Using Ling in Claude Code

Claude Code is the official AI coding tool from Anthropic. Ant Ling provides an Anthropic compatible interface, so you can use Ant Ling models in Claude Code with just a few configuration steps.

What You Need

Create API Key
Install Claude Code

Configuration

Claude Code uses environment variables to specify the Anthropic compatible endpoint and API key. You can also map all of Claude Code’s internal Opus / Sonnet / Haiku tiers to the same Ling model to prevent it from falling back to Anthropic’s own model IDs.

Configure the API Endpoint and Key

Environment Variable	Value
ANTHROPIC_BASE_URL	`https://api.ant-ling.com/anthropic`
ANTHROPIC_API_KEY	Your Ling API Key

Configure Model Mapping

The following variables map the default model and each tier to a Ling model ID. The example uses Ling-2.6-flash — change it to Ling-2.6-1T, Ling-2.5-1T, or Ring-1T as needed.

Environment Variable	Example Value
ANTHROPIC_MODEL	`Ling-2.6-flash`
ANTHROPIC_DEFAULT_OPUS_MODEL	`Ling-2.6-flash`
ANTHROPIC_DEFAULT_SONNET_MODEL	`Ling-2.6-flash`
ANTHROPIC_DEFAULT_HAIKU_MODEL	`Ling-2.6-flash`

Managing Config with `.env`

If you prefer to manage configuration per project, create a .env file in your project root. Claude Code automatically reads the .env file in the current directory on startup.


# .env (do not commit to version control)
ANTHROPIC_BASE_URL=https://api.ant-ling.com/anthropic
ANTHROPIC_API_KEY=<YOUR_API_KEY>
ANTHROPIC_MODEL=Ling-2.6-flash
ANTHROPIC_DEFAULT_OPUS_MODEL=Ling-2.6-flash
ANTHROPIC_DEFAULT_SONNET_MODEL=Ling-2.6-flash
ANTHROPIC_DEFAULT_HAIKU_MODEL=Ling-2.6-flash

The .env file contains your API Key. Never commit it to version control. Add .env to your .gitignore.

Quick Start

Temporary (current session)


export ANTHROPIC_BASE_URL=https://api.ant-ling.com/anthropic
export ANTHROPIC_AUTH_TOKEN=<YOUR_API_KEY>

Specify the Ling model using the --model flag, for example:


# Use Ling-2.6-flash (general conversation, fast)
claude --model Ling-2.6-flash
 
# Use Ling-2.6-1T (complex reasoning, code debugging)
claude --model Ling-2.6-1T

Usage Example


# Set environment variables
export ANTHROPIC_BASE_URL="https://api.ant-ling.com/anthropic"
export ANTHROPIC_API_KEY="<YOUR_API_KEY>"
 
# Run a one-off task in non-interactive mode
claude -p "Explain what this Go code does" --model Ling-2.6-flash
 
# Start an interactive session in your current project
cd /your/project
claude --model Ling-2.6-flash

FAQ

`AuthenticationError` / 401 Error

Confirm ANTHROPIC_API_KEY is set to your Ling API Key (not an Anthropic key)
Confirm ANTHROPIC_BASE_URL has no trailing path — the correct value is https://api.ant-ling.com/anthropic
Verify your API Key is valid in the API Console

Model Name Not Recognized

Ling model names are case-sensitive. Make sure you use the exact names: Ling-2.6-1T, Ling-2.6-flash, Ling-2.5-1T, Ring-1T, etc.

How Do I Verify I’m Using the Ling Backend?


claude -p "Which model are you?" --model Ling-2.6-flash

A Ling model will introduce itself as part of Ant Ling’s Ling series, not as Claude.

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