Chat Completion (OpenAI-compatible)

1. Overview

Claude is Anthropic's large language model family, known for strong conversational, writing, coding, and reasoning capabilities. It handles long-context tasks well and is designed with a strong emphasis on safety.

2. Request

• Method:POST

• Endpoint:

  https://gateway.serevixai.ai/v1/chat/completions
  

---

3. Parameters

3.1 Header Parameters

Parameter	Type	Required	Description	Example
Content-Type	string	Yes	Sets the request content type. It must be application/json	application/json
Accept	string	Yes	Sets the response content type. The recommended value is application/json	application/json
Authorization	string	Yes	API key required for authentication, in the format Bearer $YOUR_API_KEY.	Bearer $YOUR_API_KEY

---

3.2 Body Parameters (application/json)

Parameter	Type	Required	Description	Example
model	string	Yes	The model ID to use. See Model List for available versions, such as claude-haiku-4-5-20251001.	claude-haiku-4-5-20251001
messages	array	Yes	A chat message list in an OpenAI-compatible format. Each object contains role and content.	[{"role": "user","content": "Hello"}]
role	string	No	Message role. Supported values: system, user, and assistant.	user
content	string	No	The message content.	Hello, tell me a joke.
temperature	number	No	Sampling temperature in the range 0-2. Higher values make the output more random, while lower values make it more focused and deterministic.	0.7
top_p	number	No	Another way to control the sampling distribution, in the range 0-1. It is usually used instead of temperature.	0.9
stream	boolean	No	Whether to enable streaming output. When set to true, the API returns ChatGPT-style streamed data.	false
max_tokens	number	No	The maximum number of tokens that can be generated in a single reply, subject to the model context window.	8192
reasoning_effort	string	No	Controls how much reasoning effort the model uses for reasoning-heavy tasks. Supported values: low, medium, high, and none. The default is none.	none

---

4. Request Examples

4.1 Chat

HTTPShellGoPython

POST /v1/chat/completions
Content-Type: application/json
Accept: application/json
Authorization: Bearer $YOUR_API_KEY

{
    "model": "claude-haiku-4-5-20251001",
    "messages": [
        {
            "role": "user",
            "content": "Hello, can you explain quantum mechanics to me?"
        }
    ]
}

curl https://gateway.serevixai.ai/v1/chat/completions \
    -H "Content-Type: application/json" \
    -H "Accept: application/json" \
    -H "Authorization: Bearer $YOUR_API_KEY" \
    -d "{
    \"model\": \"claude-haiku-4-5-20251001\",
    \"messages\": [{
        \"role\": \"user\",
        \"content\": \"Hello, can you explain quantum mechanics to me?\"
    }]
}"

package main

import (
    "context"
    "fmt"

    "github.com/openai/openai-go"
    "github.com/openai/openai-go/option"
)

func main() {
    apiKey := "sk-123456789012345678901234567890123456789012345678"

    client := openai.NewClient(
        option.WithAPIKey(apiKey),
        option.WithBaseURL("https://gateway.serevixai.ai/v1"),
    )

    resp, err := client.Chat.Completions.New(
        context.Background(),
        openai.ChatCompletionNewParams{
            Model: "claude-haiku-4-5-20251001",
            Messages: []openai.ChatCompletionMessageParamUnion{
                openai.UserMessage("Hello, can you explain quantum mechanics to me?"),
            },
        },
    )

    if err != nil {
        fmt.Println("error:", err)
        return
    }

    fmt.Println(resp.Choices[0].Message.Content)
}

#!/usr/bin/env python3

from openai import OpenAI

def main():
    api_key = "sk-123456789012345678901234567890123456789012345678"

    client = OpenAI(
        api_key=api_key,
        base_url="https://gateway.serevixai.ai/v1"
    )

    response = client.chat.completions.create(
        model="claude-haiku-4-5-20251001",
        messages=[
            {"role": "user", "content": "Hello, can you explain quantum mechanics to me?"}
        ]
    )

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

if __name__ == "__main__":
    main()

4.2 Image Understanding

The multimodal Image Understanding capability lets you submit an image to the model by upload or image URL.

