LLMs

GPT-5.1 API

GPT-5.1 is an upgrade to the GPT-5 family, designed to be more intelligent, more conversational, and easier to personalize. It improves on GPT-5 in both capability and communication style. GPT-5.1 adapts its reasoning effort dynamically, responding quickly to simple requests while thinking more deeply on complex ones. It also integrates refined steering controls so users can customize ChatGPT's tone and personality with ease.

1RPC.ai

Reasoning

Speed

$1.25/$10.00

Input/Output

400,000Context Window

Implement

Get started with an API-friendly relay

Send your first request to verified LLMs with a single code snippet.

import requests
import json
response = requests.post(
    url="https://api.1rpc.ai/v1/chat/completions",
    headers={
        "Authorization": "Bearer <1RPC_AI_API_KEY>",
        "Content-type": "application/json",
    },
    data=json.dumps({
        "model": "gpt-5.1",
        "messages": [
            {
                "role": "user",
                "content": "What is the meaning of life?"
            }
        ]
    })
)
print(response.json())

Pricing

Estimate Usage Across Any AI Model

Adjust input and output size to estimate token usage and costs.

GPT-5.1 Token Costs Calculator

Input tokens≈ 7,500 words

Output tokens≈ 75,000 words

$1.0125Total cost per million tokens

Learn about Pricing