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Model provider · OpenAI API

OpenAI model and API lifecycle

Tracks official OpenAI deprecations and migration guidance for API models, endpoints, tools, and request fields.

2Verified changes
2Upcoming cutoffs
9Affected identifiers
2Official sources

Action required

Upcoming OpenAI deadlines

Complete and regression-test each migration before the provider's announced cutoff.

29 days left

OpenAI Assistants API shuts down on August 26, 2026

Use the official Assistants-to-Conversations migration guide to move state and execution to Responses and Conversations.

OpenAI · OpenAI API62 days left

Four legacy OpenAI models shut down on September 28, 2026

Choose gpt-5.4-mini or gpt-5-mini based on workload requirements, then migrate and test the integration.

OpenAI · OpenAI API

Verified July 26, 2026

Published OpenAI lifecycle changes

Exact symptoms and migration actions, linked to the official platform documentation used for verification.

OpenAIOpenAI APIcritical

OpenAI Assistants API shuts down on August 26, 2026

OpenAI is removing the Assistants API and directs developers to the Responses API and Conversations API.

api sunsetInventory Assistants and Threads SDK usage, map it to Responses and Conversations, migrate stored state, and run end-to-end tool and conversation tests before August 26.
OpenAIOpenAI APIcritical

Four legacy OpenAI models shut down on September 28, 2026

OpenAI is removing four older GPT and base-model IDs and recommends GPT-5.4 mini or GPT-5 mini.

model shutdownReplace the retired model ID with an official recommended model, update the API request shape where required, and regression-test prompts and outputs.

Official OpenAI source coverage

Change Radar monitors 2 first-party OpenAI documentation pages using a dedicated lifecycle ledger. These are the source pages used to qualify lifecycle records for publication.