GPT-6.1 Sol delivers near-Astra performance at a lower cost for complex coding, computer use, and professional work. Compare it with Astra on your tasks to assess the tradeoff between quality and cost.
reasoning.effort supports low, medium (default), high, xhigh, and
max. The none and minimal reasoning efforts are not supported.
Use the Responses API for tool calling. Chat Completions is supported without tool calling.
For the fastest response speeds, use Ultrafast mode
with model: "gpt-6.1-sol" and service_tier: "ultrafast" in the Responses API.
GPT-6.1 Sol supports US and EU data residency, including with Fast and Ultrafast modes. See data residency eligibility.
See GPT-6.1 Sol in the GPT-6 guide and model-selection guidance.