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Kilo Gateway

OpenAI: GPT-5.1 API

Kilo Gateway
About

Build advanced reasoning agents with OpenAI: GPT-5.1, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.25/1M input and $10.00/1M output tokens, native tool calling support. Access OpenAI: GPT-5.1 via the Kilo Gateway API with up to 128K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
400K

Tokens

Input Limit
400K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$1.25
Output
$10.00

Caching (per 1M tokens)

Read
$0.13
Frequently Asked Questions

OpenAI: GPT-5.1 by Kilo Gateway costs $1.25 per 1M input tokens and $10.00 per 1M output tokens. Cached reads cost $0.13 per 1M tokens.

Model Details
ID
openai/gpt-5.1
Provider
Kilo Gateway
Family
Release Date
Nov 13, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
KILO_API_KEY
API Base URL
https://api.kilo.ai/api/gateway
Documentation