8OpenAI Blog·
OpenAI releases GPT-5.6, a new frontier model
OpenAI announced GPT-5.6, a new flagship model positioned as offering more intelligence per token, stronger performance per dollar, and increased capability for demanding tasks. The release is framed around efficiency and scalability alongside raw capability. This supersedes GPT-5.5 as OpenAI's current flagship.
Related guides (4)
Related events (8)
OpenAI releases GPT-5.6
OpenAI has released GPT-5.6, a new version of their flagship model series. The item surfaces via Hacker News with high engagement (850 points, 626 comments), indicating significant community interest. The source URL points to an official OpenAI announcement page, suggesting this is a primary release event.
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.
Introducing GPT-5
OpenAI has released GPT-5, described as its most capable AI system to date. The model claims state-of-the-art performance across a broad range of domains including coding, mathematics, writing, health, and visual perception. The announcement positions GPT-5 as a significant intelligence leap over all prior OpenAI models.
OpenAI previews GPT-5.6 Sol, a next-generation model
OpenAI has announced a preview of GPT-5.6 Sol, described as a next-generation model. The announcement originates from OpenAI's official index page, surfaced via Hacker News with 664 points and 406 comments, indicating significant community interest. This represents a new model release beyond the current GPT-5.5 flagship, advancing OpenAI's model lineage.
OpenAI releases GPT-5.5 and GPT-5.5 Pro to the API with 1M token context and built-in agentic tools
OpenAI released GPT-5.5 and GPT-5.5 Pro to the Chat Completions and Responses API, positioning them as frontier models for complex professional work and compute-intensive tasks respectively. GPT-5.5 supports a 1M token context window, image input, structured outputs, function calling, built-in computer use, hosted shell, MCP, web search, and Skills. Notable behavioral changes include reasoning effort defaulting to medium and extended-only prompt caching support.
OpenAI releases GPT-5.6 model family with Sol, Terra, and Luna tiers
OpenAI has launched GPT-5.6, a new flagship model family available across ChatGPT, Codex, and the API, with a global rollout completing within 24 hours. The family includes three tiers: GPT-5.6 Sol (frontier capability), GPT-5.6 Terra (balanced), and GPT-5.6 Luna (high-volume efficiency). The release introduces several new API capabilities including Programmatic Tool Calling, explicit prompt caching controls, persisted reasoning, max reasoning effort, Pro mode, and multi-agent orchestration in beta via the Responses API. Image input now accepts original dimensions with configurable detail settings.