GPT-5.5-Pro did worse in BullshitBench (twitter.com)

In a recent evaluation, the newly released GPT-5.5-Pro performed notably worse on the BullshitBench benchmark compared to its predecessor, GPT-5. This benchmark assesses a model’s ability to generate coherent and relevant language, and the disappointing results have raised eyebrows within the AI and machine learning community. Analysts emphasize that despite expectations for performance improvements, the new model’s shortcomings suggest potential issues in the fine-tuning process or underlying architecture adjustments. The implications of this finding are significant, as it challenges the perception that incremental updates to GPT will inherently lead to better performance. Researchers and developers may need to reassess their approaches to model development and evaluation to ensure that enhancements do not compromise the quality of output. The performance decline in a critical benchmark prompts further exploration into model training methods, data quality, and testing procedures, signaling a crucial moment for reliability assessments in AI advancements.