How to Build Your Own AI: The Complete 2025 Guide to Costs, Tools, and Making Money
OpenAI’s GPT-4 and Meta’s LLaMA 2 both launched in 2023, with LLaMA 2 weights available for commercial use. Anthropic’s Claude 2 offers a 100,000-token context window at about half the per-token cost of GPT-4. Midjourney reported $200 million in annual revenue and 21 million Discord members by 2023. ChatGPT reached 100 million users in two months after launch; Microsoft invested billions in OpenAI.