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 Merge Gateway API with up to 16K output tokens.
Capabilities
Input Modalities
textimagepdf
Output Modalities
text
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 Merge Gateway 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
Merge GatewayFamily
gpt
Release Date
Mar 3, 2026
Knowledge Cutoff
Aug 31, 2025
API Integration
NPM Package
merge-gateway-ai-sdk-provider
Environment Variables
MERGE_GATEWAY_API_KEY
API Base URL
https://api-gateway.merge.dev/v1/ai-sdk