ModelsGPT-5.1 Instant

GPT-5.1 Instant

by OpenAI

Premium

Complex reasoning, large context, state-of-the-art performance

Pricing
Input
$1.25
per 1M tokens
Output
$10.00
per 1M tokens
Cached
$0.125
per 1M tokens
Note: Released Nov 12, 2025. Most-used model with adaptive reasoning capability
Context & Output
Context Window272K tokens
Max Output128K tokens
Latency
Fast
Capabilities
Multimodal
Streaming
Function Calling
Prompt Caching
Key Strengths
What makes this model stand out
Adaptive reasoning
Warmer & conversational
More accurate
Try GPT-5.1 InstantCompare All Models
Similar Models in Premium Tier
Other models with similar pricing and performance characteristics
Kimi K2 Thinking
Moonshot AI
Input:$0.80/M
Context:256K tokens
View Details
Claude Opus 4.1
Anthropic
Input:$15.00/M
Context:1M tokens
View Details
Gemini 2.5 Pro
Google
Input:$1.25*/M
Context:1M tokens
View Details