Last refreshed 2026-06-15. Next refresh: weekly.
Why use GPT-5.1 Chat on OpenRouter?
OpenRouter offers GPT-5.1 Chat with pay-as-you-go pricing at $1.25/1M 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.
Input / 1M
$1.25
Output / 1M
$10.00
Cache
read $0.13
Batch
Not sourced
Setup recipe
Docs fallbackInstall
Use the provider REST API or SDKAuth
Create a provider API keyCall
model: openai/gpt-5.1-chatModel ID
openai/gpt-5.1-chatRequest example
Curated snippets for this provider are not sourced yet. Use OpenRouter documentation with model ID
openai/gpt-5.1-chat.Gotchas
- Use provider model ID "openai/gpt-5.1-chat", not the LLMReference slug "gpt-5.1-chat".
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.25 |
| Output tokens | $10.00 |
| Image input | $1.00 |
Capabilities
VisionMultimodalJSON / Tool useStructured Outputs
About GPT-5.1 Chat
GPT-5.1 Chat is the fast, lightweight conversational member of the GPT-5.1 family, optimized for low-latency chat at 128K context.
Get Started
Model Specs
Released2025-12-01
Context128k
ArchitectureDecoder Only
Knowledge cutoff2024-09