Cost-efficient reasoning model optimized for coding, mathematics, and science with production-ready developer features. Supports function calling, structured outputs, and configurable reasoning effort while maintaining high performance in STEM domains.
- STEM-optimized reasoning excelling in coding, mathematics, and scientific problem-solving
- Production-ready features with function calling, structured outputs, and developer messages
- Configurable reasoning effort with low, medium, and high settings for optimal performance
- Cost-efficient operation delivering advanced reasoning at accessible pricing
- High-performance STEM capabilities achieving competitive results on AIME and coding benchmarks
JSON Mode
Output responses in valid JSON format.
Image Generator
Generate images from text prompts.
Model Information
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.