GPT-5.1 Chat
VerifiedOpenAI multimodal chat model for text, images, and files.
About GPT-5.1 Chat
GPT-5.1 Chat is built as a proprietary multimodal system by OpenAI. It processes text alongside images and files in unified sessions. A 128000-token context window enables longer, coherent exchanges across these modalities.
The model remains closed-weight, so weights are not released publicly. This structure supports focused optimization for file, image, and text handling. Integration occurs through OpenAI's standard API channels for developers.
Common uses involve document review that mixes visual and textual content. Chat interfaces can reference uploaded images or files during extended dialogues. The design prioritizes versatility for mixed-input conversational workflows.
Capabilities
How GPT-5.1 Chat compares
GPT-5.1 Chat (striped bar) vs other multimodal on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · GPT-5.1 Chat ranks #87 of 122
Nova Premier 1.0Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long research document review with visuals
The model processes extended contexts of 128000 tokens while performing image analysis on embedded charts or diagrams to deliver integrated summaries and insights.
Multimodal file-based workflows
It combines file processing with cross-modal reasoning to extract and synthesize information from mixed text and image uploads in a single pass.
Complex multi-turn analytical tasks
Long-context reasoning supports coherent handling of detailed, evolving queries that reference prior multimodal inputs across many exchanges.
Strengths & limitations
Strengths
- +Seamless handling of mixed text, image, and file inputs
- +Effective processing of lengthy documents
- +Strong conversational coherence
- +Versatile reasoning across modalities
Limitations
- –No native support for audio or video
- –May inherit training data biases
- –Performance depends on input quality and clarity
Cost calculator
Estimate what GPT-5.1 Chat would cost for your usage.
Based on GPT-5.1 Chat'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-chat",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: openai/gpt-5.1-chat
Editor's verdict
GPT-5.1 Chat is OpenAI's proprietary multimodal with a 128K-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 seamless handling of mixed text, image, and file inputs and effective processing of lengthy documents.
Frequently asked questions
The model provides a context window of 128000 tokens for handling extended inputs.
User reviews
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