OpenAI: GPT-5.1 Chat
OpenAIenterpriseModerated
openai/gpt-5.1-chatDescription
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...
Specifications
Context Window
128,000
tokens
Max Completion Tokens
16,384
tokens
Input Modalities
fileimagetext
Output Modalities
text
Supported Parameters
max_completion_tokensmax_tokensresponse_formatseedstructured_outputstool_choicetools
Pricing
| Price Type | Rate | Unit |
|---|---|---|
| Input (Prompt) | $0.000001 | per 1M tokens |
| Output (Completion) | $0.000010 | per 1M tokens |
| Web Search | $0.010000 | per query |
| Cache Read | $0.000000 | per 1M tokens |
Tier Availability
Free
Not Available
Pro
Not Available
Enterprise
✓ Available