GPT-5.6 Sol sits at the top of OpenAI's GPT-5.6 family as a flagship release built for difficult professional work, with a design focus on coding agents, long research, computer use, cybersecurity, science, design, and workflows that have to coordinate several tools. It is accessed through the developer identifier gpt-5.6-sol, while the shorter gpt-5.6 alias currently routes to the same Sol variant. That positioning frames Sol as a generalist specialist rather than a narrow task model, suitable for organizations that need one backbone across engineering, research, and operational tooling.

In practical terms, Sol offers a very large working window with up to the listed price,050,000 tokens of that quick-info value and the cataloged API limit tokens of output, which lets it ingest sizable codebases, long documents, or extended agent traces in a single session. Standard short-context pricing of five dollars per million input tokens and thirty dollars per million output tokens keeps the model accessible for routine workloads, while the multimodal input surface lets teams attach text, images, and PDFs alongside reasoning, tool calling, and structured output. The combination of a million-token that quick-info value, multi-tool reasoning, and attachment support makes Sol a natural fit for agentic pipelines, deep research assistants, and enterprise workflows where one model has to plan, call tools, and produce structured results end to end.