Compare AI tools

	Claude Code S	Claude Agent SDK S	Leonardo.ai A	OpenRouter S
Tagline	Anthropic's CLI agent. Opus-powered, operates on your repo directly.	Anthropic's SDK for building your own agents on Claude.	Gamer + creator image gen with model fine-tuning built in.	One API, every model. Pay-as-you-go, no subscriptions.
Category	Coding	Agents	Image	Dev Platform
Pricing	Part of Claude Pro/Max/Team plans	API usage + SDK is free	Free + $12-$60/mo	Pay per token — model-dependent
Best for	Developers who want an agent, not autocomplete. Large refactors, tests, docs.	Developers building custom agents for their own company/product.	Indie game devs, illustrators, anyone training custom style models.	Developers experimenting across models. Apps that want fallback logic.
Strengths	Runs locally, edits your actual files Strong on large codebases with 1M context Great at multi-step tasks	Production-grade agent primitives Built on Claude (best reasoning) Full control — build exactly what you need	Train your own models on your style/character Great for game art + concept art Generous free tier	300+ models from one endpoint Automatic fallbacks between providers No subscription — just pay what you use
Weaknesses	Terminal-based — learning curve Can't be used without Claude subscription	Developer-only You build the UI	General output behind Midjourney Can be overwhelming	Slight markup over direct API Some provider features not exposed
Kai's verdict	S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.	S-tier for builders. The right primitives. What Kai is built on under the hood.	A-tier for creators training custom looks. B-tier for general use.	S-tier for model-shopping. I use this for every prototype before committing.
Link	Open →	Open →	Open →	Open →