A production-ready, non-streaming backend that exposes OpenAI-compatible endpoints for both OpenAI and Anthropic Claude models — including full tool_calls / function calling support.

https://tmp100nuaa--b8479a5a310011f1a25642dde27851f2.web.val.run/api/v1

Add your Anthropic API key as an environment variable in this val:

OpenAI models work out-of-the-box via Val Town's built-in proxy (no key needed).

Returns all available models in OpenAI format. No auth required.

curl https://.../api/v1/models

Non-streaming chat completions with tool_calls support.

Auth: Any Bearer <token> header is accepted.

curl -X POST https://.../api/v1/chat/completions \
  -H "Authorization: Bearer any-token" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o-mini",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

curl -X POST https://.../api/v1/chat/completions \
  -H "Authorization: Bearer any-token" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-3-5-sonnet",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {"role": "user", "content": "What is 2+2?"}
    ]
  }'

curl -X POST https://.../api/v1/chat/completions \
  -H "Authorization: Bearer any-token" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-3-5-sonnet",
    "messages": [{"role": "user", "content": "Whats the weather in Beijing?"}],
    "tools": [{
      "type": "function",
      "function": {
        "name": "get_weather",
        "description": "Get weather for a city",
        "parameters": {
          "type": "object",
          "properties": {
            "city": {"type": "string"},
            "unit": {"type": "string", "enum": ["celsius", "fahrenheit"]}
          },
          "required": ["city"]
        }
      }
    }],
    "tool_choice": "auto"
  }'

curl -X POST https://.../api/v1/chat/completions \
  -H "Authorization: Bearer any-token" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-3-5-sonnet",
    "messages": [
      {"role": "user", "content": "Whats the weather in Beijing?"},
      {"role": "assistant", "content": null, "tool_calls": [{"id": "call_123", "type": "function", "function": {"name": "get_weather", "arguments": "{\"city\":\"Beijing\"}"}}]},
      {"role": "tool", "tool_call_id": "call_123", "content": "{\"temp\": 22, \"condition\": \"Sunny\"}"}
    ]
  }'

from openai import OpenAI

client = OpenAI(
    api_key="any-token",
    base_url="https://tmp100nuaa--b8479a5a310011f1a25642dde27851f2.web.val.run/api/v1"
)

# Simple chat
response = client.chat.completions.create(
    model="claude-3-5-sonnet",
    messages=[{"role": "user", "content": "Hello Claude!"}]
)
print(response.choices[0].message.content)

# With tools
tools = [{
    "type": "function",
    "function": {
        "name": "get_weather",
        "description": "Get current weather",
        "parameters": {
            "type": "object",
            "properties": {"city": {"type": "string"}},
            "required": ["city"]
        }
    }
}]

response = client.chat.completions.create(
    model="claude-3-5-sonnet",
    messages=[{"role": "user", "content": "Weather in Shanghai?"}],
    tools=tools,
    tool_choice="auto"
)
msg = response.choices[0].message
if msg.tool_calls:
    print("Tool called:", msg.tool_calls[0].function.name)
    print("Arguments:", msg.tool_calls[0].function.arguments)

• Streaming is disabled — set stream: false or omit it entirely.
• tool_choice mapping: "auto" → Anthropic auto, "required" → Anthropic any, {"type":"function","function":{"name":"..."}} → Anthropic tool type.
• system messages are correctly lifted to Anthropic's top-level system parameter.
• tool role messages (tool results) are converted to Anthropic's tool_result block format.