GPT-5.5 is designed for complex, multi-part knowledge work, especially coding, online research, information analysis, document and spreadsheet creation, and operating software. It is intended to interpret a request earlier, navigate ambiguity, select and use tools, verify its work, and continue until the task is complete. This makes it a strong fit for workflows that combine reasoning with action over multiple steps rather than isolated, single-turn requests.

The model shows particular strength in agentic coding, computer use, general knowledge work, and early scientific research. OpenAI reports that it matches GPT-5.4 per-token latency in real-world serving, operates at a higher level of capability, and uses significantly fewer tokens for the same Codex tasks, indicating a focus on completing work efficiently as well as handling more complex tasks.