GPT-4 Turbo vs Claude 3 Opus: Which AI Model Crafts Better Proposals for Upwork?


In the competitive landscape of freelance platforms like Upwork, utilizing advanced AI tools to craft compelling proposals can significantly elevate a freelancer's success rate. At OmniGPT, we provide seamless access to a suite of large language models (LLMs) including industry leaders like GPT-4 Turbo and Claude 3 Opus. This article delves into their capabilities to determine which model is superior for writing Upwork proposals. For those looking to enhance their proposal-writing skills further, make sure to check out our comprehensive guide on how to write effective Upwork proposals, which offers additional tips and strategies to help you stand out in the freelance market.

Why Use AI for Writing Upwork Proposals?

The task of writing a standout Upwork proposal requires a deep understanding of client needs, the ability to showcase relevant skills effectively, and crafting a message that resonates. Leveraging AI models such as GPT-4 Turbo and Claude 3 Opus can help freelancers generate creative, personalized proposals efficiently, freeing up time to concentrate on delivering quality work.

Exploring GPT-4 Turbo and Claude 3 Opus

Let’s briefly explore the features of these two AI giants:

What is GPT-4 Turbo?

  • Large Language Model Developed by OpenAI
  • Known for its speed and performance in specific tasks
  • Accuracy and expanded vocabulary
  • Creative writing
  • Bigger context window in comparison with other GPTs
  • Currently considered the top chatbot model based on user ratings on Chatbot Arena

What is Claude 3 Opus?

  • Developed by Anthropic
  • Human fluency and understanding
  • Good for complex tasks with higher reasoning and coherence
  • Handles code effectively
  • Multi-lingual capabilities

Here's how they stack up in some key areas:

  • Context window: Claude 3 Opus boasts a larger context window, allowing it to consider more information when generating responses.
  • Speed: While benchmarks aren't entirely settled, GPT-4 Turbo might have a slight edge in processing speed.

Testing GPT-4 vs Claude 3 Opus on OmniGPT

To objectively evaluate which model better handles Upwork proposal tasks, we conducted tests using three different job descriptions on Upwork:

GPT-4 Turbo vs Claude 3 Opus's short job description comparison

Let's choose this job post on Upwork for testing:

Let's test GPT-4 Turbo and Claude 3 Opus a writing proposal for this job on Upwork
Prompt: "Write a professional Upwork proposal for this job: [job title] + [job description]"

GPT-4' Turbo's result ↵

Certainly! Below is a professional proposal tailored for the job title "Looking for an expert in AI/ML development" as per the given job description:

Subject: Experienced AI/ML Developer Ready to Elevate Your Project

Dear [Client's Name],

I hope this message finds you well. After reading through your project details, I am excited about the opportunity to collaborate with you on your AI/ML and prompt engineering project. With a strong background in artificial intelligence and machine learning, coupled with specific expertise in prompt engineering, I am confident in my ability to contribute effectively to your project's success.

About Me: My name is [Your Name], and I am an experienced AI/ML developer with over [X years] of hands-on experience in designing, developing, and deploying intelligent systems across a variety of domains. My expertise spans across deep learning, natural language processing (NLP), computer vision, and predictive modeling, enabling me to tackle complex challenges and deliver solutions that are not only efficient but also scalable and robust.

How I Can Help:

  • AI/ML Development: Leveraging state-of-the-art algorithms and models to create systems that can learn from data, make predictions, and automate decision-making processes.
  • Prompt Engineering: Crafting effective prompts to interact with AI models, ensuring that the outputs are aligned with your project objectives.
  • Custom AI Solutions: Designing and implementing tailored AI solutions that meet your specific requirements, whether it’s enhancing user experience, improving operational efficiency, or driving innovation.
  • Project Collaboration: Working closely with your team to understand your project needs, offering insights into potential AI/ML strategies, and ensuring that the project is delivered on time and within budget.

Why Me?

  • Proven Track Record: Successfully delivered numerous AI/ML projects, which have resulted in significant improvements in performance and productivity for my clients.
  • Technical Proficiency: Proficient in a range of AI/ML technologies and programming languages, including Python, TensorFlow, PyTorch, and others.
  • Problem-Solving Skills: Strong analytical and problem-solving skills, enabling me to tackle complex challenges and deliver innovative solutions.
  • Communication: Excellent communication skills, ensuring clear and consistent updates throughout the project lifecycle.

I am eager to learn more about your project and discuss how we can work together to achieve your goals. I am available for a call or video meeting at your convenience to further discuss your project's specifics and how I can bring value to your team.

Thank you for considering my proposal. I look forward to the possibility of working together.

Best regards,

[Your Name]
[Your Contact Information]
[Your Upwork Profile Link]

Remember to customize the template with your personal details, specific experiences, and any other information that could increase your chances of winning the project.

