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Claude Code API setup and costs

Set the API address and key to use our models in Claude Code. Claude input and output start at 19% of list price; cache reads and writes use list prices.

~/.zshrc
export ANTHROPIC_BASE_URL=https://1zheai.com
export ANTHROPIC_AUTH_TOKEN=YOUR_API_KEY
Create an API key

Set up in three steps

  1. 1

    Create an API key

    Sign up, create an API key in the console and copy it.

  2. 2

    Set environment variables

    Choose the instructions for your operating system.

  3. 3

    Make your first call

    Run claude and send a message, then find the call in your usage log.

Setup, switching and API troubleshooting

Cost of one call

A Claude Code task usually includes several calls, each carrying the earlier context. This is a cost example for one call.

One Claude Code call
200 · 1840 ms
modelclaude-sonnet-5-5
Input
34,120
Cache read
94,310
Cache write
2,048
Output
4,215
List price$0.1249
Your priceSave 72%$0.0355
Illustration, not a real call. Input/output: list price × 0.19; cache at list price.

Claude Code questions

Set ANTHROPIC_MODEL=claude-sonnet-5-5 or switch with /model in Claude Code.

Other tools

Codex CLI
Call GPT models through the Responses API.
Cursor
Custom API setup and usage restrictions.
Python and Node.js SDKs
Call Claude through the Anthropic SDK.