Using GPT-5.3 Chat on OpenRouter

Quick Start

1. 1
   Create an account at OpenRouter and generate an API key.
2. 2
   Use the OpenRouter SDK or REST API to call openai/gpt-5.3-chat — see the documentation for request format.
3. 3
   You'll be billed $1.75/1M input, $14.00/1M output tokens. See full pricing.

Code Examples

About OpenRouter

OpenRouter provides a unified interface for Large Language Models with better pricing, improved uptime, and no subscription requirements. Route across providers for cost optimization and reliability.

Multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.

Pricing on OpenRouter

Capabilities

About GPT-5.3 Chat

GPT-5.3 Chat is an update to ChatGPT's most-used model making everyday conversations smoother and more useful, optimized for low-latency multimodal dialogue at 128K context.