We are excited to share the launch of the next iteration of the GPT model series with GPT-4.1, 4.1-mini, and 4.1-nano to Microsoft Azure OpenAI Service and GitHub. The GPT-4.1 models bring improved capabilities and significant advancements in coding, instruction following, and long-context processing that is critical for developers. We’re also excited to announce fine-tuning support for GPT-4.1 and 4.1-mini, allowing developers to further customize the models for their specific business needs.
What is GPT-4.1?
GPT-4.1 is the latest iteration of the GPT-4o model, trained to excel at coding and instruction-following tasks. This model will improve the quality of agentic workflows and accelerate the productivity of developers across all scenarios.
Key features of GPT-4.1
GPT-4.1 brings several notable improvements:
- Enhanced coding and instruction following: The model is optimized for better handling of complex technical and coding problems. It generates cleaner, simpler front-end code, accurately identifies necessary changes in existing code, and consistently produces outputs that compile and run successfully.
- Long context model: GPT-4.1 supports one million token inputs, allowing it to process and understand extensive context in a single interaction. This capability is particularly beneficial for tasks requiring detailed and nuanced understanding as well as multi-step agents that increase context as they operate.
- Improved instruction following: The model excels at following detailed instructions, especially agents containing multiple requests. It is more intuitive and collaborative, making it easier to work with for various applications.
Model capabilities
In addition to the post-training improvements and long context support, GPT-4.1 retains the same API capabilities as the GPT-4o model family, including tool calling and structured outputs.
| Model | Reasoning & Accuracy | Cost & Efficiency | Context Length |
| GPT-4.1 | Highest | Higher Cost | 1M |
| GPT-4.1-mini | Balanced | Balanced | 1M |
| GPT-4.1-nano | Lower | Lowest Cost | 1M |
Coming soon: Fine-tune GPT-4.1 to your business needs
Later this week, we’ll be enabling supervised fine-tuning for GPT-4.1 and 4.1-mini, empowering developers to adapt these models to their unique business requirements. Fine-tuning enables you to securely customize the base models on your own datasets, helping align responses with your organization’s specific tone, domain terminology, and task workflows. Fine-tuned models are managed and deployed through the Azure AI Foundry, giving you full control over versioning, security, and scalability.
Explore GPT-4.1 today
GPT-4.1 is now available on Azure OpenAI Service, bringing unparalleled advancements in AI capabilities. This release marks a significant leap forward, offering enhanced performance, efficiency, and versatility across a wide array of applications. Whether you’re looking to improve your customer service chatbot, develop cutting-edge data analysis tools, or explore new frontiers in machine learning, GPT-4.1 has something to offer.
We invite you to delve into the new features and discover how GPT-4.1 can revolutionize your workflows and applications. Explore, deploy, and build applications using these models today in Azure AI Foundry to access this powerful tool and stay ahead in the rapidly evolving world of AI.
