ChatGPT UTM Bug Sent Referral Traffic to Direct During the GPT-6 Rollout

Description and use

<p>A temporary change in how ChatGPT handled outbound links distorted a key marketing metric during the <a href="https://scalevise.com/resources/gpt-6-pro-chatgpt-upgrade-faster-agent-workflows/" rel="noopener noreferrer">GPT-6 rollout</a> in October 2026. UTM parameters identifying ChatGPT as the source disappeared from some links, while browser settings on some opened links also suppressed referrer information. The result was not necessarily a decline in ChatGPT-driven visits. Instead, analytics platforms such as Google Analytics 4 could classify those sessions as <strong>Direct</strong> or

Problem

<p>A temporary change in how ChatGPT handled outbound links distorted a key marketing metric during the <a href="https://scalevise.com/resources/gpt-6-pro-chatgpt-upgrade-faster-agent-workflows/" rel="noopener noreferrer">GPT-6 rollout</a> in October 2026. UTM parameters identifying ChatGPT as the source disappeared from some links, while browser settings on some opened links also suppressed referrer information. The result was not necessarily a decline in ChatGPT-driven visits. Instead, analytics platforms such as Google Analytics 4 could classify those sessions as <strong>Direct</strong> or

Outcome

<p>A temporary change in how ChatGPT handled outbound links distorted a key marketing metric during the <a href="https://scalevise.com/resources/gpt-6-pro-chatgpt-upgrade-faster-agent-workflows/" rel="noopener noreferrer">GPT-6 rollout</a> in October 2026. UTM parameters identifying ChatGPT as the source disappeared from some links, while browser settings on some opened links also suppressed referrer information. The result was not necessarily a decline in ChatGPT-driven visits. Instead, analytics platforms such as Google Analytics 4 could classify those sessions as <strong>Direct</strong> or

Evidence

ChatGPT UTM Bug Sent Referral Traffic to Direct During the GPT-6 Rollout

Source