LLM inference Startups

Featherless.ai grew from a pricing experiment into a $3.6M ARR business serving 10,000 customers in under two years without paid marketing. By focusing on open source LLM inference and supporting 6,700 models (versus competitors' 100), they help startups cut their OpenAI and Anthropic bills in half. A $20M Series A in December 2025 provided the infrastructure capacity needed to scale their operations.