Published: April 2025 | Source: The Verge

Overview

OpenAI has officially unveiled its latest AI lineup: GPT-4.1, along with two lightweight variants — GPT-4.1 Mini and GPT-4.1 Nano. These models promise not only better performance but also affordability, scalability, and flexibility for developers and businesses worldwide.

Key Features of GPT-4.1 Series

1. Massive Context Window

Supports up to 1 million tokens — a giant leap from GPT-4o’s 128,000 token limit.

Ideal for processing long documents, data analysis, and multi-turn conversations without memory loss.

2. Boosted Performance

Coding capabilities are improved by:

+21% vs GPT-4o
+27% vs GPT-4.5

Improved instruction-following, factual accuracy, and reasoning ability.


3. Cost Efficiency

26% cheaper to operate than GPT-4o.

More accessible for startups, research teams, and app developers.

Introducing Mini & Nano Models

These models maintain OpenAI’s signature performance with significantly lower latency and cost.

Model Transition Timeline

GPT-4 will be retired from ChatGPT by April 30, 2025

GPT-4.5 Preview will be deprecated by July 14, 2025

This streamlining aligns with OpenAI’s strategy to consolidate its offerings around the enhanced GPT-4.1

Why It Matters

This release signals a new phase in AI accessibility — powerful models that don’t compromise on cost or speed. Whether you’re building an enterprise-level app or integrating AI into mobile platforms, the GPT-4.1 lineup delivers.