GPT-5.5

GPT-5.5 is OpenAI’s flagship large language model designed for advanced coding,
professional reasoning, long-context workflows, and autonomous AI agents.
It delivers stronger reasoning, improved instruction following, better tool usage,
and enhanced multimodal capabilities compared to previous GPT-5 series models.

The model supports a massive 1M+ token context window, enabling complex
long-running tasks such as software engineering, document analysis,
research workflows, enterprise automation, and AI agent systems.
GPT-5.5 also introduces configurable reasoning effort levels for balancing
intelligence and latency in production environments.

• Advanced coding and software engineering capabilities
• 1M+ token long-context processing
• Improved reasoning and instruction following
• Supports tool calling and autonomous agents
• Optimized for enterprise and developer workflows
• Available via OpenAI API, ChatGPT, and Codex