Supported Image Types

`image/png` `image/jpeg` `image/webp` `image/gif`

HTTPShellGoPython

POST /v1/chat/completions
Content-Type: application/json
Accept: application/json
Authorization: Bearer $YOUR_API_KEY

{
    "model": "claude-haiku-4-5-20251001",
    "messages": [
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "What is in this image?"
                },
                {
                    "type": "image_url",
                    "image_url": {
                        "url": "data:image/jpeg;base64,${base64_image}"
                    }
                }
            ]
        }
    ]
}

base64_image=$(base64 -i "Path/to/agi/image.jpeg");
curl https://gateway.serevixai.ai/v1/chat/completions \
    -H "Content-Type: application/json" \
    -H "Accept: application/json" \
    -H "Authorization: Bearer $YOUR_API_KEY" \
    -d "{
    \"model\": \"claude-haiku-4-5-20251001\",
    \"messages\": [{
        \"role\": \"user\",
        \"content\": [{
                \"type\": \"text\",
                \"text\": \"What is in this image?\"
            },
            {
                \"type\": \"image_url\",
                \"image_url\": {
                    \"url\": \"data:image/jpeg;base64,${base64_image}\"
                }
            }
        ]
    }]
}"

package main

import (
    "context"
    "encoding/base64"
    "fmt"
    "os"

    "github.com/openai/openai-go"
    "github.com/openai/openai-go/option"
)

func main() {
    apiKey := "sk-123456789012345678901234567890123456789012345678"

    client := openai.NewClient(
        option.WithAPIKey(apiKey),
        option.WithBaseURL("https://gateway.serevixai.ai/v1"),
    )

    imagePath := "Path/to/agi/image.jpeg"
    imageBytes, err := os.ReadFile(imagePath)
    if err != nil {
        fmt.Println("error:", err)
        return
    }

    base64Image := base64.StdEncoding.EncodeToString(imageBytes)
    imageURL := "data:image/jpeg;base64," + base64Image

    resp, err := client.Chat.Completions.New(
        context.Background(),
        openai.ChatCompletionNewParams{
            Model: "claude-haiku-4-5-20251001",
            Messages: []openai.ChatCompletionMessageParamUnion{
                openai.UserMessage([]openai.ChatCompletionContentPartUnionParam{
                    openai.TextContentPart("What is in this image?"),
                    openai.ImageContentPart(openai.ChatCompletionContentPartImageImageURLParam{
                        URL: imageURL,
                    }),
                }),
            },
        },
    )

    if err != nil {
        fmt.Println("error:", err)
        return
    }

    fmt.Println(resp.Choices[0].Message.Content)
}

#!/usr/bin/env python3

import base64
from openai import OpenAI

def main():
    api_key = "sk-123456789012345678901234567890123456789012345678"

    client = OpenAI(
        api_key=api_key,
        base_url="https://gateway.serevixai.ai/v1"
    )

    image_path = "Path/to/agi/image.jpeg"
    with open(image_path, "rb") as f:
        image_bytes = f.read()

    base64_image = base64.b64encode(image_bytes).decode("utf-8")
    image_url = f"data:image/jpeg;base64,{base64_image}"

    response = client.chat.completions.create(
        model="claude-haiku-4-5-20251001",
        messages=[{
            "role": "user",
            "content": [
                {"type": "text", "text": "What is in this image?"},
                {"type": "image_url", "image_url": {"url": image_url}}
            ]
        }]
    )

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

if __name__ == "__main__":
    main()

4.3 Function Calling

HTTPShellGoPython

POST /v1/chat/completions
Content-Type: application/json
Accept: application/json
Authorization: Bearer $YOUR_API_KEY

{
    "model": "claude-haiku-4-5-20251001",
    "messages": [{
        "role": "user",
        "content": "What's the weather like in Boston today?"
    }],
    "tools": [{
        "type": "function",
        "function": {
            "name": "get_current_weather",
            "description": "Get the current weather in a given location",
            "parameters": {
                "type": "object",
                "properties": {
                    "location": {
                        "type": "string",
                        "description": "The city and state, e.g. San Francisco, CA"
                    },
                    "unit": {
                        "type": "string",
                        "enum": ["celsius", "fahrenheit"]
                    }
                },
                "required": ["location"]
            }
        }
    }],
    "tool_choice": "auto"
}

curl https://gateway.serevixai.ai/v1/chat/completions \
    -H "Content-Type: application/json" \
    -H "Accept: application/json" \
    -H "Authorization: Bearer $YOUR_API_KEY" \
    -d "{
    \"model\": \"claude-haiku-4-5-20251001\",
    \"messages\": [{
        \"role\": \"user\",
        \"content\": \"What's the weather like in Boston today?\"
    }],
    \"tools\": [{
        \"type\": \"function\",
        \"function\": {
            \"name\": \"get_current_weather\",
            \"description\": \"Get the current weather in a given location\",
            \"parameters\": {
                \"type\": \"object\",
                \"properties\": {
                    \"location\": {
                        \"type\": \"string\",
                        \"description\": \"The city and state, e.g. San Francisco, CA\"
                    },
                    \"unit\": {
                        \"type\": \"string\",
                        \"enum\": [\"celsius\", \"fahrenheit\"]
                    }
                },
                \"required\": [\"location\"]
            }
        }
    }],
    \"tool_choice\": \"auto\"
}"

package main

import (
    "context"
    "encoding/json"
    "fmt"

