OpenAI surpasses Anthropic in Q3 enterprise growth, 82% to 76%

OpenAI posted 82% quarter-over-quarter enterprise growth in Q3 2026, edging past Anthropic’s 76% clip and flipping a rivalry that looked settled just months ago. The data, drawn from Ramp token-spend tracking across US businesses, captures a dramatic reversal for a company that trailed Anthropic by double digits in enterprise market share as recently as late 2025. The catalyst is straightforward: OpenAI’s GPT-5.6 Sol, launched June 26, landed well with developers. Anthropic’s Claude Fable 5, launched earlier on June 9, ran headfirst into a US government-mandated access suspension three days later. One product shipped cleanly. The other spent nearly three weeks offline during a critical adoption window. How the gap closed Rewind to December 2025 and the picture looked very different. Menlo Ventures pegged Anthropic at 40% of enterprise LLM spend versus OpenAI’s 27%. Anthropic had built a reputation as the serious enterprise option, the model you brought to the boardroom while OpenAI dominated consumer chatbots. That calculus started shifting when OpenAI’s enterprise revenue overtook its consumer revenue in 2026. GPT-5.6 Sol scored between 88.8 and 91.9 on Terminal-Bench 2.1, a codin...