← ChatGPT & Codex changelog

OpenAI API — June, 2025

This release delivers substantial advancements in performance, model capabilities, and cost efficiency. Notable features include Priority processing for significantly lower and more consistent latency, alongside the powerful o3-pro model for enhanced reasoning on difficult problems. New specialized deep research variants of the o-series models, o3-deep-research and o4-mini-deep-research, offer optimized tools for extensive analysis. Additional enhancements cover fine-tuning support with Direct Preference Optimization, reusable prompts, async event handling with webhooks, and general price reductions for the o3 model and web search tool. These updates provide developers and researchers with faster, more intelligent, and cost-effective solutions.

Added

  • Launched support for Priority processing. Priority processing delivers significantly lower and more consistent latency compared to Standard processing while keeping pay-as-you-go flexibility.
  • Released o3-deep-research and o4-mini-deep-research, deep research variants of our o-series reasoning models optimized for deep analysis and research tasks. Learn more in the deep research guide.
  • Added support for async event handling with webhooks. Reduced and simplified pricing for the web search tool. Added support for the web search tool.
  • New reusable prompts are now available in the dashboard and Responses API. Via API, you can now reference templates created in the dashboard via the prompt parameter (with a prompt id, optional version) and supply dynamic variables that can include strings, images, or file inputs. Reusable prompts are not available in Chat Completions. Learn more.
  • Released o3-pro, a version of the o3 reasoning model that uses more compute to answer hard problems with better reasoning and consistency. Prices for the o3 model have also been reduced for all API requests, including batch and flex processing.
  • Added fine-tuning support with direct preference optimization for the models gpt-4.1-2025-04-14, gpt-4.1-mini-2025-04-14, and gpt-4.1-nano-2025-04-14.
  • New model snapshots available for gpt-4o-audio-preview and gpt-4o-realtime-preview. Released Agents SDK for TypeScript.