AI chatbots show left-wing bias, Washington Post report finds, with ChatGPT giving left-leaning answers 80% of time

The test used a structured set of political questions from a Dartmouth and Stanford research study.

The test asked each model about roughly 30 policy issues, including taxes, health care, immigration, guns, affirmative action, and the death penalty.

GPT-5.5 gave only the left-leaning position in 80% of answers, both sides in 17%, and only the right-leaning position in 3%.

Gemini 3.1 Pro looked very different, giving both sides in 93% of answers and left-only answers in 7%.

Claude Opus 4.8 gave both sides in 57%, while Grok 4.3 was the only model with a large right-only share at 33%.

The deeper point is not whether one answer sounds liberal or conservative, but whether a model compresses a political dispute into one moral frame before the user sees the tradeoff.

This test suggests chatbot behavior is shaped less by raw facts than by ranking choices, refusal rules, training feedback, and default answer style.