GPT-6.1 Sol (Medium)

GPT-6.1 Sol is a mid-tier reasoning language model developed by OpenAI as an upgrade to GPT-6 Sol. Positioned beneath the flagship GPT-6 Astra model within the GPT-6 family, it is engineered to deliver high-performance capabilities for complex professional tasks while offering an optimized balance of speed, capability, and cost-efficiency.

The model excels in agentic coding, computer use, and multi-step business workflow execution. By supporting flexible reasoning options ranging from low to maximum effort, developers can adjust the model's depth of analysis depending on project requirements. GPT-6.1 Sol accepts text and image inputs and supports a large context window of 1,050,000 tokens alongside a maximum output of 128,000 tokens, enabling it to process extensive codebases and dense document sets.

GPT-6.1 Sol approaches the performance level of the flagship GPT-6 Astra on various professional evaluations, including software engineering and document comprehension benchmarks, while operating at a fraction of the cost. It also integrates advanced context caching features to reduce expenses and latency for repetitive queries, making it suitable for large-scale production applications and automated agentic pipelines.