OLMo 2 vs. Claude 3.5 Sonnet: Which is Better?

The AI industry is divided between two powerful philosophies – Open-source democratization and proprietary innovation. OLMo 2(Open Language Model 2), developed by AllenAI, represents the pinnacle of transparent AI development with full public access to its architecture and training data. In contrast, Claude 3.5 Sonnet, Anthropic’s flagship model, prioritizes commercial-grade coding capabilities and multimodal reasoning behind closed doors.

This article dives into their technical architectures, use cases, and practical workflows, complete with code examples and dataset references. Whether you’re building a startup chatbot or scaling enterprise solutions, this guide will help you make an informed choice.

Learning Objectives

In this article, you will:

• Understand how design choices (e.g., RMSNorm, rotary embeddings) influence training stability and performance in OLMo 2 and Claude 3.5 Sonnet.
• Learn about token-based API costs (Claude 3.5) versus self-hosting overhead (OLMo 2).
• Implement both models in practical coding scenarios through concrete examples.
• Compare performance metrics for accuracy, speed, and multilingual tasks.
• Understand the fundamental architectural differences between OLMo 2 and Claude 3.5 Sonnet.
• Evaluate cost-performance trade-offs for different project requirements.

This article was published as a part of the Data Science Blogathon.

OLMo 2: A Fully Open Autoregressive Model

OLMo 2 is an entirely open-source autoregressive language model, trained on an enormous dataset comprising 5 trillion tokens. It is released with full disclosure of its weights, training data, and source code empowering researchers and developers to reproduce results, experiment with the training process, and build upon its innovative architecture.

What are the key Architectural Innovations of OLMo 2?

OLMo 2 incorporates several key architectural modifications designed to enhance both performance and training stability.

• RMSNorm: OLMo 2 utilizes Root Mean Square Normalization (RMSNorm) to stabilize and accelerate the training process. RMSNorm, as discussed in various deep learning studies, normalizes activations without the need for bias parameters, ensuring consistent gradient flows even in very deep architectures.
• Rotary Positional Embeddings: To encode the order of tokens effectively, the model integrates rotary positional embeddings. This method, which rotates the embedding vectors in a continuous space, preserves the relative positions of tokens—a technique further detailed in research such as the RoFormer paper.
• Z-loss Regularization: In addition to standard loss functions, OLMo 2 applies Z-loss regularization. This extra layer of regularization helps in controlling the scale of activations and prevents overfitting, thereby enhancing generalization across diverse tasks.

Try OLMo 2 model live – here

Training and Post-Training Enhancements

• Two-Stage Curriculum Training: The model is initially trained on the Dolmino Mix-1124 dataset, a large and diverse corpus designed to cover a wide range of linguistic patterns and downstream tasks. This is followed by a second phase where the training focuses on task-specific fine-tuning.

• Instruction Tuning via RLVR: Post-training, OLMo 2 undergoes instruction tuning using Reinforcement Learning with Verifiable Rewards (RLVR). This process refines the model’s reasoning abilities, aligning its outputs with human-verified benchmarks. The approach is similar in spirit to techniques like RLHF (Reinforcement Learning from Human Feedback) but places additional emphasis on reward verification for increased reliability.

These architectural and training strategies combine to create a model that is not only high-performing but also robust and adaptable which is a true asset for academic research and practical applications alike.

Claude 3.5 Sonnet: A Closed‑Source Model for Ethical and Coding‑Focused Applications

In contrast to the open philosophy of OLMo 2, Claude 3.5 Sonnet is a closed‑source model optimized for specialized tasks, particularly in coding and ensuring ethically sound outputs. Its design reflects a careful balance between performance and responsible deployment.

Core Features and Innovations

• Multimodal Processing: Claude 3.5 Sonnet is engineered to handle both text and image inputs seamlessly. This multimodal capability allows the model to excel in generating, debugging, and refining code, as well as interpreting visual data, a feature that is supported by contemporary neural architectures and is increasingly featured in research on integrated AI systems.
• Computer Interface Interaction: One of the standout features of Claude 3.5 Sonnet is its experimental API integration that enables the model to interact directly with computer interfaces. This functionality, which includes simulating actions like clicking buttons or typing text, bridges the gap between language understanding and direct control of digital environments. Recent technological news and academic discussions on human-computer interaction highlight the significance of such advancements.
• Ethical Safeguards: Recognizing the potential risks of deploying advanced AI models, Claude 3.5 Sonnet has been subjected to rigorous fairness testing and safety protocols. These measures ensure that the outputs remain aligned with ethical standards, minimizing the risk of harmful or biased responses. The development and implementation of these safeguards are in line with emerging best practices in the AI community, as evidenced by research on ethical AI frameworks.

By focusing on coding applications and ensuring ethical reliability, Claude 3.5 Sonnet addresses niche requirements in industries that demand both technical precision and moral accountability.

Try Claude 3.5 Sonnet model live- here.

