As of mid-August 2026, OpenAI is closing the gap with Anthropic among Ramp’s business customers, posting a quarter-over-quarter growth rate of 82 compared to Anthropic’s 76. Between May 2025 and July 2026, Anthropic quadrupled its market share, rising from 9% to 43.5% of Ramp’s tracked US business customers, temporarily overtaking OpenAI at 39.7%. OpenAI’s GPT-5.6 Sol model accounts for 25% of tokens and 23% of corporate spend, while Anthropic’s Fable 5 represents just 6% of tokens and 11.4% of spend. Ramp’s AI Index uses actual corporate card transaction data to measure adoption, suggesting that while Anthropic attracts more companies, OpenAI achieves deeper integration into workflows. Regulatory hurdles around Fable 5 pricing may have slowed Anthropic’s growth, while fluid AI budgets are prompting businesses to reallocate spending toward the most effective models.
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