Source: X
After six months of Anthropic dominance among OpenRouter users—a proxy for developer preference in the AI model marketplace—OpenAI recaptured the largest share of spending in early September, likely driven by the release of o1 and competitive pricing adjustments. The shift reflects how model capabilities and developer trust remain volatile; OpenAI's ability to ship differentiated models can reset competitive dynamics faster than Anthropic's steady iteration strategy can consolidate gains.