GPT-4.1

Overview

GPT-4.1 is OpenAI's best non-reasoning model — optimized for instruction following, tool calling, and fast, reliable output without the latency overhead of a reasoning step. With a 1 million token context window and a refreshed knowledge cutoff of June 2024, it is the go-to model for applications that need broad general intelligence and strong instruction compliance at lower latency than the GPT-5 series. It represents a significant context window expansion over earlier GPT-4 variants while maintaining the responsiveness that makes GPT-4-class models popular for real-time applications.

GPT-4.1 sits in OpenAI's lineup as the practical workhorse for developers who need reliable, fast output without paying for or waiting on GPT-5.2's extended reasoning chains.

Specifications

• Developer: OpenAI
• Model String: gpt-4.1
• Release Date: 2025
• Type: Large Language Model (LLM), Multimodal (text + vision)
• Context Window: 1,000,000 tokens
• Knowledge Cutoff: June 2024
• Access: OpenAI API, Azure OpenAI Service
• Pricing: See OpenAI pricing page for current rates

Capabilities

Instruction Following: GPT-4.1's headline strength is precise, reliable instruction following — it excels at following complex, multi-part instructions accurately and consistently, making it strong for structured tasks, form filling, data extraction, and workflows that depend on predictable output formats.

Tool Calling: Best-in-class for function calling and tool use workflows. Particularly well-suited for agentic pipelines where the model needs to select and invoke tools reliably across many steps.

1M Token Context: Holds approximately 750,000 words of context simultaneously — practical for large document analysis, long codebases, or extended conversation histories without chunking.

Low Latency: No reasoning step means fast time-to-first-token — critical for real-time applications, chatbots, and interactive tools where response speed matters.

Vision: Supports image input for document analysis, chart reading, and visual question answering.

Limitations

As a non-reasoning model, GPT-4.1 handles straightforward tasks well but lacks the extended analytical depth of GPT-5.2 Thinking or OpenAI's o-series models for hard reasoning problems. For tasks requiring step-by-step logical chains — complex math, multi-step planning under uncertainty, or novel problem solving — a reasoning model will outperform it. Knowledge cutoff of June 2024 means it requires tool augmentation for current events or recent information.

Recent Developments

• 1M Context Window: The expansion to 1 million tokens (from 128K in GPT-4o) significantly expands its practical range for large-document and large-codebase use cases.
• Positioned Alongside GPT-5.2: OpenAI maintains GPT-4.1 as the preferred choice for latency-sensitive, instruction-heavy production workloads, while GPT-5.2 is positioned for knowledge work requiring deeper reasoning.

Last Updated

February 26, 2026