Google Gemini 1.5 Pro Review — The 1-Million-Token Context That Changed Everything

Gemini 1.5 Pro launched February 15, 2024 with a 1-million-token context window — 5–8× larger than any competitor at the time. Built on sparse Mixture-of-Experts architecture and reaching 99.7%+ recall in needle-in-haystack tests at full context, it defined the 'long context era' of 2024 before Gemini 2.0 and 2.5 superseded it.