Technical Comparison of OLMo 2 vs. Claude 3.5 Sonnet

Pricing Comparison of OLMo 2 vs. Claude 3.5 Sonnet

OLMo 2 is approximately four times more cost-effective for output-heavy tasks, making it ideal for budget-conscious projects. Note that since OLMo 2 is an open‑source model, there is no fixed per‑token licensing fee, its cost depends on your self‑hosting compute resources. In contrast, Anthropic’s API rates set Claude 3.5 Sonnet’s pricing.

Accessing the Olmo 2 Model and Claude 3.5 Sonnet API

How to run the Ollama (Olmo 2) model locally?

Visit the official Ollama repository or website to download the installer – here.

Once you have Ollama, install the necessary Python package

pip install ollama

Download the Olmo 2 Model. This command fetches the Olmo 2 model (7-billion-parameter version)

ollama run olmo2:7b

Create a Python file and execute the following sample code to interact with the model and retrieve its responses.

import ollama

def generate_with_olmo(prompt, n_predict=1000):
    """
    Generate text using Ollama's Olmo 2 model (streaming version),
    controlling the number of tokens with n_predict.
    """
    full_text = []
    try:
        for chunk in ollama.generate(
            model="olmo2:7b",
            prompt=prompt,
            options={"n_predict": n_predict},  
            stream=True                        
        ):
            full_text.append(chunk["response"])
        return "".join(full_text)
    except Exception as e:
        return f"Error with Ollama API: {str(e)}"

if __name__ == "__main__":
    output = generate_with_olmo("Explain the concept of quantum computing in simple terms.")
    print("Olmo 2 Response:", output)

How to access Claude 3.5 Sonnet Api?

Head over to the Anthropic console page. Select Get API keys.

Click on Create Key and name your key. Click on Add.

Note: Don’t forget to save that API key somewhere you won’t be able to see it again.

Install the Anthropic Library

pip install anthropic

Create a Python file and execute the following sample code to interact with the model and retrieve its responses.

import anthropic
from anthropic import Anthropic

# Create an instance of the Anthropic API client
client = Anthropic(api_key='your-api-key') 

def generate_with_claude(prompt, max_tokens=1000):
    """
    Generate text using Claude 3.5 API
    """
    try:
        message = client.messages.create(  
            model="claude-3-5-sonnet-20241022",
            max_tokens=max_tokens,
            messages=[
                {
                    "role": "user",
                    "content": prompt
                }
            ]
        )
        return message.content
    except Exception as e:
        return f"Error with Claude API: {str(e)}"

if __name__ == "__main__":
    output = generate_with_claude("Explain the concept of quantum computing in simple terms.")
    print("Claude 3.5 Sonnet Response:", output)

OLMo 2 vs. Claude 3.5 Sonnet: Comparing Coding Capabilities

Using Olmo2 and Claude 3.5 Sonnet models for the below tasks.

Task 1: Computing the nth Fibonacci Number

Prompt: “Give me code to Compute the nth Fibonacci Number.”

a) OLMo 2 Response

def fibonacci_optimized(n):
    if n 

b) Claude Sonnet 3.5 Response

def fibonacci_recursive(n):
    """
    Compute nth Fibonacci number using recursion.
    Warning: Not efficient for large numbers due to exponential time complexity.
    Time Complexity: O(2^n)
    Space Complexity: O(n) due to recursion stack
    """
    if n 

Insights: 

OLMo 2 provides an iterative approach that is efficient but lacks flexibility, offering only one method. Claude Sonnet 3.5, on the other hand, presents three different implementations: recursive (inefficient but educational), iterative (optimal for general use), and matrix exponentiation (best for large inputs). Claude’s response is significantly more comprehensive, covering multiple use cases and including a test suite to verify correctness.

Task 2: Plotting a Scatter plot

“Prompt: Generate a Python script that uses Matplotlib and Seaborn to produce a vibrant scatter plot showing the relationship between two variables. The plot should include clear axis labels, a descriptive title, and distinct colors to differentiate the data points.“

a) OLMo 2 response:

b) Claude Sonnet 3.5 Response:

You can find the code responses – here.

Insights: 

OLMo 2’s response correctly generates a scatter plot but lacks visual enhancements beyond basic differentiation of groups. Claude Sonnet 3.5 goes further by integrating size variation, a regression trend line, and correlation annotation, resulting in a more informative and visually appealing plot. Claude’s response demonstrates a better grasp of advanced visualization techniques and statistical insights.

