OpenAI: GPT-5.3 Chat
Chatopenai/gpt-5.3-chatGPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly reduces unnecessary refusals, caveats, and overly cautious phrasing that can interrupt conversational flow.
128K context window
16K max output tokens
Released: 2026-03-03
Supported Protocols:openai
Available Providers:Azure
Capabilities:VisionFunction CallingReasoningPrompt CachingWeb SearchAudio InputVideo InputPDF Input
Pricing
| Type | Price |
|---|---|
| Input Tokens | $1.75/M |
| Output Tokens | $14/M |
| Cache Read | $0.18/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-5.3-chat",messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)
Related Models
Frequently Asked Questions
OpenAI: GPT-5.3 Chat on Ofox.ai costs $1.75/M per million input tokens and $14/M per million output tokens. Pay-as-you-go, no monthly fees.
OpenAI: GPT-5.3 Chat supports a context window of 128K tokens with max output of 16K 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-5.3 Chat 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.