Vercel AI Gateway Index: Open-Weight Models Hit 71.5% of Tokens as Anthropic Spend Share Drops Below Half
Vercel's October 2026 AI Gateway Production Index shows open-weight models now process 71.5% of tokens and claim 23% of spend — quadruple June's share — while Anthropic's overall spend share fell below 50% for the first time. Nearly one in three teams changed their most-used lab in September, an index record.