Both are commercial model provider options with comparable terms, so the choice comes down to which model of the problem you prefer — compare the descriptions below rather than the licence.
GPT and o-series via the Responses API.
Claude and Gemini under GCP billing, IAM and regional controls.
| OpenAI | Google Vertex AI | |
|---|---|---|
| Licence | Proprietary | Proprietary |
| Pricing | usage based | usage based |
| Self-hostable | No | No |
| Languages | TypeScript, Python | TypeScript, Python |
| Install | npm install openai | — |
| Keys required | OPENAI_API_KEY | GOOGLE_CLOUD_PROJECT, GOOGLE_APPLICATION_CREDENTIALS |
Both are commercial model provider options with comparable terms, so the choice comes down to which model of the problem you prefer — compare the descriptions below rather than the licence. OpenAI: GPT and o-series via the Responses API. Google Vertex AI: Claude and Gemini under GCP billing, IAM and regional controls.
OpenAI is a hosted service only. Google Vertex AI is a hosted service only.
OpenAI is proprietary (usage based). Google Vertex AI is proprietary (usage based).
Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.
curl -s -H "Accept: text/markdown" https://newagent.build/compare/openai-vs-vertex