OpenAI Surpasses Anthropic in Q3 Enterprise Growth Amid IPO Uncertainties

OpenAI achieved an impressive 82% quarter-over-quarter enterprise growth in Q3 2026, surpassing Anthropic's 76% growth rate. This shift marks a significant turnaround for OpenAI, which had previously lagged behind Anthropic in market share.

The data, sourced from Ramp token-spend tracking across U.S. businesses, highlights a reversal in fortunes for OpenAI, driven largely by the successful launch of its GPT-5.6 Sol model on June 26, 2026. In contrast, Anthropic's Claude Fable 5, launched shortly before on June 9, faced a government-mandated access suspension just days later, hindering its adoption during a critical period.

Market Dynamics and Valuations

In December 2025, Anthropic was estimated to control 40% of enterprise LLM spending, while OpenAI held 27%. However, as of 2026, OpenAI's enterprise revenue has overtaken its consumer revenue, signaling a shift in market dynamics. The pricing structure for OpenAI's model also offers a competitive edge, with lower costs per million tokens compared to Anthropic's offerings.

Both companies remain privately held, with Anthropic's valuation at approximately $965 billion following its Series H funding round in May 2026, while OpenAI recently completed a $122 billion funding round, setting a record for private companies.

Implications for IPO Plans

OpenAI's recent decision to pause its IPO plans has raised questions about the timing and prospects of Anthropic's own public offering, which had been anticipated following their confidential filing in June 2026. Market observers are keenly watching for any updates from Anthropic regarding potential adjustments to their IPO timeline, especially in light of regulatory and market conditions that may affect both companies.