OpenAI has launched GPT-4.1, a new family of generative multimodal AI models that can handle 1 million tokens of context. This release includes three versions: GPT-4.1, GPT-4.1 mini, and GPT-4.1 nano, with the latter being described as the smallest and fastest model. Improvements from GPT-4.1 will be integrated into ChatGPT, while the previous model, GPT-4, will be phased out by April 30th.

OpenAI has launched GPT-5 along with three variants—GPT-5 Pro, GPT-5 mini, and GPT-5 nano—now accessible to all ChatGPT users, including free tiers. The new model boasts improved coding capabilities, reduced confabulations, and a novel approach to handling sensitive requests, while also introducing simulated reasoning for better accuracy in complex queries. Although the advancements are notable, some perceive GPT-5 as an incremental upgrade compared to previous models in the series.

OpenAI is considering reintroducing the older ChatGPT model 4o for Plus subscribers after user backlash against the newly released GPT-5 model, which many found less friendly and conversational. CEO Sam Altman acknowledged the feedback during a Reddit AMA and noted the rollout of GPT-5 faced unexpected issues.

OpenAI has released two new models, o3 and o4-mini, which integrate simulated reasoning with full access to various tools including web browsing and coding functionalities. These models are designed for different use cases, with o3 focusing on complex analysis and o4-mini optimizing for speed and cost efficiency, marking a significant advancement in ChatGPT’s capabilities. Access to these models is being rolled out to various user tiers, with enhanced features for developers through the Chat Completions API and Responses API.