[OpenAI Astra Suspected to Have Entered API Backend: Model ID Changed from 400 to 404] Beating AI Newsflash: The OpenAI Responses API has started returning a 404 'Not Found' error for the suspected Astra model ID gpt-6-astra. Previously, entering a non-existent model name would return a 400 error, but gpt-6-astra now results in a 404. Based on the error code differences in the OpenAI API, this suggests that the model ID has likely entered the backend but is not yet publicly available. A similar signal was observed earlier with Anthropic Fable 5.1. Before its launch on AWS Bedrock, its model ID also changed from 400 to 404, followed by an official release. However, gpt-6-astra may not be the final name. According to *The Information*, OpenAI had previously considered naming Astra as GPT-6 but later abandoned the idea. [Original Link]