GPT-5.1
VerifiedOpenAI's multimodal model for large-scale image, text, and file processing.
About GPT-5.1
GPT-5.1 processes inputs across image, text, and file modalities. Its 400000-token context window allows handling of extended documents and visual sequences in a single pass. The model remains closed-source with no public parameter count disclosed.
Design choices emphasize unified multimodal understanding rather than separate specialized components. This enables coherent analysis when images, text, and files appear together. Typical usage includes document review, visual question answering, and multi-format data extraction tasks.
Developers integrate GPT-5.1 into pipelines that require long-context multimodal reasoning. The model supports file uploads alongside images and text for consolidated processing. Its closed nature means access occurs exclusively through OpenAI's hosted API.
Capabilities
How GPT-5.1 compares
GPT-5.1 (striped bar) vs other multimodal on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · GPT-5.1 ranks #83 of 122
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long-Context Document Analysis
GPT-5.1 processes up to 400,000 tokens to perform reasoning across multiple lengthy documents or codebases in a single session.
Multimodal Image and Text Workflows
The model combines image analysis with text generation to describe visuals, extract data from diagrams, and produce related written content.
Large-Scale File Processing
It supports ingesting and reasoning over numerous files simultaneously for tasks such as summarization, data extraction, and cross-file comparisons.
Strengths & limitations
Strengths
- +Very large context window
- +Native support for images, text, and files
- +Strong multimodal integration
Limitations
- –No audio or video modalities
- –Performance details unverified beyond specs
- –Potential latency with maximum context
Cost calculator
Estimate what GPT-5.1 would cost for your usage.
Based on GPT-5.1's $1.25/1M input · $10.00/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "openai/gpt-5.1",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: openai/gpt-5.1
Editor's verdict
GPT-5.1 is OpenAI's proprietary multimodal with a 400K-token context window.
At $10.00 per 1M output tokens, it is premium-priced for its class.
It is available through OpenAI's API and aggregators like OpenRouter.
Best suited to very large context window and native support for images, text, and files.
Frequently asked questions
GPT-5.1 provides a context window of 400,000 tokens.
User reviews
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