← ChatGPT & Codex changelog

OpenAI API — April, 2025

This comprehensive release includes a new gpt-image-1 model and two advanced o-series reasoning models (o3, o4-mini) for math, science, coding, and visual tasks. Significant additions are gpt-4.1 models (including mini and nano variants) with improved instruction following, coding, and an expanded 1M token context window, with gpt-4.1 and gpt-4.1-mini available for supervised fine-tuning. Further enhancements include API budget alerts, auto-recharge limits, and the new Codex CLI for code generation. Users of gpt-4.5-preview should note its announced deprecation.

Added

  • Launched support for Enhanced API Budget Alerts & Auto-recharge Limits.
  • Added a new image generation model, gpt-image-1. This model sets a new standard for image generation, with improved quality and instruction following.
  • Updated the Image Generation and Edit endpoints to support new parameters specific to the gpt-image-1 model.
  • Added two new o-series reasoning models, o3 and o4-mini. They set a new standard for math, science, and coding, visual reasoning tasks, and technical writing.
  • Launched Codex, our code generation CLI tool.
  • Added gpt-4.1, gpt-4.1-mini, and gpt-4.1-nano models to the API. These new models feature improved instruction following, coding, and a larger context window (up to 1M tokens). gpt-4.1 and gpt-4.1-mini are available for supervised fine-tuning. Announced deprecation of gpt-4.5-preview.