Compare AI tools

	Cline A	Claude Code S	Gemini A	Claude Agent SDK S
Tagline	Open-source VS Code agent. Reads + writes + runs.	Anthropic's CLI agent. Opus-powered, operates on your repo directly.	Google's answer. Best integrated with Workspace + free for a lot.	Anthropic's SDK for building your own agents on Claude.
Category	Coding	Coding	Chatbots	Agents
Pricing	Free (open source) + your API costs	Part of Claude Pro/Max/Team plans	Free + $20/mo Advanced (bundled with 2TB Drive)	API usage + SDK is free
Best for	VS Code users who want agentic coding without changing IDEs.	Developers who want an agent, not autocomplete. Large refactors, tests, docs.	Anyone already on Google, research tasks, summarizing long documents.	Developers building custom agents for their own company/product.
Strengths	Free extension for VS Code Plan + Act modes Model-agnostic (Claude, GPT, local) Sees terminal output and iterates	Runs locally, edits your actual files Strong on large codebases with 1M context Great at multi-step tasks	Native Google Workspace integration Very long context (1M+) Deep Research feature Free tier is generous	Production-grade agent primitives Built on Claude (best reasoning) Full control — build exactly what you need
Weaknesses	Can burn tokens fast if not watched Less polished than Cursor	Terminal-based — learning curve Can't be used without Claude subscription	Writing quality trails Claude Over-refusals on edge content UI is cluttered	Developer-only You build the UI
Kai's verdict	A-tier. Best free agentic option in VS Code. Use with Claude for best results.	S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.	A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.	S-tier for builders. The right primitives. What Kai is built on under the hood.
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