openai/gpt-5.1-chat
Model Card
GPT-5.1 Chat is the conversational variant of GPT-5.1 used in ChatGPT with a warmer personality by default. It's available as gpt-5.1-chat-latest in the API for non-reasoning chat interactions.
Context Window 128K
tokens
Max Output 16K
tokens
Input Cost $1.25
per million tokens
Output Cost $10
per million tokens
Input text, image
modalities
Tool Use Yes
Knowledge Cutoff Sep 30, 2024
Release Date Nov 13, 2025
API Usage Example
Add GPT-5.1 Chat to your app with just a few lines of code.
No backend, no configuration required.
// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms", {
model: "openai/gpt-5.1-chat"
}).then(response => {
document.body.innerHTML = response.message.content;
});
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain quantum computing in simple terms", {
model: "openai/gpt-5.1-chat"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
# pip install openai
from openai import OpenAI
client = OpenAI(
base_url="https://api.puter.com/puterai/openai/v1/",
api_key="YOUR_PUTER_AUTH_TOKEN",
)
response = client.chat.completions.create(
model="openai/gpt-5.1-chat",
messages=[
{"role": "user", "content": "Explain quantum computing in simple terms"}
],
)
print(response.choices[0].message.content)
curl https://api.puter.com/puterai/openai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_PUTER_AUTH_TOKEN" \
-d '{
"model": "openai/gpt-5.1-chat",
"messages": [
{"role": "user", "content": "Explain quantum computing in simple terms"}
]
}'
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Frequently Asked Questions
You can access GPT-5.1 Chat by OpenAI through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.
Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add GPT-5.1 Chat to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.
| Price per 1M tokens | |
|---|---|
| Input | $1.25 |
| Output | $10 |
GPT-5.1 Chat was created by OpenAI and released on Nov 13, 2025.
GPT-5.1 Chat supports a context window of 128K tokens. For reference, that is roughly equivalent to 256 pages of text.
GPT-5.1 Chat can generate up to 16K tokens in a single response.
GPT-5.1 Chat has a knowledge cutoff date of Sep 30, 2024. This means the model was trained on data available up to that date.
GPT-5.1 Chat accepts the following input types: text, image. It produces: text.
Yes, GPT-5.1 Chat supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.
Yes — the GPT-5.1 Chat API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.
Get started with Puter.js
Add GPT-5.1 Chat to your app without worrying about API keys or setup.
Read the Docs View Tutorials