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

Short summary

Vercel's AI Gateway Production Index for June 2026 shows open-weight models surging to 29% of token volume on just 4% of spend, driven largely by DeepSeek. Average price per token stayed flat as cheap open-weight volume offset a 12% rise in frontier model prices. Anthropic holds 61% of spend despite only 32% of tokens, dominating high-stakes use cases like coding agents. New entrant GLM 5.2 grew 50x in daily volume within two weeks of launch.

• •Open-weight models hit 29% of token volume on under 4% of spend, nearly tripling since April
• •DeepSeek is now the third-largest token source at 22.6%, closing in on Google
• •Anthropic dominates spend at 61% and holds 72%+ of high-stakes use cases like coding agents
• •GLM 5.2 launched mid-June and grew 50x in daily volume by month-end

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