GPT-2 1.5B Full Release Completes OpenAI's Staged Release Experiment
OpenAI released the full 1.5B parameter GPT-2 model along with code and weights, completing its staged release process that began earlier in 2019. The release also includes tooling to help detect GPT-2 outputs. OpenAI frames this as a test case for responsible staged release practices for future powerful models, acknowledging that larger models had already been released by others in the interim.
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GPT-2: 6-Month Follow-Up — 774M Parameter Model Released
OpenAI released the 774 million parameter version of GPT-2 as part of its staged release strategy, following the 124M model in February and 355M model in May 2019. The release is accompanied by an open-source legal agreement to facilitate model-sharing partnerships between organizations. OpenAI also published a technical report on coordinating with the AI research community around publication norms and staged disclosure practices.
GPT-4 Release
OpenAI released GPT-4, a large multimodal model accepting image and text inputs and producing text outputs. The model demonstrates human-level performance on various professional and academic benchmarks. It represents OpenAI's latest milestone in scaling deep learning.
Introducing GPT-5.4
OpenAI has released GPT-5.4, described as their most capable and efficient frontier model targeting professional work. The model features state-of-the-art coding, computer use, and tool search capabilities, along with a 1 million token context window. This represents a significant capability and efficiency advancement over prior GPT-5 series models.
Introducing GPT-5.2
OpenAI has released GPT-5.2, described as their most advanced frontier model for professional use, featuring state-of-the-art reasoning, long-context understanding, coding, and vision capabilities. The model is available through ChatGPT and the OpenAI API. It is positioned to support faster and more reliable agentic workflows.
Introducing GPT-5.5
OpenAI has announced GPT-5.5, described as their most capable model to date, with improvements in speed and reasoning targeted at complex tasks including coding, research, and data analysis. The announcement positions GPT-5.5 as a step beyond GPT-5 in OpenAI's model lineage. The blog post is brief and announcement-level, with limited technical detail provided at this stage.
OpenAI Releases GPT-5.2 System Card Update
OpenAI has published a system card update for GPT-5.2, the latest model family in the GPT-5 series. The safety mitigation approach is described as largely consistent with the prior GPT-5 and GPT-5.1 system cards. Training data sources follow the same pattern as other OpenAI models: publicly available internet data, third-party partnerships, and user/researcher-generated content.
OpenAI GPT-4.5 System Card
OpenAI has released a research preview of GPT-4.5, described as their largest and most knowledgeable model to date. The system card accompanies the model release, providing safety evaluations and capability documentation. This represents a significant step in OpenAI's model scaling trajectory between GPT-4 and any future GPT-5 release.
Better language models and their implications
OpenAI announced GPT-2, a large-scale unsupervised language model capable of generating coherent multi-paragraph text and achieving state-of-the-art performance on language modeling benchmarks. The model demonstrated zero-shot capability across reading comprehension, machine translation, question answering, and summarization without task-specific fine-tuning. OpenAI notably withheld the full model release citing misuse concerns, marking an early high-profile instance of staged/responsible release policy.