Microsoft has unveiled the highly anticipated GPT-4.1 series—comprising GPT-4.1, 4.1-mini, and 4.1-nano—across Microsoft Azure OpenAI Service and GitHub, promising significant advancements in artificial intelligence for the developer community. These latest models deliver cutting-edge improvements in coding capabilities, detailed instruction following, and large-context handling, reinforcing Microsoft’s commitment to empowering teams to build smarter, more efficient AI solutions.

What is GPT-4.1?

GPT-4.1 stands as the newest evolution of the GPT-4o model, meticulously trained to excel in coding and instruction-following scenarios. Designed with developers in mind, GPT-4.1 boosts the quality and productivity of agentic workflows—making it a major asset for teams working on automation, complex technical tasks, and multi-step AI agents.

Key Features and Major Advancements

1. Superior Coding and Instruction Following

The GPT-4.1 models are fine-tuned to better address complex coding problems and technical instructions. Developers can expect:

• Cleaner, simpler front-end code generation
• Improved accuracy in identifying code modifications
• Consistently executable outputs

2. One-Million Token Context

With the ability to process up to one million tokens in a single request, GPT-4.1 dramatically improves the handling of extensive input data. This is a game-changer for use cases that require remembering long threads, analyzing detailed documents, or enabling agents to reason over large blocks of context as workflows evolve.

3. Enhanced Instruction Following

The model is even better equipped for following detailed, multi-part instructions—making it more intuitive and collaborative for advanced applications such as workflow automation, document analysis, and large-scale code refactoring.

Model Capabilities and Options

Alongside post-training improvements, GPT-4.1 maintains all API capabilities of the GPT-4o family, including tool calling and structured output support. Microsoft now offers three versions for developers and enterprises:

Fine-Tuning Support: Custom AI for Your Business

In an exciting development, Microsoft is rolling out supervised fine-tuning for GPT-4.1 and 4.1-mini. Businesses can soon securely train these models on their own data, tailoring responses to match company tone, industry-specific terminology, and unique workflow requirements. Fine-tuned models are managed and deployed through Azure AI Foundry, granting full control over versioning, security, and scaling.

Explore GPT-4.1 on Azure OpenAI Service

GPT-4.1 is now generally available via Azure OpenAI Service, opening new frontiers for developers and organizations across industries. This release sets a new benchmark for AI performance, efficiency, and flexibility. Whether you’re enhancing chatbots, building analytics tools, or pioneering new machine learning use cases, GPT-4.1 and its variants equip you with powerful capabilities to innovate faster and smarter.