GPT-5.1 Codex (Azure) API
About
Build advanced reasoning agents with GPT-5.1 Codex (Azure), 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 GPT-5.1 Codex (Azure) via the LLM Gateway API with up to 272K output tokens.
Capabilities
Input Modalities
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Output Modalities
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Reasoning
Yes
Structured Output
Limits
Context Window
400K
Tokens
Input Limit
272K
Tokens
Max Output
272K
Tokens
Pricing
Standard (per 1M tokens)
Input
$1.25
Output
$10.00
Frequently Asked Questions
GPT-5.1 Codex (Azure) by LLM Gateway costs $1.25 per 1M input tokens and $10.00 per 1M output tokens.
Model Details
ID
azure/gpt-5.1-codex
Provider
LLM GatewayFamily
gpt-codex
Release Date
Nov 13, 2025
Knowledge Cutoff
Sep 30, 2024
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
LLMGATEWAY_API_KEY
API Base URL
https://api.llmgateway.io/v1