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OpenAI: GPT-5.1 Chat
openai/gpt-5.1-chat
VisionTool useJSONStreaming
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...
Pricing
Input
$1.25 / 1M
Output
$10.00 / 1M
Specs
Context
128,000 tokens
Input
file, image, text
Output
text
Released: 2025-11
Supported parameters
max_completion_tokensmax_tokensresponse_formatseedstructured_outputstool_choicetools