Released alongside Perplexity's pplx-embed-v2-context-9b-preview on September 30, 2026, context-bench holds 2,099 queries over 38,894 long documents (about 2.46 million sentence chunks) across 21 domains. Labels stay private to limit contamination; labs request evals at contextbench@turbopuffer.com. Metrics include Document@K, Answer@K, and Evidence Recall@K. Figures quoted from Perplexity's post are vendor-submitted.