Azure OpenAI Service - 2025 Models and Features Complete knowledge base for Azure OpenAI Service with latest 2025 models including GPT-5, GPT-4.1, reasoning models, and Azure AI Foundry integration. Overview Azure OpenAI Service provides REST API access to OpenAI's most powerful models with enterprise-grade security, compliance, and regional availability. Latest Models (2025) GPT-5 Series (GA August 2025) Registration Required Models: - : Highest capability, complex reasoning - : Balanced performance and cost - : Optimized for code generation No Registration Required: - : Faster, more afforda…