Best LLMs with 1M+ context in 2026: GPT-5.5 leads, Gemini falters Six models now claim 1M token contexts. MRCR v2 shows GPT-5.5 at 74% recall at 1M tokens; Gemini 3.5 Flash drops to 26%. Ranked by what they actually use. Jun 22, 2026 · 6 min read nichecontext-windowcost