Comparing Top10 LMSYS Models with Portkey

The LMSYS Chatbot Arena, with over 1,000,000 human comparisons, is the gold standard for evaluating LLM performance. But, testing multiple LLMs is a pain, requiring you to juggle APIs that all work differently, with different authentication and dependencies.

Enter Portkey: A unified, open source API for accessing over 1,600+ LLMs. Portkey makes it a breeze to call the models on the LMSYS leaderboard - no setup required.

In this notebook, you’ll see how Portkey streamlines LLM evaluation for the Top 10 LMSYS Models, giving you valuable insights into cost, performance, and accuracy metrics. Let’s dive in!

Video Guide

The notebook comes with a video guide that you can follow along

Setting up Portkey

To get started, install the necessary packages:

pip install -qU portkey-ai openai

Next, sign up for a Portkey API key at https://app.portkey.ai/. Navigate to “Settings” -> “API Keys” and create an API key with the appropriate scope.

Defining the Top 10 LMSYS Models

Let’s define the list of Top 10 LMSYS models and their corresponding providers.

Python

top_10_models = [
    ["gpt-4o-2024-05-13", "openai"],
    ["gemini-1.5-pro-latest", "google"],
    ["gpt-4-turbo-2024-04-09", "openai"],
    ["gpt-4-1106-preview", "openai"],
    ["claude-3-opus-20240229", "anthropic"],
    ["gpt-4-0125-preview", "openai"],
    ["gemini-1.5-flash-latest", "google"],
    ["gemini-1.0-pro", "google"],
    ["meta-llama/Llama-3-70b-chat-hf", "together"],
    ["claude-3-sonnet-20240229", "anthropic"],
    ["reka-core-20240501", "reka-ai"],
    ["command-r-plus", "cohere"],
    ["gpt-4-0314", "openai"],
    ["glm-4", "zhipu"],
]

Add Providers to Model Catalog

ALL the providers above are integrated with Portkey - add them to Model Catalog to get provider slugs for streamlined API key management.

Provider	Link to get API Key	Payment Mode
openai	https://platform.openai.com/	Wallet Top Up
anthropic	https://console.anthropic.com/	Wallet Top Up
google	https://aistudio.google.com/	Free to Use
cohere	https://dashboard.cohere.com/	Free Credits
together-ai	https://api.together.ai/	Free Credits
reka-ai	https://platform.reka.ai/	Wallet Top Up
zhipu	https://open.bigmodel.cn/	Free to Use

Python

# Replace with your provider slugs from Model Catalog
provider_slugs = {
    "openai": "@openai-prod",
    "anthropic": "@anthropic-prod",
    "google": "@google-prod",
    "cohere": "@cohere-prod",
    "together": "@together-prod",
    "reka-ai": "@reka-prod",
    "zhipu": "@zhipu-prod"
}

Running the Models with Portkey

Now, let’s create a function to run the Top 10 LMSYS models using OpenAI SDK with Portkey Gateway:

OpenAI Python

from openai import OpenAI
from portkey_ai import PORTKEY_GATEWAY_URL, createHeaders

def run_top10_lmsys_models(prompt):
    outputs = {}
    for model, provider in top_10_models:
        client = OpenAI(
            api_key="YOUR_PORTKEY_API_KEY",
            base_url=PORTKEY_GATEWAY_URL,
            default_headers=createHeaders(
                provider=provider_slugs[provider],
                trace_id="COMPARING_LMSYS_MODELS"
            )
        )
        response = client.chat.completions.create(
            messages=[{"role": "user", "content": prompt}],
            model=model,
            max_tokens=256
        )
        outputs[model] = response.choices[0].message.content
    return outputs

Comparing Model Outputs

To display the model outputs in a tabular format for easy comparison, we define the print_model_outputs function:

Python

from tabulate import tabulate

def print_model_outputs(prompt):
    outputs = run_top10_lmsys_models(prompt)
    table_data = []
    for model, output in outputs.items():
        table_data.append([model, output.strip()])
    headers = ["Model", "Output"]
    table = tabulate(table_data, headers, tablefmt="grid")
    print(table)

Example: Evaluating LLMs for a Specific Task

Let’s run the notebook with a specific prompt to showcase the differences in responses from various LLMs: On Portkey, you will be able to see the logs for all models:

Python

prompt = "If 20 shirts take 5 hours to dry, how much time will 100 shirts take to dry?"
print_model_outputs(prompt)

Conclusion

With minimal setup and code modifications, Portkey enables you to streamline your LLM evaluation process and easily call 1600+ LLMs to find the best model for your specific use case. Explore Portkey further and integrate it into your own projects. Visit the Portkey documentation at https://docs.portkey.ai/ for more information on how to leverage Portkey’s capabilities in your workflow.

Last modified on February 4, 2026

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⌘I

Evals

Prompt Engineering

Whitepapers

Getting Started

Integrations

Use Cases

Comparing Top10 LMSYS Models with Portkey

Video Guide

Setting up Portkey

Defining the Top 10 LMSYS Models

Add Providers to Model Catalog

Running the Models with Portkey

Comparing Model Outputs

Example: Evaluating LLMs for a Specific Task

Conclusion

​Video Guide

​Setting up Portkey

​Defining the Top 10 LMSYS Models

​Add Providers to Model Catalog

​Running the Models with Portkey

​Comparing Model Outputs

​Example: Evaluating LLMs for a Specific Task

​Conclusion

Video Guide

Setting up Portkey

Defining the Top 10 LMSYS Models

Add Providers to Model Catalog

Running the Models with Portkey

Comparing Model Outputs

Example: Evaluating LLMs for a Specific Task

Conclusion