GPT-6.1 Sol

GPT-6.1 Sol is an OpenAI model in the GPT family and the "Sol" line. OpenAI positions it as a variant delivering near-flagship (GPT-6 Astra) performance at a lower cost, focused on complex coding, computer use and professional work. It is a point revision (6.1) of GPT-6 Sol, whose line debuted on September 22, 2026.

Specifications

The model supports a 1,050,000-token context window (up to 922,000 input tokens and up to 128,000 output tokens). Its knowledge cutoff is April 30, 2026. It accepts text and image input and produces text output. It exposes a configurable reasoning effort level: low, medium (default), high, xhigh and max.

Availability and features

GPT-6.1 Sol is available via the OpenAI API (Chat Completions and the Responses API, including Batch). It supports streaming, structured outputs, function calling, file search, image input, web search and prompt caching, along with tools such as web search, file search, image generation, code interpreter, hosted shell and computer use. It is not available on the Live, Realtime or Assistants endpoints.

Pricing

Public API pricing is USD 2 per 1M input tokens, USD 0.10 per 1M cached input tokens, USD 2.50 for cache writes and USD 10 per 1M output tokens. For requests exceeding 272,000 tokens, input and cache rates double and output rates increase by 50%.