Claude 3 Opus's result ↵

Here is a draft proposal for the Upwork job:

Dear [Client Name],

I am very interested in your job posting for an AI/ML development expert. With over 5 years of professional experience in artificial intelligence, machine learning, and natural language processing, I believe I would be an excellent fit for your project.

My relevant skills and qualifications include:

  • Expertise in AI/ML frameworks such as TensorFlow, PyTorch, scikit-learn, NLTK, spaCy
  • Extensive experience with prompt engineering techniques to optimize AI language models for specific applications
  • Strong background in mathematics, statistics, and algorithms that are the foundation of AI/ML
  • Proficiency in Python, R, SQL and other programming languages used in AI development
  • Experience deploying and integrating AI models into production applications
  • Excellent problem-solving, communication and collaboration skills

Some of my notable AI/ML projects include:

  • Developed a custom NLP model to automatically categorize and route customer support tickets, increasing efficiency by 45%
  • Built a machine learning pipeline to predict customer churn risk, enabling proactive retention efforts
  • Created a chatbot using prompt engineering to provide personalized product recommendations, lifting conversion rates by 25%

I would welcome the opportunity to learn more about your specific project requirements and goals. I am confident my AI/ML expertise can help drive the project to successful completion.

Please feel free to suggest times for an initial discussion. I am available to connect via phone, video conference or chat at your convenience.

Thank you for your consideration. I look forward to the potential of working together.

Best regards,

[Your Name]

How's that? I focused the proposal on highlighting relevant AI/ML skills, experience and projects to position you as an expert who can deliver results. The call-to-action invites further discussion to learn more details. Feel free to modify as needed for your specific background and the job context. Let me know if you would like me to revise anything.

GPT-4 Turbo vs Claude 3 Opus's detailed job description comparison

We choose this job post for this test. It's a very detailed job description.

The full job description ↵

Job title: AI Image Generation - Construction Products

Job description:
Design Brief for AI-Generated Imagery

Project Overview ---
We are developing a Shopify website for our client who specializes in selling final drive motors for excavators. Our client's business primarily serves the construction industry including small-scale projects and construction companies involved in road work, new home construction, site preparation, plumbing, and pool construction.

Objective ---
Our goal is to generate high-quality, realistic images that showcase excavators and track loaders in various construction settings. These images will be used across the website to enhance the visual appeal and to help potential customers envision the products in real-world applications.

Inspiration and Reference Images ---

Please review the following links to understand the desired quality and style of imagery:

Unsplash - Excavator on Rocky Ground (
ERSWF - Excavator Construction Vehicle Products (
iStock - Search for Bulldozer (
iStock - Search by Image for Excavator (

Targeted Locations for Imagery (EXAMPLES, but we are open to other ideas as well) ---

- Farms and wooded areas
- Road construction sites
- Residential construction sites, including new home foundations and pool construction sites
- Municipal construction projects
- Must-Have Equipment in the Images:

Bobcat Models ---

E20 (, E32 (, E35 (, E50 (, E60 (, E80 (, and T190 track loader (
Kubota Models: SVL75 ( and SVL95-3 (
New Holland Track Loader: LT190B (

Note: It's essential that the equipment appears in use and may have dirt on them to add realism.

Optional Equipment Models ---

John Deere: 35D (, 35G (, 50D (
Caterpillar: 308E2CR (, 303 series (, 259D track loader (, any excavator model 336 (
Takeuchi: TB135 (, or any model starting with "TB" (

Deliverables ---
A series of high-resolution AI-generated images featuring the specified equipment in the outlined settings. Images should be realistic with a focus on showcasing the equipment actively used in construction settings. The final images should be suitable for web use,

GPT-4 Turbo's result ↵

Subject: Proposal for AI Image Generation - Construction Products Project

Dear [Client's Name],

I hope this message finds you well. I am reaching out to express my interest in your project for generating AI-based imagery for your Shopify website dedicated to selling final drive motors for excavators. With a profound expertise in AI image generation and a strong background in creating visual content for the construction industry, I believe I am well-equipped to deliver the high-quality, realistic images that you envision for showcasing excavators and track loaders in various construction settings.

Project Understanding: Your objective is to enhance the visual appeal of your Shopify site and assist potential customers in visualizing your products in real-world applications. This entails creating a series of high-resolution, AI-generated images that feature specific models of excavators and track loaders actively used in diverse construction environments such as farms, road construction sites, residential areas for new home foundations and pool constructions, and municipal construction projects.

Approach and Strategy:

  1. Research and Planning: I will start by thoroughly reviewing the inspiration and reference images you've provided to fully understand the desired quality and style. This will include studying the specific equipment models listed to ensure accuracy in the imagery.
  2. AI Model Training: Utilizing advanced AI image generation technologies, I will train custom models (or adapt existing ones) to generate images that meet your requirements for realism, setting, and equipment usage.
  3. Iterative Design: I will produce initial image drafts for your review, ensuring that they align with your vision. Feedback will be crucial here, as it will guide the refinement process.
  4. Finalization and Delivery: Upon approval of the drafts, I will proceed to generate the full series of images, making sure they are optimized for web use while maintaining high resolution.

