OpenAI API — March, 2025

March 1, 2025

This release marks a significant step towards advanced agentic workflows. Key additions include the new Responses API for creating and using agents and tools, an Agents SDK for orchestration, and built-in tools like web and file search. Developers benefit from expanded Audio API models (gpt-4o-mini-tts, transcribe, whisper-1) and the o1-pro model for enhanced reasoning. Fine-tuning jobs now support metadata for better organization. Future plans include transitioning Assistants API features to the Responses API by 2026.

Added

Added gpt-4o-mini-tts, gpt-4o-transcribe, gpt-4o-mini-transcribe, and whisper-1 models to the Audio API.
Released o1-pro, a version of the o1 reasoning model that uses more compute to answer hard problems with better reasoning and consistency.
Released several new models and tools and a new API for agentic workflows:
Released the Responses API, a new API for creating and using agents and tools.
Released a set of built-in tools for the Responses API: web search, file search, and computer use.
Released the Agents SDK, an orchestration framework for designing, building, and deploying agents.
Announced new models: gpt-4o-search-preview, gpt-4o-mini-search-preview, computer-use-preview.
Added metadata field support to fine-tuning jobs.

Changed

Announced plans to bring all Assistants API features to the easier to use Responses API, with an anticipated sunset date for Assistants in 2026 (after achieving full feature parity).