TL;DR: As overwhelming demand for Anthropic's Opus 4.6 led to degraded performance and tighter rate limits, developers are migrating back to OpenAI for GPT-5.5—and unlike past cycles, OpenAI is positioned to absorb the surge with new compute supply lined up & now, the ability to provide its models through AWS and Google Cloud. Sacra estimates OpenAI hit $25B in annualized revenue in February 2026, up from $20B at the end of 2025. For more, check out our full report and dataset on OpenAI...