v1155+srv584.web409
## Threads ### Resolved Issues - Fixed: Sending messages to models older than GPT-5.4 may fail because the Responses API rejects inputs with phase set to `None` when the model is ineligible.
## Threads ### Resolved Issues - Fixed: Sending messages to models older than GPT-5.4 may fail because the Responses API rejects inputs with phase set to `None` when the model is ineligible.