Pangram has released Pangram 4, an AI text detector claiming 99.66% accuracy with just one false positive per 24,000 documents. The model also resists tools designed to mask AI-generated text as human writing.
The detector represents a significant improvement in identifying machine-generated content, addressing growing concerns about AI-written material in academic and professional settings.
Pangram 4 reportedly withstands "humanizer" tools—software that modifies AI output to evade detection—a key challenge for earlier detection systems. The company has not detailed the technical improvements enabling this resistance.
The update comes with pricing changes. API costs are increasing by a factor of two to ten, depending on the service tier. The company has not specified exact pricing or provided details on existing customers' transition plans.
Accuracy metrics for AI detection tools remain contested territory. Independent testing of similar systems has sometimes revealed lower real-world performance than vendor claims, particularly across different writing styles and document types.
Pangram 4 is available now, though the company has not announced a free tier option or detailed availability for individual users versus enterprise customers.
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