It changed quite a bit - we got new model IDs to test every few days. They did tell us when the model was "frozen", and I ran my final tests against those IDs.
OpenAI and Anthropic don't update models without changing their IDs, at least for model IDs with a date in them.
OpenAI do provide some aliases, and their gpt-5-chat-latest and chatgpt-4o-latest model IDs can change without warning, but anything with a date in (like gpt-5-2025-08-07) stays stable.
OpenAI and Anthropic don't update models without changing their IDs, at least for model IDs with a date in them.
OpenAI do provide some aliases, and their gpt-5-chat-latest and chatgpt-4o-latest model IDs can change without warning, but anything with a date in (like gpt-5-2025-08-07) stays stable.