Migrate three OpenAI API model IDs before the April 2027 shutdown
OpenAI’s API deprecation notice gives teams using gpt-5.3-codex , gpt-5.1 , or gpt-5.4-nano until April 1, 2027, before those model IDs are removed. The listed replacements are gpt-6-sol for the first two and gpt-6-luna for gpt-5.4-nano . Treat that date as a migration deadline, not as a reason to replace every model reference in one pull request. A safer sequence is: find every configured ID,…
OpenAI is set to deprecate the gpt-5.3-codex, gpt-5.1, and gpt-5.4-nano API model IDs by April 1, 2027. Replacements are gpt-6-sol for the first two models and gpt-6-luna for the third. It is recommended to migrate before the deadline. To do so, locate every configured ID, test the options, then migrate traffic in stages. Start by searching the repository and other deployment configurations.
Additionally, check environment variables, secret-manager values, scheduled jobs, and database entries. Record each discovery, noting the service, environment, owner, current model, and fallback behavior. Centralize default and replacement IDs to avoid carrying choices in each individual route. Build a test set from real workloads to ensure the replacement meets the application's actual needs.
Compare the current and recommended models using the same inputs, instructions, and settings. Evaluate based on task completion, schema validity, code-test pass rate, reviewer corrections, refusal behavior, latency, and cost. Roll out one task family at a time, starting in a non-production environment with a small, synthetic or approved test set.
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