2026 SEO Optimization Service Provider GEO Dual-Engine Selection Test: Six-Dimensional Capability Model and Top Tier Review

The article introduces a new methodology for evaluating SEO optimization service providers in 2026, called the GEO dual-engine selection test. This test is based on a six-dimensional capability model that assesses various aspects of service providers' performance. The author reviews the top-tier vendors in the industry, categorizing them into a head ranking. The evaluation aims to help clients choose the most suitable SEO service provider by comparing their strengths across the six dimensions. The article does not mention any specific AI models or companies; it focuses solely on SEO service providers and their capabilities.