GPT-5.1 Instant
GPT-5.1 Instant is designed for ultra-low latency responses, making it ideal for real-time applications like autocomplete, inline suggestions, and interactive search. It prioritizes speed while maintaining solid generation quality.
Instant is the fastest model in the GPT-5.1 lineup, optimized for scenarios where time-to-first-token is the primary constraint.
Key Features
Ultra-low latency for real-time applications
Sub-100ms time to first token
Solid generation quality at high speed
128K token context window
Function calling support
Ideal Use Cases
Autocomplete and inline suggestion systems
Real-time interactive search
Live conversational AI
High-throughput processing pipelines
Technical Specifications
| Context Window | 128K tokens |
| Modality | Text → Text |
| Provider | OpenAI |
| Category | Text Generation |
| Latency | Sub-100ms TTFT |
| Best For | Real-time applications |
API Usage
1 curl -X POST https://api.vincony.com/v1/chat/completions \ 2 -H "Authorization: Bearer YOUR_API_KEY" \ 3 -H "Content-Type: application/json" \ 4 -d '{ 5 "model": "openai/gpt-5.1-instant", 6 "messages": [ 7 { "role": "user", "content": "Hello, GPT-5.1 Instant!" } 8 ] 9 }'
Replace YOUR_API_KEY with your Vincony API key. OpenAI-compatible endpoint — works with any OpenAI SDK.
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Frequently Asked Questions
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