Most dependable frontier provider to build on right now

Which frontier AI provider is the most dependable to build on right now, and which is the riskiest? Ranks the providers TensorFeed actively probes by measured operational reliability, fusing availability and tail consistency (p50 over p95) from its own latency probes into one dependability score, names the most dependable and the riskiest, and returns the full per-provider ranking with an AFTA-signed receipt. 30-minute freshness SLA, no-charge when stale.