GPT-5.5 was introduced on April 23, 2026 as a general-purpose model intended to take on messy, multi-part tasks that require planning, tool use, and self-checking rather than step-by-step prompting. The release positions it as a step toward a new way of getting work done on a computer, with particular strength in agentic coding, computer use, knowledge work, and early scientific research. According to OpenAI's announcement, it excels at writing and debugging code, researching online, analyzing data, creating documents and spreadsheets, operating software, and moving across tools until a task is finished, while still matching GPT-5.4 per-token latency in real-world serving despite operating at a higher level of intelligence.

In practice, GPT-5.5 is shaped for teams that want a single model to carry a workflow end-to-end, from interpreting intent and navigating ambiguity to checking its own work and continuing across long sequences of actions. The companion system card, updated alongside the API release on April 24, 2026, covers additional safeguards that apply to GPT-5.5 and GPT-5.5 Pro. The result is a model aimed less at turn-by-turn assistance and more at autonomous, goal-driven execution, making it a natural fit for coding agents, research assistants, and productivity tools that need to integrate document creation, data analysis, and software operation.