reasoning behind the GA move: OpenAI said that “since starting as a research preview in May, Codex has steadily evolved into a more reliable and capable development partner,” justifying the move to full general availability
- Slack integration: Added a feature that lets users delegate tasks directly by mentioning the Codex bot in a team’s Slack channel
- Codex SDK: Released the same agent loop used in the CLI and web versions as an SDK that developers can embed into their own apps and workflows
- Admin-facing features: Added environment management, monitoring, and analytics dashboards that let organization admins see usage and set policies
- Rapidly growing GPT-5-Codex: The model “GPT-5-Codex,” announced the previous month, was noted to have processed more than 40 trillion tokens within three weeks of release, becoming “one of the fastest-growing models ever”
- Pricing changes: Starting October 20, 2025, running cloud tasks began counting against usage limits. Slack integration and the Codex SDK were rolled out to all of ChatGPT Plus, Pro, Business, Edu, and Enterprise plans
What happened next
The move to GA marked the end of Codex’s experimental phase, establishing it as a core product in OpenAI’s developer-facing strategy. Dedicated model updates continued afterward with GPT-5.2-Codex (December 2025) and GPT-5.3-Codex (February 2026), and heading into 2026 its reach expanded beyond a coding-only tool, including a desktop app and broader use for knowledge workers.