Welcome to Halfbill
Halfbill gives you Anthropic Claude and OpenAI GPT models at half the vendor list price. Use them in Halfbill Chat or in your own tools with one key.
What is Halfbill?
Halfbill lets you use the same Claude and GPT models you would get from Anthropic and OpenAI, for less money. You pay from a prepaid balance (or a monthly plan), and you use the models either in our web chat or inside your own tools: Claude Code, Cursor, and anything built on the OpenAI or Anthropic SDKs. You do not need an OpenAI or Anthropic account.
Pick your path
I just want to use AI
No coding. Create an account, add a few dollars of credit, and chat with Claude and GPT in your browser or connect a coding assistant by following the steps.
Start hereI'm a developer
Keep your SDK. Change the base URL and the key, pick a model id, and your first request works in three steps.
Open the quick startCommon tasks
Get credits
Prepaid balance, packs, bonuses, invoices.
Use the chat
Open Halfbill Chat and pick a model.
Connect Claude Code
Terminal assistant, set up step by step.
Connect Cursor
Point the Cursor editor at Halfbill.
Popular questions
- How does paying work? Credits or a subscription?
- Which model should I pick?
- What is a token, an API key, a base URL?
- It says "insufficient balance" or "invalid API key". What now?
- Where do I find invoices, and is VAT included?
- How can Halfbill be cheaper than the vendor?
- Which models and prices are current?
For developers
- Quick start — first request in three steps, with snippets for cURL, Python, TypeScript, the Anthropic SDK, Claude Code, and Cursor
- Overview — endpoints, models, and billing at a glance
- Pricing & billing — credits, top-up packs, and plans in detail
Halfbill is an independent service and is not affiliated with, endorsed by, or sponsored by OpenAI or Anthropic. Model names are trademarks of their respective owners.
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