Back to all models
openai
openaiOpenAI: GPT-5.1 Chat
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
openai/gpt-5.1-chat
Context Size
128K
Input Price
187,500 pts/M
Output Price
1,500,000 pts/M
Architecture
File
Image
Text
Supported Parameters
max_completion_tokensmax_tokensresponse_formatseedstructured_outputstool_choicetools
Details
TokenizerGPT
Max Completion32,000 tokens
Provider Context128K tokens
ModeratedNo
CreatedNov 13, 2025