Compare AI tools
Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Claude Agent SDK S | Runway S | |
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| Tagline | Anthropic's SDK for building your own agents on Claude. | The pro's AI video tool. Gen-4 is the current bar. |
| Category | Agents | Video |
| Pricing | API usage + SDK is free | Free + $15-$95/mo |
| Best for | Developers building custom agents for their own company/product. | Marketing video, pitch decks, b-roll, creative shorts. |
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| Kai's verdict | S-tier for builders. The right primitives. What Kai is built on under the hood. | S-tier. Market leader with reason. Start here for serious video. |
| Link | Open → | Open → |