Latest small reasoning model in the o-series optimized for fast, effective reasoning with exceptional performance in coding and visual tasks. Features streaming support and configurable reasoning effort levels for optimal cost-performance balance.
- Advanced reasoning capabilities optimized for speed and effectiveness in technical domains
- Exceptional coding performance with superior debugging and development assistance
- Visual task proficiency handling complex image analysis and visual reasoning
- Configurable reasoning effort with adjustable complexity levels for cost optimization
- Streaming support enabled for real-time interactions and responsive user experiences
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Model Information
Supported Formats
GPT 5.5OpenAI's most advanced model released April 2026. GPT-5.5 is recommended for most reasoning workloads, combining frontier intelligence with configurable reasoning effort (none → xhigh). Available in API, Codex, and ChatGPT.
GPT 5.5 ProHighest-intelligence API option in the GPT-5.5 family. Use for the most challenging problems that require maximum reasoning depth and can tolerate higher latency. Supports full reasoning effort range from none to xhigh.
GPT 5.4GPT-5.4 is OpenAI's frontier model for complex professional work, designed for agentic, coding, and professional workflows with the highest reasoning capability. Features a 1.05M token context window, native computer use, and built-in support for web search, file search, and MCP.