Anthropic went from $1 billion in revenue to $30 billion in 15 months. Their growth rate is 10x per year. OpenAI's is 3-4x. Software companies don't do this. ServiceNow crossed $1 billion in revenue in 2015 and took nearly a decade to reach $10 billion. Snowflake crossed $1 billion in 2021 and is at roughly $4 billion today. Zoom, during a pandemic that put half the planet on video calls, grew 4x in its best year and has never matched that pace since. The entire SaaS playbook was built on the assumption that growth settles into the 40-60% band once you cross a billion in revenue. Rule of 40. Every Series D board deck uses the same math. Anthropic tripled in a single quarter. The engine is coding. Claude Code alone is at $2.5 billion in annualized revenue. Cursor, Replit, and Windsurf all default to Claude as their coding backbone. Eight of the Fortune 10 are now Anthropic customers. Over 500 customers spend more than $1 million a year, up from a dozen two years ago. Engineers aren't buying "AI." They're buying one specific model family because it one-shots refactors that everything else fumbles. The differential is the part nobody's running. A company growing 10x chasing a company growing 3-4x closes the gap fast, even when it starts behind. The growth rate ratio is roughly 2.5x to 3x. The last-round valuation ratio is 2.2x: Anthropic at $380 billion, OpenAI at $852 billion. The growth curve is already steeper than the valuation gap. VCs have already noticed. Anthropic is currently fielding offers at $800 billion and turning them down. That's the market saying the 4x company and the 10x company are converging on valuation before anyone's priced the revenue. Revenue catches up fast when the multiplier is 10.