OpenAI o1 and new tools for developers

OpenAI released o1 in the API, updated the Realtime API, added Preference Fine-Tuning, and shipped beta Go/Java SDKs; o1 is rolling out first to usage tier 5 developers. Disclosed details include 60% fewer reasoning tokens than o1-preview on average, and a 60% GPT-4o audio price cut in Realtime API to $40/1M input and $80/1M output tokens. The key shift is production support for function calling, Structured Outputs, developer messages, vision, and a reasoning_effort parameter; the post is truncated, so some GPT-4o mini realtime pricing details are not disclosed here.

Why it matters: This is a substantive OpenAI developer release: o1 reaches the API with function calling, Structured Outputs, vision, and developer messages, which materially improves production readiness. HKR-H/K/R all pass; the excerpt includes concrete token and pricing data, but later GPT-4o