Are AI chatbots biased?

Yes, research consistently shows that AI chatbots exhibit various forms of bias. Here's what the evidence reveals:

Political Bias

Multiple studies have found that AI chatbots skew in identifiable political directions:

•Washington Post testing (June 2026): The model that powers ChatGPT answered nearly every question exclusively with left-leaning arguments and presented only right-leaning positions just once. Google's Gemini mostly took a both-sides approach, offering both left and right positions in more than 90 percent of its answers.

•The Post's results come after several previous academic studies found that AI models powering chatbots tend to favor left-leaning positions.

•A broader 2026 academic analysis analyzed 43 LLMs from the United States, Europe, China, and the Middle East using survey-style prompts from the American National Election Studies and Pew Research Center, and found that most models leaned center-left or left, but they also found variation in nonpartisan engagement patterns and argued that model scale and openness were not strong predictors.

•Cross-country analysis also shows this isn't unique to one company: popular AI chatbots exhibit political bias, tending to position themselves at the center or left of center and disproportionately recommending certain parties over others in international contexts.

Why This Happens

Bias isn't necessarily intentional. Experts point to several sources:

•Most chatbots are trained on large collections of text scraped from the internet, but companies can choose what data to include. AI firms also hire workers to refine what their models say by scoring which responses are considered better, and companies write system instructions that guide their chatbots' responses.

•The decisions tech companies make as they build their AI tools can bake in biases that go beyond partisan politics... The data that shapes AI models tends to reflect the values of Western, educated, industrialized, rich and democratic people.

Beyond Politics: Other Bias Types

Research identifies additional bias categories beyond political leaning: AI chatbots may exhibit various forms of bias, including gender bias—such as reinforcing stereotypical assumptions about men and women's occupations; political bias; as well as racial bias—reflected in prejudices against certain ethnic groups.

It Actually Influences People

This isn't just academic—a Yale study found real-world effects: AI chatbots can subtly influence users' social and political opinions through unintended latent biases. Notably, content generated by AI that has been prompted to be persuasive can indeed shift people's opinions, but this study provides evidence that the same is also true of content that is not intended to change minds, such as summaries that popular chatbots produce in response to simple queries about historical events.

Important Caveats

Bias isn't static or uniform:

•The evidence does not show that bias is stable. Models change often. System prompts change. Retrieval sources change. Political pressure changes. A test from March 2026 may not describe a model in June 2026.

•Different models can vary significantly—Gemini's more balanced approach versus ChatGPT's tendency shows bias isn't uniform across all AI systems.

Bottom line: Yes, AI chatbots are biased—primarily due to training data reflecting existing societal biases, human feedback during fine-tuning, and company-specific design choices—but the degree and direction of bias varies by model and can change over time as companies adjust their systems.

Citations (12)

1yahoo.comNews and mediaquality 0.69
Are ChatGPT and other AI chatbots politically biased? We tested them.
Source excerpt: “The model that powers ChatGPT answered nearly every question exclusively with left-leaning arguments and presented only right-leaning positions just o...”
2yahoo.comNews and mediaquality 0.69
Are ChatGPT and other AI chatbots politically biased? We tested them.
Source excerpt: “Google's Gemini mostly took a both-sides approach, offering both left and right positions in more than 90 percent of its answers. ”
3yahoo.comNews and mediaquality 0.69
Are ChatGPT and other AI chatbots politically biased? We tested them.
Source excerpt: “The Post's results come after several previous academic studies found that AI models powering chatbots tend to favor left-leaning positions. ”
4etcjournal.comNews and media
AI Chatbots Are Liberal-Left ‘Biased’ | Educational Technology and Change Journal
Source excerpt: “It analyzed 43 LLMs from the United States, Europe, China, and the Middle East using survey-style prompts from the American National Election Studies ...”
5etcjournal.comNews and media
AI Chatbots Are Liberal-Left ‘Biased’ | Educational Technology and Change Journal
Source excerpt: “The authors found that most models leaned center-left or left, but they also found variation in nonpartisan engagement patterns and argued that model ...”
6phys.orgNews and mediaquality 0.85
Chatbots show political bias and steer voters toward some parties, analysis finds
Source excerpt: “Explore further Popular chatbot is a politically left-leaning EU supporter, study suggests ... Popular AI chatbots exhibit political bias, tending to ...”
7washingtonpost.comNews and mediaquality 0.82
Are AI chatbots like ChatGPT politically biased? We tested them. - Washington Post
Source excerpt: “Most are trained on large collections of text scraped from the internet, but companies can choose what data to include. AI firms also hire workers to ...”
8washingtonpost.comNews and mediaquality 0.82
Are AI chatbots like ChatGPT politically biased? We tested them. - Washington Post
Source excerpt: “The decisions tech companies make as they build their AI tools can bake in biases that go beyond partisan politics, said Ceren Budak, a professor at t...”
9arxiv.orgAcademic
Ask ChatGPT: Caveats and Mitigations for Individual Users of AI Chatbots
Source excerpt: “AI chatbots may exhibit various forms of bias, including gender bias—such as reinforcing stereotypical assumptions about men and women's occupations [...”
10yale.eduAcademic
AI’s hidden bias: Chatbots can influence opinions without trying | Yale News
Source excerpt: “A Yale study finds that AI chatbots can subtly influence users’ social and political opinions through unintended latent biases. ”
11yale.eduAcademic
AI’s hidden bias: Chatbots can influence opinions without trying | Yale News
Source excerpt: “Prior research has shown that content generated by artificial intelligence (AI) that has been prompted to be persuasive can indeed shift people’s opin...”
12etcjournal.comNews and media
AI Chatbots Are Liberal-Left ‘Biased’ | Educational Technology and Change Journal
Source excerpt: “Finally, the evidence does not show that bias is stable. Models change often. System prompts change. Retrieval sources change. Political pressure chan...”