# Claude Agent SDK vs Codex CLI

Codex CLI is open source and Claude Agent SDK is not, so the question is whether you want source access and the option to fork, or would rather have a vendor accountable for it.

| | Claude Agent SDK | Codex CLI |
| --- | --- | --- |
| Licence | Proprietary | Open source |
| Pricing | usage based | paid |
| Self-hostable | No | No |
| Languages | TypeScript, Python | Any language |
| Install | npm install @anthropic-ai/claude-agent-sdk | npm install -g @openai/codex |
| Keys required | ANTHROPIC_API_KEY | OPENAI_API_KEY |

## Full pages

- https://newagent.build/c/claude-agent-sdk
- https://newagent.build/c/codex-cli

## Machine interfaces

- `GET https://newagent.build/api/registry` — every component as JSON
- `GET https://newagent.build/api/vendors` — vendors, with the repo and releases feed to watch
- `GET https://newagent.build/api/advise?q=<plain english>` — recommended stack for a description
- `GET https://newagent.build/api/stack?<layer>=<id>&format=sh|json|md|yml|agents|env` — a stack as files
- `GET https://newagent.build/llms.txt` — the whole registry in one fetch

Any page here also returns markdown if you send `Accept: text/markdown`.