OpenAI Evals goes read-only on 31 October; Agent Builder ends 30 November

OpenAI Evals goes read-only on 31 October; Agent Builder ends 30 November

23 October 2026: Three OpenAI developer products reach their end in the next six weeks. Existing evals on the OpenAI Evals platform become read-only on 31 October 2026, and on 30 November the Evals dashboard and API, the v1/prompts API with its reusable prompt objects, and Agent Builder are all scheduled to shut down. OpenAI announced all three on 3 June; teams that have not migrated have a month left.

Not yet independently verified. OpenAI's deprecations page carries no publication date of its own; the dates here are those it gives for each notice, read on 23 October 2026. We will update this when it can be confirmed, and remove this note.

What closes and where OpenAI points users

Date	What changes	OpenAI's suggested route
31 October 2026	Existing evals become read-only	export results and move to another eval tool
30 November 2026	Evals dashboard and API shut down	Promptfoo, per OpenAI's migration guide
30 November 2026	v1/prompts API and reusable prompt objects shut down	move prompt content into application code
30 November 2026	Agent Builder shuts down	Agents SDK or ChatGPT Workspace Agents; ChatKit stays
1 December 2026	gpt-image-1-mini, gpt-image-1.5 and chatgpt-image-latest removed	gpt-image-2.5-sunburst or gpt-image-2.5-flare

The graders documented for eval workflows are part of the Evals transition, OpenAI says, while fine-tuning has its own timeline.

Why the 31 October date matters more than it looks

Read-only evals can still be viewed but not run, so any regression test suite that calls the Evals API as part of a release pipeline stops being useful a month before the shutdown itself. Teams that gate model or prompt changes on OpenAI-hosted evals should move those tests, and the datasets and graders behind them, before 31 October, not 30 November. Reusable prompt objects carry a similar hidden dependency: applications that fetch a prompt by ID at run time will fail when the endpoint goes, so the prompt text has to be copied into code or a prompt store and redeployed first.

Today's model shutdowns and what follows

The deadlines sit inside a longer retirement schedule. On 23 October OpenAI's page lists the shutdown of a set of legacy snapshots it announced in April, including gpt-3.5-turbo, gpt-4, gpt-4-turbo, gpt-4o-2024-05-13, gpt-image-1, o1, o1-pro and o3-mini, which we covered in September. Further dates on the same page include 11 December for a group of GPT-5 and o3 snapshots, 6 January 2027 for new fine-tuning jobs by existing customers and for the older text-to-speech models, and 14 January 2027 for GPT-4o and GPT-4.1, which we reported on 14 October.

Sources

• OpenAI API documentation: Deprecations (read 2026-10-23), 23 October 2026