AI

GPT-4.1

Model Overview

GPT-4.1 is a family of large language models released by OpenAI on April 14, 2025. It was designed to enhance the performance of previous models like GPT-4o and GPT-4.5, offering superior coding capabilities, a massive context window, and better instruction following. Note: As of July 9, 2026, OpenAI has officially retired the GPT-4.1 series from ChatGPT and the API.

Capabilities

• Massive Context Window: Supports a 1 million token context window across all models in the family, a significant increase over the 128K limit of predecessor models.
• Advanced Coding & Reasoning: Features substantial gains in software engineering tasks and complex reasoning, scoring high on benchmarks like SWE-bench Verified.
• Reliable Instruction Following: Exhibits enhanced reliability in adhering to complex prompts, constraints, and generating structured outputs.
• Efficient Variants: Includes GPT-4.1 mini (optimized for efficiency) and GPT-4.1 nano (the fastest, most cost-effective variant for high-throughput tasks).

Example Use Cases

• Large-Scale Document Analysis: Utilizing the 1 million token context window to process and analyze massive legal, financial, or technical documents in a single prompt.
• Advanced Software Development: Assisting engineers with complex coding tasks, bug fixing across large codebases, and architectural design using its improved reasoning capabilities.
• Automated Data Processing: Relying on its strong instruction-following to reliably generate structured JSON outputs or parse complex datasets in production pipelines.

Performance & Benchmarks

GPT-4.1 was specifically engineered to improve upon the performance of its predecessors, with notable, significant gains in software engineering benchmarks like SWE-bench Verified. It stood as OpenAI's smartest non-reasoning model at the time of its release, though specific parameter counts remain undisclosed.

Intended Use & Limitations

Initially intended for complex reasoning, coding, and large-context tasks via the OpenAI API and ChatGPT tiers. Important Limitation: The GPT-4.1 series is now retired (as of July 2026) and represents a deprecated generation of OpenAI's models. Users building new applications are encouraged to migrate to newer model families (e.g., the o-series or GPT-5.x).

About OpenAI

OpenAI is an AI research and deployment company dedicated to ensuring that artificial general intelligence benefits all of humanity. They are the creators of the GPT series of large language models and ChatGPT, consistently pushing the boundaries of natural language processing and generative AI.