Released on March 5, 2026, this OpenAI frontier model merges the previously separate GPT and Codex lines into a single system, positioning itself as a strong default for both general-purpose tasks and software engineering workflows. Independent coverage describes it as designed around agentic behavior, with the ability to plan multi-step tasks, interact with computer interfaces, click and type through an agent layer, and execute complex workflows with fewer iterations. The model also emphasizes a substantial reduction in factual errors and more token-efficient reasoning compared to earlier generations, which makes it appealing for prolonged, multi-stage jobs rather than one-shot prompts.

Architecturally, the system pairs a roughly one-million-token context window with multimodal input handling, supporting text and image inputs alongside an output stream tuned for high-context reasoning, coding, document understanding, tool use, and instruction following. That combination lets it synthesize information across many sources and generate production-quality code within a single workflow. On the routing side, this listing is surfaced through a free tier on UnoRouter's unified API, which exposes 291-plus models across more than 50 upstream providers through a single key, including a catalog of free-suffixed entries. The practical fit is therefore a free, general-purpose OpenAI model aimed at developers who want long-context multimodal reasoning and coding without integrating multiple vendor keys.