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April, 2025

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Apr 14
  • 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). Announced deprecation of gpt-4.5-preview.

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March, 2025

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Mar 20
  • Added gpt-4o-mini-tts, gpt-4o-transcribe, gpt-4o-mini-transcribe, and whisper-1 models to the Audio API.
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Mar 19
  • Released o1-pro, a version of the o1 reasoning model that uses more compute to answer hard problems with better reasoning and consistency.
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Mar 11
  • 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.
  • 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).
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Mar 03
  • Added metadata field support to fine-tuning jobs.

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February, 2025

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Feb 27
  • Released GPT-4.5, our largest and most capable chat model yet. GPT-4.5’s high “EQ” and understanding of user intent make it better at creative tasks and agentic planning.

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January, 2025

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Jan 31
  • Launched o3-mini, a new small reasoning model that is optimized for science, math, and coding tasks.