GPT 5.1
gpt-5.1
GPT-5.1 is a next-generation large language model that delivers high-fidelity understanding, richer context handling, improved instruction fidelity and deeper reasoning.
GPT-5.1 is a next-generation large language model that delivers high-fidelity understanding, richer context handling, improved instruction fidelity and deeper reasoning.
Reasoning
Higher
Speed
Medium
Price
$1.00 • $8.00
Input • Output
Input
Text, Image
Output
Text
GPT-5.1 built for both conversational use-cases and multi-step agentic workflows, it supports long-context inputs, fine control over style/voice, and robust tool/function invocation.
400000 context window
100000 max output tokens
knowledge cutoff
Reasoning token support
Modalities
Text
Input and output
Image
Input only
Audio
Not supported
Video
Not supported
Endpoints
Chat Completions
v1/chat/completions
Responses
v1/responses
Realtime
v1/realtime
Assistants
v1/assistants
Batch
v1/batch
Fine-tuning
v1/fine-tuning
Embeddings
v1/embeddings
Image generation
v1/images/generations
Videos
v1/videos
Image edit
v1/images/edits
Speech generation
v1/audio/speech
Transcription
v1/audio/transcriptions
Translation
v1/audio/translations
Moderation
v1/moderations
Completions (legacy)
v1/completions
Features
Streaming
Supported
Function calling
Supported
Structured outputs
Supported
Fine-tuning
Supported
Distillation
Not supported