OpenAI · Model identity
GPT-5.1
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
2pricing routes
What published route metadata supports
CachingFile inputReasoningStructured outputTool useVisionWeb search
Input modalities
FilesImageText
Supported API parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools
Only source-backed fields are filled
Release dateNot independently verified
Knowledge cutoffNot independently verified
Open weightsNot independently verified
OpenRouter catalog date2025-11-13
LLMPrice does not infer a release date, knowledge cutoff, or open-weight status from a model name, Hugging Face link, or pricing route.
Could this workload cost less?Compare GPT-5.1 with cheaper models using the same workload.
Find cheaper alternatives →| Endpoint / route | Model ID | Input | Cached | Output | Context | Source |
|---|---|---|---|---|---|---|
| OpenRouterBatch | openai/gpt-5.1:batch | $0.625 | $0.0625 | $5 | 400K | OpenRouter API ↗ |
| OpenRouterStandard | openai/gpt-5.1 | $1.25 | $0.125 | $10 | 400K | OpenRouter API ↗ |
0 verified price changes since Aug 26, 2026
2 route availability changes recorded. No earlier prices are inferred.
- Sep 1, 2026OpenRouter · Batch
New pricing route added
- Aug 28, 2026OpenRouter · Batch
Pricing route removed