OpenAI Announces Major Model Deprecations Through 2026, Requiring Developer Migration

Summary

OpenAI has published a comprehensive deprecation schedule affecting multiple legacy models and APIs, with shutdowns scheduled throughout 2026. The deprecations include older GPT model snapshots, DALL·E models, the Assistants API, Sora 2 video generation capabilities, and several other endpoints. The company is phasing out these older systems as it launches newer, more capable models, with affected developers receiving email notifications and migration guides.

Notable deprecations include the Assistants API (sunset August 26, 2026), DALL·E model snapshots (May 12, 2026), Sora 2 video generation and Videos API (September 24, 2026), and various GPT model snapshots with different shutdown dates. OpenAI has introduced clear terminology distinguishing between "deprecated" (immediately retired but still accessible), "legacy" (no longer updated), and "sunset/shut down" (no longer accessible) to help developers understand the timeline and urgency of migration.

• All affected customers will receive email notifications with migration guides and documentation to transition their applications

Editorial Opinion

This deprecation cycle reflects the rapid pace of AI model development at OpenAI, where newer versions significantly outperform predecessors. While the staggered timeline gives developers time to migrate, the breadth of changes—particularly the Assistants API sunset—highlights the importance of building applications on current architectures to avoid future disruption. OpenAI's clear communication about timelines and migration paths is commendable, though developers should prioritize planning their transitions immediately.