OpenAI's GPT-5.5 Achieves 95% Safety Benchmark Pass Rate, Cuts Hallucinations 40%, Adds 1M-Token Context
OpenAI published the GPT-5.5 System Card, a technical document outlining the model's safety evaluations, capabilities, and limitations. The card reveals GPT-5.5 achieves a 95% pass rate on internal adversarial safety benchmarks and reduces hallucination rates by 40% compared to GPT-4. It also details new multimodal reasoning improvements and a 1-million-token context window. The release signals OpenAI's commitment to transparency ahead of broader deployment.