OpenAI: GPT-5.3 Chat API
About
Integrate multimodal vision capabilities using OpenAI: GPT-5.3 Chat, designed to process both text and images seamlessly. This model delivers cost-effective pricing at $1.75/1M input and $14.00/1M output tokens, native tool calling support. Access OpenAI: GPT-5.3 Chat via the Kilo Gateway API with up to 16K output tokens.
Capabilities
Input Modalities
imagepdftext
Output Modalities
text
Reasoning
No
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
128K
Tokens
Input Limit
128K
Tokens
Max Output
16K
Tokens
Pricing
Standard (per 1M tokens)
Input
$1.75
Output
$14.00
Frequently Asked Questions
OpenAI: GPT-5.3 Chat by Kilo Gateway costs $1.75 per 1M input tokens and $14.00 per 1M output tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
KILO_API_KEY
API Base URL
https://api.kilo.ai/api/gateway