GPT-5.3 Chat (latest) API
About
Integrate multimodal vision capabilities using GPT-5.3 Chat (latest), 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 GPT-5.3 Chat (latest) via the Opper API with up to 16K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
No
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
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
Caching (per 1M tokens)
Read
$0.17
Frequently Asked Questions
GPT-5.3 Chat (latest) by Opper costs $1.75 per 1M input tokens and $14.00 per 1M output tokens. Cached reads cost $0.17 per 1M tokens.
Model Details
ID
openai/gpt-5.3-chat-latest
Provider
OpperFamily
gpt
Release Date
Mar 3, 2026
Knowledge Cutoff
Aug 31, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
OPPER_API_KEY
API Base URL
https://api.opper.ai/v3/compat