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.
Setup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: openai/gpt-5.1-chatopenai/gpt-5.1-chatRequest example
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
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.
FAQ
What does GPT-5.1 Chat cost on OpenRouter?
On OpenRouter, GPT-5.1 Chat costs $1.25 per 1M input tokens and $10 per 1M output tokens.
What is the context window for GPT-5.1 Chat on OpenRouter?
GPT-5.1 Chat supports a 128k token context window on OpenRouter.
What API model ID do I use for GPT-5.1 Chat on OpenRouter?
Use the model ID openai/gpt-5.1-chat when calling OpenRouter's API.
Who created GPT-5.1 Chat?
GPT-5.1 Chat was created by OpenAI as part of the GPT-5.1 model family.
Is GPT-5.1 Chat open source?
GPT-5.1 Chat is not open source; the seed data lists it as proprietary.