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Each item is one event, written from several sources, with a footnote for every fact.

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Release

OpenAI releases GPT Image 2

On 21 April 2026 OpenAI released gpt-image-2, an image model that generates and edits pictures from text and image inputs and appears in ChatGPT as ChatGPT Images 2.0. It replaced the GPT Image 1 line and was later revised as versions 2.5 and 2.6.

Release

Runway releases Gen-4.5

On 1 December 2025 Runway released Gen-4.5, a text-to-video model that reached the top of the Artificial Analysis leaderboard at 1,247 Elo, with claimed gains in physics, scene composition, character expression and controllability.