> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.deepmask.io/llms.txt
> Use this file to discover all available pages before exploring further.

# GPT-4.1 

> OpenAI's precision and context specialist. 1M token window, GPQA 66.6%, 0.62s TTFT, 91 tok/s. Best for large document processing and spreadsheets.

GPT-4.1 is OpenAI's 2025/2026 reliability update to the GPT-4 family, built for situations where precision and context depth matter more than raw reasoning power. With a standardized 1-million-token context window and industry-leading instruction adherence, it is the model to reach for when you need something that reliably "follows the rules" without over-explaining.

## About GPT-4.1

Where newer models focus on "thinking," GPT-4.1 focuses on **precision and context**. It achieves 99%+ "Needle in a Haystack" performance across its full 1M token range and scores 38% higher than GPT-4o on MultiChallenge — a benchmark measuring the ability to follow multi-turn constraints. It is significantly faster and more cost-efficient than the older GPT-4o, making it the preferred choice for developers who need reliable, high-volume processing.

## Key Capabilities

<CardGroup cols={2}>
  <Card title="Perfect Context Recall" icon="database">
    99%+ needle-in-a-haystack performance across the full 1M token range, ensuring nothing gets lost in long documents.
  </Card>

  <Card title="Literal Instruction Following" icon="list-check">
    Scores 38% higher than GPT-4o on MultiChallenge — ideal for workflows with strict multi-turn constraints.
  </Card>

  <Card title="High-Volume Translation" icon="globe">
    Native support for 110+ languages with culturally specific nuance, suited for enterprise localization pipelines.
  </Card>

  <Card title="Zero-Shot JSON" icon="brackets-curly">
    Highly reliable at generating valid structured data for system integrations, reducing downstream parsing failures.
  </Card>
</CardGroup>

## Best For

GPT-4.1 is the right choice when you need to process very large documents, maintain strict output formats, or follow complex multi-turn instructions without drift. It handles spreadsheets, codebase audits, and content moderation pipelines particularly well. For tasks that require real-time voice or visual reasoning, GPT-4o is more appropriate. For the highest reasoning depth, consider the GPT-5 series.

<Tip>
  When ingesting multiple large documents, batch them into a single request using GPT-4.1's 1M context window rather than chaining multiple calls — this preserves cross-document context and reduces cost.
</Tip>

## Use Cases

* **Log analysis** — Ingest months of server logs in a single pass to find root causes of errors.
* **Repository audits** — Index and summarize an entire company codebase for technical debt reviews.
* **Content moderation** — Process large batches of text and images with consistent judgment.

## Specifications

| Specification  | Value                                                       |
| -------------- | ----------------------------------------------------------- |
| Provider       | OpenAI                                                      |
| Context Window | 1.0M tokens                                                 |
| Reasoning      | Medium-High                                                 |
| GPQA Diamond   | 66.6%                                                       |
| Latency (TTFT) | 0.62s                                                       |
| Throughput     | 91 tokens/sec                                               |
| Key use cases  | Long documents, spreadsheets, code refactoring, translation |

[Try GPT-4.1 in DeepMask →](https://chat.deepmask.io/)