OpenAI: GPT-5.1 Codex Max
Chatopenai/gpt-5.1-codex-maxGPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows spanning software engineering, mathematics, and research.
256K context window
128K max output tokens
Released: 2025-12-04
Supported Protocols:openai
Available Providers:Azure
Capabilities:VisionFunction CallingReasoningPrompt CachingWeb SearchAudio InputVideo InputPDF Input
Pricing
| Type | Price |
|---|---|
| Input Tokens | $1.25/M |
| Output Tokens | $10/M |
| Cache Read | $0.13/M |
| Web Search | $0.01/R |
Code Examples
from openai import OpenAIclient = OpenAI(base_url="https://api.ofox.ai/v1",api_key="YOUR_OFOX_API_KEY",)response = client.chat.completions.create(model="openai/gpt-5.1-codex-max",messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)
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Frequently Asked Questions
OpenAI: GPT-5.1 Codex Max on Ofox.ai costs $1.25/M per million input tokens and $10/M per million output tokens. Pay-as-you-go, no monthly fees.
OpenAI: GPT-5.1 Codex Max supports a context window of 256K tokens with max output of 128K tokens, allowing you to process large documents and maintain long conversations.
Simply set your base URL to https://api.ofox.ai/v1 and use your Ofox API key. The API is OpenAI-compatible — just change the base URL and API key in your existing code.
OpenAI: GPT-5.1 Codex Max supports the following capabilities: Vision, Function Calling, Reasoning, Prompt Caching, Web Search, Audio Input, Video Input, PDF Input. Access all features through the Ofox.ai unified API.