Best free AI courses (2026)

The best free AI courses in 2026 cluster around three sources: Anthropic and OpenAI's own vendor-published tutorials (interest-aligned with the vendor — useful but single-vendor), DeepLearning.AI's short courses (mostly free, broad coverage, taught by the actual framework authors), and Coursera's "audit" mode (free access to content, paid only for certificates). Outside these, the field is mostly free-trial-then-paywall — useful for the trial, less useful as durable resources.

Pick by where you are: zero-to-fluent on prompting starts with Anthropic's tutorial. Build-an-agent starts with the LangGraph short course. LLM internals starts with the Coursera Generative-AI-with-LLMs audit.