Venice AI
OpenRouter's listing names the exact "Grok 4.20 Multi-Agent" variant and attributes it to SpaceXAI/xAI with a March 31, 2026 release and 2.0M context window. The page documents agent-count scaling tied to reasoning effort: low/medium reasoning runs 4 agents, while high/xhigh scales to 16 agents for more thorough collab Live provider telemetry from OpenRouter shows SpaceXAI (non-ZDR) delivering P50 latency of 4.36 seconds and throughput of 379 tokens per second, with 87.92% uptime — useful independent performance data for the variant. Weighted-average effective prices customers actually pay are reported at $0.5824 input and $2.357 out