Task 3: Code Translation

Prompt: “Convert this Java method into Python code while maintaining equivalent functionality:

public static int addNumbers(int a, int b) {
    return a + b;
}
```”

a) OLMo 2 response:

def add_numbers(a, b):
    return a + b

b) Claude Sonnet 3.5 Response:

def add_numbers(a, b):
    return a + b

Insights: 

Both OLMo 2 and Claude Sonnet 3.5 provide identical solutions, accurately translating the Java method to Python. Since the function is straightforward, there is no room for differentiation, making both responses equally effective.

Task 4: Optimizing Inefficient Code

Prompt: “Optimize the following Python function to reduce time complexity.

def find_duplicates(numbers):
    duplicates = []
    for i in range(len(numbers)):
        for j in range(i+1, len(numbers)):
            if numbers[i] == numbers[j] and numbers[i] not in duplicates:
                duplicates.append(numbers[i])
    return duplicates
```”

a) OLMo 2 response:

def find_duplicates(numbers):
    seen = set()  # Using a set to store seen elements
    duplicates = []  # List to store duplicates

    for num in numbers:
        if num in seen:
            duplicates.append(num)  # If the number is in the set, it's a duplicate
        seen.add(num)  # Add the number to the set

    return duplicates

b) Claude Sonnet 3.5 Response:

def find_duplicates(numbers):
    seen = set()
    duplicates = set() 
    for num in numbers:
        if num in seen:
            duplicates.add(num)
        else:
            seen.add(num) 
    return list(duplicates)

Insights: 

OLMo 2 improves the function by using a set to track seen elements but retains a list for storing duplicates, leading to potential redundancy. Claude Sonnet 3.5 optimizes further by storing duplicates in a set and converting it back to a list at the end, improving efficiency and avoiding unnecessary operations. Claude’s approach is cleaner, ensuring better time complexity while maintaining correctness.

Task 5: Code Debugging

Prompt: “Below is a Python script that calculates the factorial of a number, but it contains bugs. Identify and correct the errors to ensure it returns the correct factorial for any positive integer:

def factorial(n):
    if n == 0:
        return 1
    return n * factorial(n - 2)
```”

a) OLMo 2 response:

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n - 1)

b) Claude Sonnet 3.5 Response:

def factorial(n):
    # Input validation
    if not isinstance(n, int):
        raise TypeError("Input must be an integer")
    if n 

Insights: 

OLMo 2 correctly fixes the factorial function’s recursion step but lacks input validation. Claude Sonnet 3.5 not only corrects the recursion but also includes input validation to handle negative numbers and non-integer inputs, making it more robust. Claude’s solution is more thorough and suitable for real-world applications.

Strategic Decision Framework: OLMo 2 vs. Claude 3.5 Sonnet

When to Choose OLMo 2?

• Budget-Constrained Projects: Free self-hosting vs API fees
• Transparency Requirements: Academic research/auditable systems
• Customization Needs: Full model architecture access and tasks that require domain-specific fine-tuning
• Language Focus: English-dominant applications
• Rapid Prototyping: Local experimentation without API limits

When to Choose Claude 3.5 Sonnet?

• Enterprise-Grade Coding: Complex code generation/refactoring
• Multimodal Requirements: Image and text processing needs on a live server.
• Global Deployments: 50+ language support
• Ethical Compliance: Constitutionally aligned outputs
• Scale Operations: Managed API infrastructure

Conclusion

OLMo 2 democratizes advanced NLP through full transparency and cost efficiency (ideal for academic research and budget-conscious prototyping), Claude 3.5 Sonnet delivers enterprise-grade precision with multimodal coding prowess and ethical safeguards. The choice isn’t binary, forward-thinking organizations will strategically deploy OLMo 2 for transparent, customizable workflows and reserve Claude 3.5 Sonnet for mission-critical coding tasks requiring constitutional alignment. As AI matures, this symbiotic relationship between open-source foundations and commercial polish will define the next era of intelligent systems. I hope you found this OLMo 2 vs. Claude 3.5 Sonnet guide helpful, let me know in the comment section below.

Key Takeaways

• OLMo 2 offers full access to weights and code, while Claude 3.5 Sonnet provides an API-focused, closed-source model with robust enterprise features.
• OLMo 2 is effectively “free” apart from hosting costs, ideal for budget-conscious projects; Claude 3.5 Sonnet uses a pay-per-token model, which is potentially more cost-effective for enterprise-scale usage.
• Claude 3.5 Sonnet excels in code generation and debugging, providing multiple methods and thorough solutions; OLMo 2’s coding output is generally succinct and iterative.
• OLMo 2 supports deeper customization (including domain-specific fine-tuning) and can be self-hosted. Claude 3.5 Sonnet focuses on multimodal inputs, direct computer interface interactions, and strong ethical frameworks.
• Both models can be integrated via Python, but Claude 3.5 Sonnet is particularly user-friendly for enterprise settings, while OLMo 2 encourages local experimentation and advanced research.

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Hello! I’m a passionate AI and Machine Learning enthusiast currently exploring the exciting realms of Deep Learning, MLOps, and Generative AI. I enjoy diving into new projects and uncovering innovative techniques that push the boundaries of technology. I’ll be sharing guides, tutorials, and project insights based on my own experiences, so we can learn and grow together. Join me on this journey as we explore, experiment, and build amazing solutions in the world of AI and beyond!