OpenAI announced the release of GPT‑5.5, which the company describes as its most advanced AI model to date. The model is now available to Plus, Pro, Business, and Enterprise users through ChatGPT and Codex platforms.

According to benchmark results provided by OpenAI, GPT‑5.5 achieved 82.7% accuracy on Terminal-Bench 2.0, which tests command-line workflows, and 58.6% on SWE-Bench Pro, which evaluates GitHub issue resolution. The model also scored 73.1% on Expert-SWE, OpenAI's internal evaluation for coding tasks with an estimated 20-hour completion time.

The company reports that GPT‑5.5 maintains the same per-token latency as its predecessor GPT‑5.4 while using fewer tokens to complete similar tasks. The model was developed using NVIDIA GB200 and GB300 NVL72 systems.

For professional applications, GPT‑5.5 scored 84.9% on GDPval, which tests knowledge work across 44 occupations, and 78.7% on OSWorld-Verified, which measures computer environment operation capabilities.

The model demonstrates improved performance in scientific research applications, achieving 25.0% on GeneBench compared to GPT‑5.4's 19.0%, and 80.5% on BixBench for bioinformatics analysis.

OpenAI has implemented what it calls enhanced cybersecurity safeguards for GPT‑5.5, rating the model's biological and cybersecurity capabilities as "High" under its Preparedness Framework. The company is offering specialized access through its "Trusted Access for Cyber" program for verified security professionals.

API pricing for GPT‑5.5 will be $5 per million input tokens and $30 per million output tokens, with a 1-million token context window. A higher-performance version, GPT‑5.5 Pro, will cost $30 per million input tokens and $180 per million output tokens.

The model underwent safety evaluations including external testing and feedback from approximately 200 early-access partners before release, according to OpenAI's statement.