The power of large language models is obvious to everyone - but choosing the right LLM to underpin your products and services requires some careful consideration.

Everyone is getting into generative AI, which has become one of the most rapidly adopted technologies in history and which has the potential to have the most impact long term.  

Our new guide, 2025 Global Software Outsourcing Rates and Trends Guide, features a recent survey of Accelerance’s global partner network and revealed that many partners are developing and deploying generative AI systems, both to streamline and enhance their software development processes, and to build new products and services for their customers.

The big IT services firms are also ramping up to make AI central to their offerings. Indian IT provider Infosys says it has 80 generative AI projects in the works and is upskilling 40,000 employees to work with generative AI. In the first four months of the year alone, Accenture secured over $100 million of deals to help customers deploy generative AI systems.

Modern Companies Have Many Open Source Large Language Models to Choose From

At the heart of AI services are large language models, which researchers have been developing for years. However, these LLMs really only left the lab and hit the mainstream with the debut of ChatGPT in November. 

The GPT-4 (general pre-trained transformer) technology OpenAI offers businesses access via an API license and, through Microsoft’s Azure OpenAI platform, is powering thousands of new AI services - everything from customer service bots to contract analysis in the insurance industry.  

OpenAI’s LLMs are certainly not the only ones available. Google, AWS, Microsoft, IBM, and Meta all have LLMs on offer - mainly as cloud-based services. A growing roster of smaller OpenAI rivals - Anthropic, Stability AI, MosaicML, and Cohere among them, have joined the race. Meta last month released its Llama2 large language model as a freely available open-source tool for users to run and adapt as needed.

Businesses have options and important choices to make. Thankfully, the widespread uptake of Agile software development and CI/CD (continuous integration, continuous delivery) methodologies over the last decade means businesses can experiment with generative AI without throwing significant dollars at projects that ultimately go nowhere.

Gone are the 9 - 12 month waterfall programs of work on a product. Sprints allow you to beta test functionality, trial usage, change, and pivot if necessary. This is how OpenAI and most other LLM developers operate, constantly beta testing and iterating based on the feedback.

What to Consider When Deciding Between LLM Options

Here are six key things to keep in mind when you are surveying the options for deploying LLMs as part of your own products and services.

#1 Task and Use Case

Determine the specific task or use case you intend to use the language model for. Different models might excel in different areas, such as text generation, language translation, summarization, question answering, code generation, etc.

#2 Model Size and Capacity

Larger models generally have more capacity to understand and generate complex language patterns. However, they also require more computational resources and might not be necessary for all tasks. Consider the trade-off between model size and computational resources.

#3 Accuracy and Performance

Evaluate the model's performance on benchmark tasks relevant to your use case. Look for metrics such as accuracy, precision, recall, F1-score, BLEU score (for translation), ROUGE score (for summarization), etc. Consider the speed and latency of the model's responses. Some applications might require near-real-time responses, while others can tolerate longer processing times.

#4 Training Data and Pretraining

Language models are pre-trained on vast amounts of text data. Consider the quality and diversity of the training data. Some models might be more biased due to their training data sources. Consider the ethical implications and whether the model has features or safeguards to mitigate these issues. If you're dealing with sensitive or private data, ensure the model has security features and adheres to data privacy regulations.

#5 Fine-Tuning and Customization

Check if the model can be fine-tuned on your specific domain or task. Customization is important to adapt the model to your specific needs and to improve performance.

#6 Availability and Licensing

Some language models might be available for free, while others require licensing or subscription fees. Make sure the model you choose aligns with your budget and licensing requirements. If you're planning to use the model via an API, consider the ease of integration and the available programming languages or frameworks that are supported.

Accelerance Can Help You Navigate a Fast-Shifting Landscape

Ultimately, the future development potential of a LLM is very important to consider. Is there a strong community of developers and users to draw ideas and resources from? Is there a clear roadmap of future LLM releases and upgrades? The generative AI landscape is shifting so quickly, these are not easy questions to answer.

Ultimately, the best choice of a large language model depends on your specific requirements and constraints. It's a good idea to experiment with different models and evaluate their performance before committing to one for your project.

Learn More in Our New Guide

The rapid evolution of artificial intelligence is transforming the software development landscape, from accelerating coding processes to reshaping outsourcing strategies. Businesses that embrace AI-driven development can gain a competitive edge, but navigating this shift requires a deep understanding of its impact on costs, talent demand, and project efficiency. The 2025 Global Software Outsourcing Rates and Trends Guide from Accelerance explores AI’s profound influence on software development, providing insights into how businesses can leverage outsourcing to stay ahead. 

Download your free copy today to learn how AI is shaping the future of custom software development and how you can adapt your outsourcing strategy for success.