Why Choose Me?

  • Experience: Proficient in AI technologies with a focus on image generation, especially within the construction industry context.
  • Quality and Realism: Demonstrated ability to produce images that are not only visually appealing but also realistic and reflective of the equipment in action.
  • Collaborative Workflow: Strong commitment to understanding client needs and incorporating feedback to meet project objectives.
  • Timely Delivery: Proven track record of completing projects on schedule, ensuring that all deliverables meet the agreed-upon timelines.


  • A series of high-resolution, AI-generated images as specified.
  • Revisions based on feedback.
  • Final images optimized for web use.

I am eager to discuss how we can collaborate to achieve the visual impact you desire for your website. I am available for a call or meeting to further understand your needs and outline how my skills and experiences align with your project goals.

Thank you for considering my proposal. I look forward to the opportunity to contribute to your project's success.

Best regards,

[Your Name]
[Your Contact Information]
[Your Upwork Profile Link]

Remember to personalize the proposal with your details, and adjust the technical approach based on your specific skills and tools you plan to use.

Claude 3 Opus's result ↵

Dear [Client Name],

I'm excited to submit a proposal for your AI image generation project showcasing construction equipment. With over 7 years of experience in AI and computer vision, I'm confident I can deliver high-quality, realistic images that meet your needs.

To start, I carefully reviewed your design brief, reference links, and list of target equipment models. This gives me a clear sense of the desired image style, quality, and construction settings you want to highlight.

My approach will leverage state-of-the-art generative AI to produce images that are crisp, detailed, and true-to-life. I will fine-tune the model on construction-specific image datasets to ensure the outputs reflect real-world excavators, bobcats, and other heavy machinery on jobsites. A key advantage is the flexibility to generate countless scene variations without costly photo shoots.

Some examples of my recent AI image generation projects:

  • Product concept images for Caterpillar's new line of automated excavators
  • Marketing assets for Kubota's emerging markets expansion campaign
  • Equipment visuals for John Deere dealer marketing materials

To ensure the images meet your web and branding needs, I will provide:

  • At least 20 unique AI-generated images in high-res JPEG/PNG formats
  • Raw image files for any additional post-processing
  • Copyright releases for web usage
  • Options for further iteration and refinement

Please let me know if you would like any modifications to this proposal. I can schedule a call to discuss your vision for this project in more detail and get started right away. The quick turnaround, flexibility, and cost-efficiency of AI image generation can set your brand apart.

I look forward to potentially working together!

Best, [Your name]

GPT-4 Turbo vs Claude 3 Opus's comparison and rating in writing Upwork's proposals

Here is our rating and comparison of the proposals from GPT-4 Turbo and Claude 3 Opus based on key criteria:

Relevance to Brief

  • GPT-4 Turbo: 5/5 - Thoroughly addresses and tailors to key details in the client's design brief. Clearly articulates an understanding of project goals, target imagery, and equipment models.
  • Claude 3 Opus: 4/5 - Generally aligns with brief details, but lacks some specificity in the project overview around construction settings and equipment models.

Technical Approach

  • GPT-4 Turbo: 5/5 - Provides clear technical strategy leveraging AI image generation with custom model training and iterative refinement process.
  • Claude 3 Opus: 4/5 - Discusses using state-of-the-art AI for image generation, but light on specifics of technical approach.

Quality of Writing

  • GPT-4 Turbo: 5/5 - Professional, polished language and formatting. Personalized with freelancer details. Easy to read flow and structure.
  • Claude 3 Opus: 4/5 - Clear writing and logical structure, but lacks some personalization and could be more persuasive in places.


  • GPT-4-Turbo: 5/5 - Outlines actionable process, includes meeting offer and clear next steps.
  • Claude 3 Opus: 4/5 - Provides call to action to discuss further, but could be stronger in closing the deal.

Attention to Deliverables

  • GPT-4 Turbo: 5/5 - Directly addresses expected image series deliverables optimized for web use.
  • Claude 3 Opus: 4/5 - Calls out specific delivery formats but does not reiterate series or web optimization.

Overall Evaluation

  • GPT-4 Turbo provides a highly detailed, structured, and professional proposal that is both persuasive and relevant, with ample opportunity for customization.
  • Claude 3 Opus delivers a clear, professional, and relevant proposal but could enhance its structure and persuasive elements to provide a more compelling case.

Final Thoughts

OmniGPT is dedicated to equipping freelancers with cutting-edge AI tools like GPT-4 and Claude 3 Opus to excel on platforms such as Upwork. Whether you prioritize analytical depth or engaging narratives, our platform supports your freelance aspirations. Discover the transformative potential of these LLMs and other ChatGPT alternatives at OmniGPT, and redefine your approach to proposal writing in the digital age.