GPT-5.5 API
About
Build advanced reasoning agents with GPT-5.5, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $5.00/1M input and $30.00/1M output tokens, native tool calling support. Access GPT-5.5 via the Azure Cognitive Services API with up to 128K output tokens.
Capabilities
Input Modalities
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Output Modalities
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Limits
Context Window
1.1M
Tokens
Input Limit
922K
Tokens
Max Output
128K
Tokens
Pricing
Standard (per 1M tokens)
Input
$5.00
Output
$30.00
Caching (per 1M tokens)
Read
$0.50
Frequently Asked Questions
GPT-5.5 by Azure Cognitive Services costs $5.00 per 1M input tokens and $30.00 per 1M output tokens. Cached reads cost $0.50 per 1M tokens.
Model Details
ID
gpt-5.5
Provider
Azure Cognitive ServicesFamily
gpt
Release Date
Apr 24, 2026
Knowledge Cutoff
Dec 1, 2025
API Integration
NPM Package
@ai-sdk/azure
Environment Variables
AZURE_COGNITIVE_SERVICES_RESOURCE_NAME
AZURE_COGNITIVE_SERVICES_API_KEY