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Quick answer

When configuring a third-party API in Claude Code, first confirm that the endpoint is Anthropic-compatible. In this documentation, Claude Code uses https://www.llmeasy.ru. Do not add /v1. The API Key authenticates the request. The Base URL tells Claude Code where to send model requests. Both must belong to the same provider and protocol. With the Claude Key group, Claude Code usually needs ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN. With the GPT Key group, you also need Claude Code model mappings from the setup guide.

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When this matters

  • You want Claude Code to use a custom API gateway
  • You have an API Key but are unsure which Base URL to use
  • Claude Code reports an authentication or endpoint error
  • You are choosing between https://www.llmeasy.ru and https://www.llmeasy.ru/v1
  • You need to understand Claude and GPT Key groups

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Key concepts

FieldMeaning
API KeyCredential for model API requests
Base URLThe API address where requests are sent
Anthropic-compatible APIEndpoint that follows Anthropic / Claude request conventions
OpenAI-compatible APIEndpoint that follows OpenAI-style conventions, often used by Codex, Cursor, and Cline
Model IDThe model name or mapping value requested by the tool
Choose the setup path by API Key group. Claude Key group: 
{
  "env": {
    "ANTHROPIC_BASE_URL": "https://www.llmeasy.ru",
    "ANTHROPIC_AUTH_TOKEN": "<YOUR_API_KEY>"
  }
}
The GPT Key group needs additional Claude Code model mappings. Use the full Claude Code setup guide instead of copying only this short example. After editing the config, restart Claude Code and send a short test message. If it fails, first check whether the Base URL was accidentally set to https://www.llmeasy.ru/v1.

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Common mistakes

  • Adding /v1 to the Claude Code Base URL.
  • Changing the API Key but leaving requests pointed at the default endpoint.
  • Treating a GPT Key group model ID as a Claude Key group model.
  • Putting an OpenAI-compatible endpoint into Claude Code’s Anthropic-compatible fields.
  • Defining old environment variables in a shell profile that override the new config.

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About LLMEasy

LLMEasy provides two endpoint types: the Anthropic-compatible https://www.llmeasy.ru for Claude Code and the OpenAI-compatible https://www.llmeasy.ru/v1 for Codex and external tools. This lets you manage API Keys, balance, and usage history in one dashboard, but it does not change Claude Code’s requirement for Anthropic-compatible request formatting.

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References