Last refreshed 2026-06-15. Next refresh: weekly.
Why use GPT-5.3 Chat on OpenRouter?
OpenRouter offers GPT-5.3 Chat with pay-as-you-go pricing at $1.75/1M input tokens. OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Compare GPT-5.3 Chat across 3 providers to find the best fit for your use caseInput / 1M
$1.75
Output / 1M
$14.00
Cache
Not sourced
Batch
Not sourced
Setup recipe
Docs fallbackInstall
Use the provider REST API or SDKAuth
Create a provider API keyCall
model: openai/gpt-5.3-chatModel ID
openai/gpt-5.3-chatRequest example
Curated snippets for this provider are not sourced yet. Use OpenRouter documentation with model ID
openai/gpt-5.3-chat.Gotchas
- Use provider model ID "openai/gpt-5.3-chat", not the LLMReference slug "gpt-5.3-chat".
Compare GPT-5.3 Chat Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| OpenAI API | $1.75 | $14.00 |
| Vercel AI Gateway | $1.75 | $14.00 |
| OpenRouter | $1.75 | $14.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.75 |
| Output tokens | $14.00 |
Capabilities
VisionMultimodalJSON / Tool useStructured OutputsPrompt Caching
About GPT-5.3 Chat
GPT-5.3's conversational model, marketed as GPT-5.3 Instant. Available via the OpenAI API as gpt-5.3-chat-latest and in Azure AI Foundry as gpt-5.3-chat preview. Released March 3, 2026 as an update to ChatGPT's default model with reduced hallucinations, anti-sycophancy alignment, and faster short-prompt responses. GPT-5.5 Instant succeeded it as ChatGPT's default model on May 5, 2026.
Get Started
Model Specs
Released2026-03-03
Context128k
ArchitectureDecoder Only
Knowledge cutoff2025-08