GPT-4o

GPT-4o December snapshot with improved real-time audio mode quality and enhanced JSON schema structured output compliance.

GPT-4o October snapshot with vision improvements and better performance on document understanding tasks.

GPT-4o August 2025 snapshot with improved structured output reliability and expanded multilingual performance.

November snapshot with improved instruction following and reduced verbosity.

GPT-4o August snapshot adds structured outputs (JSON Schema) and improved function calling accuracy.

OpenAI released GPT-4o, a multimodal model delivering 2x faster inference than GPT-4 Turbo at 50% lower cost with 128K context window and improved non-English language capabilities.