    "github.com/openai/openai-go"
    "github.com/openai/openai-go/option"
    "github.com/openai/openai-go/packages/param"
    "github.com/openai/openai-go/shared"
)

func main() {
    apiKey := "sk-123456789012345678901234567890123456789012345678"

    client := openai.NewClient(
        option.WithAPIKey(apiKey),
        option.WithBaseURL("https://gateway.serevixai.ai/v1"),
    )

    tools := []openai.ChatCompletionToolParam{
        {
            Type: "function",
            Function: shared.FunctionDefinitionParam{
                Name:        "get_current_weather",
                Description: param.NewOpt("Get the current weather in a given location"),
                Parameters: shared.FunctionParameters{
                    "type": "object",
                    "properties": map[string]interface{}{
                        "location": map[string]interface{}{
                            "type":        "string",
                            "description": "The city and state, e.g. San Francisco, CA",
                        },
                        "unit": map[string]interface{}{
                            "type": "string",
                            "enum": []string{"celsius", "fahrenheit"},
                        },
                    },
                    "required": []string{"location"},
                },
            },
        },
    }

    resp, err := client.Chat.Completions.New(
        context.Background(),
        openai.ChatCompletionNewParams{
            Model: "claude-haiku-4-5-20251001",
            Messages: []openai.ChatCompletionMessageParamUnion{
                openai.UserMessage("What's the weather like in Boston today?"),
            },
            Tools: tools,
            ToolChoice: openai.ChatCompletionToolChoiceOptionUnionParam{
                OfAuto: param.NewOpt("auto"),
            },
        },
    )

    if err != nil {
        fmt.Println("error:", err)
        return
    }

    msg := resp.Choices[0].Message

    if msg.ToolCalls != nil && len(msg.ToolCalls) > 0 {
        for _, call := range msg.ToolCalls {
            fmt.Println("🔧 Function called:", call.Function.Name)
            fmt.Println("📥 Arguments JSON:", call.Function.Arguments)

            // If you want to parse the arguments
            var args map[string]any
            _ = json.Unmarshal([]byte(call.Function.Arguments), &args)
            fmt.Println("📦 Parsed args:", args)
        }
    } else {
        fmt.Println("💬 Assistant reply:", msg.Content)
    }
}

#!/usr/bin/env python3

import json
from openai import OpenAI

def main():
    api_key = "sk-123456789012345678901234567890123456789012345678"

    client = OpenAI(
        api_key=api_key,
        base_url="https://gateway.serevixai.ai/v1"
    )

    tools = [{
        "type": "function",
        "function": {
            "name": "get_current_weather",
            "description": "Get the current weather in a given location",
            "parameters": {
                "type": "object",
                "properties": {
                    "location": {
                        "type": "string",
                        "description": "The city and state, e.g. San Francisco, CA"
                    },
                    "unit": {
                        "type": "string",
                        "enum": ["celsius", "fahrenheit"]
                    }
                },
                "required": ["location"]
            }
        }
    }]

    response = client.chat.completions.create(
        model="claude-haiku-4-5-20251001",
        messages=[
            {"role": "user", "content": "What's the weather like in Boston today?"}
        ],
        tools=tools,
        tool_choice="auto"
    )

    msg = response.choices[0].message

    if msg.tool_calls:
        for call in msg.tool_calls:
            print(f"🔧 Function called: {call.function.name}")
            print(f"📥 Arguments JSON: {call.function.arguments}")

            args = json.loads(call.function.arguments)
            print(f"📦 Parsed args: {args}")
    else:
        print(f"💬 Assistant reply: {msg.content}")

if __name__ == "__main__":
    main()

5. Response Example

{
    "id": "chatcmpl-1234567890",
    "object": "chat.completion",
    "created": 1699999999,
    "model": "claude-haiku-4-5-20251001",
    "choices": [
        {
            "message": {
                "role": "assistant",
                "content": "Quantum mechanics is the branch of physics that studies the microscopic world..."
            },
            "finish_reason": "stop"
        }
    ],
    "usage": {
        "prompt_tokens": 10,
        "completion_tokens": 30,
        "total_tokens": 40
    }
}