openrouter

OpenRouter

One interface to hundreds of AI models with prices side by side, including a set of free models you can use without a subscription.

From the site: The unified interface for every model. Find the best models & prices for your prompts

Why I recommend it: Free to sign up and there are free models on the list; paid models are pay-as-you-go with no subscription.

OpenRouter Cookbook: Create an Agent Harness (TUI)

Free OpenRouter developer guide walking through building a terminal-based agent harness — tool calls, loops and model routing — with working code you can adapt.

Why I recommend it: Building a small agent harness yourself is one of the clearest portfolio projects for AI-adjacent roles right now.