Last refreshed 2026-06-15. Next refresh: weekly.
Why use GPT-5.1 on OpenRouter?
OpenRouter offers GPT-5.1 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-5.1Model ID
openai/gpt-5.1Request example
Curated snippets for this provider are not sourced yet. Use OpenRouter documentation with model ID
openai/gpt-5.1.Gotchas
- Use provider model ID "openai/gpt-5.1", not the LLMReference slug "gpt-5.1".
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.25 |
| Output tokens | $10.00 |
| Image input | $1.00 |
Capabilities
VisionMultimodalReasoningJSON / Tool useStructured Outputs
About GPT-5.1
OpenAI's GPT-5.1 is the main thinking model in the GPT-5.1 family, released November 13, 2025 via API (ChatGPT rollout began November 12, 2025). Features adaptive reasoning that dynamically adjusts thinking time by task complexity, with a reasoning_effort parameter supporting none/low/medium/high settings. Deprecated in ChatGPT as of March 11, 2026 in favor of newer models.
Get Started
Model Specs
Released2025-11-13
Context262k