OpenAI: GPT-5.6 Sol Pro
OpenAI's mid-tier model. Long-context specialist with 1.1M window.
Scores by test
Methodology →What you need to know
GPT-5.6 Sol Pro is optimized for high-precision reasoning and complex planning, achieving perfect 5/5 internal scores across agentic planning, strategic analysis, and creative problem solving. Its primary technical advantage lies in reliability, specifically in faithfulness and constrained rewriting, making it highly effective for tasks requiring strict adherence to source material or complex logic.
The model is priced at a premium, with a blended cost of $23.75/MTok. While it ranks 33rd overall among 130 models, the high cost is balanced by a massive 1.1M token context window and strong performance in tabular data and multilingual tasks. However, it shows relative weakness in safety calibration and is slightly less proficient in tool calling and structured output compared to its reasoning capabilities.
Use this model if your project requires high-fidelity agentic workflows, complex strategic analysis, or processing extremely large datasets within a single prompt. Skip this model if you are budget-constrained or require a model with tighter safety guardrails and superior structured output performance.
Strengths — Top 3
Relative weaknesses — Bottom 3
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