OpenAI has officially introduced GPT-5.5, its most advanced large language model to date, succeeding previous rumors and internal codenames. This new iteration remarkably outperforms rival models including Anthropic’s Claude Opus 4.7 and narrowly surpasses Claude Mythos Preview on the Terminal-Bench 2.0 benchmark, which evaluates a model’s ability to operate in a terminal environment. The model enhances autonomous task handling, coding, scientific research, and professional computing tasks with significant efficiency improvements thanks to a hardware-software co-design. GPT-5.5 comes in two versions: a standard model and a Pro variant, the latter aimed at highly demanding tasks such as legal, data science, and business analytics. Although API access is not yet available, the model is accessible to users subscribed to various ChatGPT paid tiers. Pricing has increased compared to prior versions, reflecting the model’s advanced capabilities. OpenAI has also introduced a “cyber-permissive” license for verified security professionals, balancing AI’s defensive benefits with potential risks. Reception from early users highlights substantial advances in code conceptual clarity and workflow autonomy. OpenAI’s team underscores ongoing potential for further model improvements beyond this release.
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