Get an API key
Generate a key on H Platform and export it. The free tier needs no credit card. Add credits for higher limits and the paid models:
holo4-27b, holo4-35b-a3b, and holo3-122b-a10b. The examples below use holo4-27b; on the free tier, set model to holo3-1-35b-a3b.Install the OpenAI client
The API is OpenAI-compatible, so the official client works as is. Only the
base_url changes.Send a screenshot
Point the client at H, then send an image and a question.Images can be a URL or a base64 data URI. Swap
model for any ID on the Models page, or list what your key can reach with GET /v1/models.Next steps
Build an agent
Multi-turn. Conversation and observations in, the next tool call out.
Cookbooks
Runnable agents for a browser, a code runner, and MCP servers.
Element localization
Single-turn. A screenshot and a target description in, click coordinates out.
Document OCR
Single-turn. A page image in, its full text out.
API reference
Endpoints, request and response shapes, errors, and rate limits.
Local inference
Run the open weights on your own hardware.