---
title: OpenAI: GPT-5.1-Codex — Context Window and Pricing Guide
canonical: https://prompeteer.ai/models/openai-gpt-5-1-codex
updated: 2026-08-26T00:00:00-07:00
source: OpenRouter /models
---

# OpenAI: GPT-5.1-Codex

OpenAI: GPT-5.1-Codex offers a 400,000-token context window at $1.25 per 1M input tokens and $10.00 per 1M output tokens.

| Attribute | Value |
| --- | --- |
| Context window | 400,000 tokens |
| Input price | $1.25 / 1M |
| Output price | $10.00 / 1M |
| Input modalities | text, image |
| Model id | openai/gpt-5.1-codex |

## FAQ

**What is the context window of OpenAI: GPT-5.1-Codex?**

OpenAI: GPT-5.1-Codex supports up to 400,000 tokens of context.

**How much does OpenAI: GPT-5.1-Codex cost?**

$1.25 per 1M input tokens and $10.00 per 1M output tokens (via OpenRouter /models, as of Aug 26, 2026).

**What input types does OpenAI: GPT-5.1-Codex support?**

OpenAI: GPT-5.1-Codex accepts text, image.

Source: Data via OpenRouter /models — as of Aug 26, 2026.