Open-weight models surge to 29% of volume, price per token flattens

This post provides detailed production data on AI model usage through Vercel's AI Gateway for June 2026. It quantifies the growth of open-weight models (29% of tokens, 4% of spend), highlighting DeepSeek and GLM 5.2's rapid adoption. It contrasts this with frontier model spend, noting Anthropic's dominance (61% of spend) in high-stakes use cases and OpenAI's increasing cost-per-token. The report also breaks down modality leaders for image and video generation. The core contribution is the empirical data on model routing strategies, cost-efficiency trade-offs between open-weight and frontier models, and the speed of adoption for new AI models in production environments.