# gpt-5.1-2025-11-13 — API, pricing & specs via nRouter

> gpt-5.1-2025-11-13 is available through nRouter, the managed LLM gateway: one OpenAI-compatible API key, 0% token markup (exact provider list pricing), 0% platform fee, built-in guardrails, and per-request cost tracking.

## What it is

Snapshot of GPT-5.1 featuring 400K context input and 128K output limits for reliable production agent deployment.

Source: https://platform.openai.com/docs/models/gpt-5.1.md

## Facts

- Maker: OpenAI
- Released: 2025-11-13
- Served on: OpenAI

## nRouter list pricing (exact provider rates, 0% markup)

- Input: $1.25 per 1M tokens
- Output: $10 per 1M tokens

Settled at the exact provider list price above. nRouter adds no per-token markup and charges a 0% platform fee (see https://nrouter.ai/pricing).

## Use it

```python
from openai import OpenAI

client = OpenAI(
    base_url="https://api.nrouter.ai/v1",
    api_key="sk-nrouter-YOUR_KEY",  # create one at https://nrouter.ai/signup
)

response = client.chat.completions.create(
    model="openai/gpt-5.1-2025-11-13",
    messages=[{"role": "user", "content": "Hello"}],
)
```

Model page: https://nrouter.ai/models/gpt-5.1-2025-11-13
Full nRouter index for AI engines: https://nrouter.ai/llms.txt
Docs: https://nrouter.ai/docs