How to Build Your Own AI: The Complete 2025 Guide to Costs, Tools, and Making Money
OpenAI’s GPT-4, released in 2023, is a proprietary multimodal model (text and images) available via API or Azure and handles a few thousand input tokens by default. Anthropic’s Claude 2 offers a 100,000-token context window and is accessible via API, with prompting costs roughly half of GPT-4 per token. Meta’s LLaMA 2, released in 2023, comes in 7B, 13B, and 70B parameter sizes; weights are downloadable and commercial use is allowed under a permissive license with minor restrictions. Mistral 7B, a 7.3B parameter model released in 2023, is Apache 2.0 licensed and can run on a single GPU, reportedly outperforming