Build on every model through one OpenAI-compatible API.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.oneinterface.ai/v1",
    api_key="oi_your_api_key",
)

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Write a one-line haiku about APIs."}],
)

print(response.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.oneinterface.ai/v1",
  apiKey: process.env.ONEINTERFACE_API_KEY,
});

const response = await client.chat.completions.create({
  model: "claude-sonnet-4-6",
  messages: [{ role: "user", content: "Summarize this pull request." }],
});

console.log(response.choices[0].message.content);

curl https://api.oneinterface.ai/v1/chat/completions \
  -H "Authorization: Bearer oi_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [
      { "role": "user", "content": "Hello from One Interface" }
    ]
  }'

Authorization: Bearer oi_your_api_key
Content-Type: application/json

await client.chat.completions.create({
  model: "gpt-4o",
  stream: true,
  messages: [{ role: "user", content: "Think step by step." }],
});

{
  "error": {
    "message": "The requested model is not available.",
    "type": "oneinterface_error",
    "code": "model_not_available"
  }
}

Provider type: OpenAI-compatible
Base URL: https://api.oneinterface.ai/v1
API key: oi_your_api_key
Model: gpt-4o, claude-sonnet-4-6, or any model ID from /v1/models

# Example custom provider shape for tools that support provider config
provider = "oneinterface"
base_url = "https://api.oneinterface.ai/v1"
api_key_env = "ONEINTERFACE_API_KEY"
model = "claude-sonnet-4-6"

# --bare forces Claude Code to use ANTHROPIC_API_KEY instead of its OAuth session.
# Without --bare the OAuth token is sent to One Interface and rejected (401).
ANTHROPIC_API_KEY=oi_your_api_key \
ANTHROPIC_BASE_URL=https://api.oneinterface.ai \
  claude --bare --model gpt-4o-mini

# Recommended: add an alias to ~/.zshrc so you just type "claude-oi"
alias claude-oi='ANTHROPIC_API_KEY=oi_your_api_key ANTHROPIC_BASE_URL=https://api.oneinterface.ai claude --bare --model gpt-4o-mini'

# Run once in your terminal — registers the server for all your projects
claude mcp add --transport http -s user oneinterface https://api.oneinterface.ai/mcp \
  -H "Authorization: Bearer oi_your_api_key"

# Verify the connection
claude mcp list