Step 1
Search beyond the obvious model string
Check application code, environment variables, templates, fixtures, provider adapters, and shared defaults. A single stale alias can leave a production path exposed.
October 23 shutdown
gpt-4-turbo shuts down October 23, 2026. Find every dependency before it does.
OpenAI lists gpt-4-turbo, gpt-4-turbo-2024-04-09, and gpt-4-turbo-completions for shutdown on October 23, 2026 and recommends gpt-5.6-sol.
What to check
Step 2
Migrate to the documented replacement
OpenAI’s current deprecation table recommends gpt-5.6-sol. Confirm the endpoint and request shape supported by the target workload before rollout.
Step 3
Replay production-like requests
Compare task quality, tools, structured output, latency, token usage, and failure handling. A request that returns 200 is not enough evidence that the migration is safe.
Sunset is designed to find scheduled shutdown identifiers across the repository so you can prioritize the highest-risk references first.
Check the rest of the repository
Fixing the first error does not prove the rest of the codebase is clear. Sunset scans source text for scheduled OpenAI shutdown risk and shows severity before you pay.