This guide provides instructions for integrating Claude Code with the Truefoundry AI Gateway.

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What is Claude Code?

Claude Code is Anthropic’s agentic coding tool that lives in your terminal, understands your codebase, and helps you code faster through natural language commands. It serves as an intelligent pair programming partner that can read, analyze, and work with your entire project structure.

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Model Configuration

Claude Code supports model aliases (opus, sonnet, haiku, opusplan) that provide convenient shortcuts for different use cases. When integrating with TrueFoundry, you can configure these aliases to use your specific TrueFoundry models through environment variables.
Model aliases allow you to switch between different Claude models during your coding session using simple commands like /model opus or /model sonnet.

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Prerequisites

Before integrating Claude Code with TrueFoundry, ensure you have:
  1. TrueFoundry Account: Create a Truefoundry account with atleast one model provider and generate a Personal Access Token by following the instructions in Generating Tokens
  2. Claude Code Installation: Install Claude Code following the official documentation
  3. Configure models in Truefoundry for each provider you want to use

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Integrate Truefoundry with Claude Code

Claude Code uses a settings.json file for configuration. You’ll need to modify the environment variables to route requests through Truefoundry. First, get the base URL and model name from your TrueFoundry AI Gateway playground using the unified code snippet (ensure you use the same model name as written):
TrueFoundry playground showing unified code snippet with base URL and model name highlighted for Claude Code integration

Get Base URL and Model Name from Unified Code Snippet

Claude Code can be configured either globally or per project by editing the settings file:
  • Global: ~/.claude/settings.json
  • Project-specific: .claude/settings.json in your project directory
{
  "env": {
    "ANTHROPIC_BASE_URL": "https://{controlPlaneUrl}/api/llm/proxy",
    "ANTHROPIC_API_KEY": "dummy", 
    "ANTHROPIC_CUSTOM_HEADERS": "Authorization: Bearer your-truefoundry-api-key\nX-TFY-LOGGING-CONFIG: {\"enabled\": true}",
    "ANTHROPIC_MODEL": "anthropic/claude-4-sonnet-20250514",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "anthropic/claude-4-opus-20250514",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "anthropic/claude-4-sonnet-20250514",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "anthropic/claude-3-5-haiku-20241022"
  }
}
Replace:
  • your-truefoundry-api-key with your TrueFoundry API key
  • controlPlaneUrl with your Control Plane URL
  • projectId with your Google Project Id
  • region with Region of the Model
  • Update the model name to match your configured TrueFoundry models

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Model Alias Configuration

The following environment variables map Claude Code’s built-in aliases to your TrueFoundry models:
  • ANTHROPIC_DEFAULT_OPUS_MODEL: Maps opus alias to your TrueFoundry Opus model
  • ANTHROPIC_DEFAULT_SONNET_MODEL: Maps sonnet alias to your TrueFoundry Sonnet model
  • ANTHROPIC_DEFAULT_HAIKU_MODEL: Maps haiku alias to your TrueFoundry Haiku model
Benefits: Model aliases enable seamless integration with Claude Code’s built-in commands, flexible model switching with /model opus or /model sonnet, and optimized workflows by choosing the right model for each task.

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Example Usage

# Use different models for different tasks
claude --model opus "Design a scalable microservices architecture"
claude --model sonnet "Implement a user authentication system"
claude --model haiku "Write a function to validate email addresses"

# Switch models during a session
/model opusplan  # Uses opus for planning, sonnet for execution