OpenAI

OpenAI: GPT-5.3 Chat

Chat-15%
openai/gpt-5.3-chat
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GPT-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:OpenAIopenai
Available Providers:AzureAzure
Capabilities:VisionFunction CallingReasoningPrompt CachingWeb SearchAudio InputVideo Input

Providers

AzureAzure
-15%
Input Tokens
$1.49/M
$1.75/M
Output Tokens
$11.9/M
$14/M
Cache Read
$0.153/M
$0.18/M
Web Search
$0.01/R
Protocols
OpenAIopenai/v1/chat/completions/v1/responses

Code Examples

from openai import OpenAI


client = 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)

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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.