OpenAI's Strategic Shift to Weekly Active Users: Implications for ChatGPT’s Growth and Unit Economics

OpenAI’s recent decision to report Weekly Active Users (WAU) instead of the more common Monthly Active Users (MAU) has raised eyebrows in the tech and finance communities. This strategic move is significant, as it positions ChatGPT's user base growth in a unique light, making direct comparisons with other large consumer technology products challenging. Here’s a closer look at why this matters, the key risks involved, and the potential opportunities for OpenAI.

Why It Matters

OpenAI’s choice to report WAU is notable because it diverges from industry norms. The most recent comparable example of reporting WAU is the iOS App Store, which disclosed 813 million "weekly active visitors" in a June 2025 whitepaper. This number closely aligns with OpenAI's announcement at its Developer Day in October, where ChatGPT reported 800 million WAUs. By December, The Information reported that ChatGPT had nearly 900 million weekly active users, marking a 12% growth over two months.

Key Risks

1. Incomparability: Reporting WAU makes it difficult to compare ChatGPT's user base with other major consumer tech products, which typically report MAU. This strategic opacity can make it challenging for investors and analysts to assess the true scale and growth of OpenAI’s platform.

2. Low User Retention: As discussed in my previous analysis on ChatGPT’s unit economics, low user retention is a significant concern. Users may cycle in and out of the product over a month, inflating MAU relative to WAU. This means that using MAU would reveal weaker unit economics when revenue metrics are considered.

3. Saturation Masking: Reporting WAU can mask saturation issues. Products with high churn rates might show monotonically increasing WAU figures, even if the underlying user base is not growing sustainably. Understanding cohort retention and compounding is crucial for accurate growth analysis.

The Opportunity

1. Strategic Positioning: By reporting WAU, OpenAI positions ChatGPT as a uniquely active platform. This can be particularly appealing to investors who prioritize high engagement metrics over sheer scale.

2. Revenue Metrics: OpenAI has already disclosed that ChatGPT generates $20 billion in Annual Recurring Revenue (ARR). Using the smaller WAU base for revenue calculations presents stronger unit economics, which can be more attractive to stakeholders.

3. Market Differentiation: The use of WAU differentiates ChatGPT from other consumer tech products, potentially highlighting its unique value proposition and user engagement. This strategic differentiation can help OpenAI stand out in a crowded market.

Conclusion

OpenAI’s decision to report Weekly Active Users for ChatGPT is a strategic move that has both risks and opportunities. While it makes direct comparisons with other platforms challenging, it also positions ChatGPT as a highly active and engaged user base. Understanding the implications of this metric choice is crucial for investors and analysts assessing OpenAI's growth trajectory and financial health.