SpaceXAI: Grok 4.20 Multi-Agent

Within the crowded field of reasoning assistants, this variant stakes out the multi-agent corner: multiple agents run in parallel to conduct deep research, coordinate tool use and synthesise findings into one answer. Its headline spec is a 2,000,000-token context window, larger than most models listed here, paired with chain-of-thought reasoning, vision for image input and structured JSON output. A fitting use case is a market analyst dropping a vast document set plus charts into a single prompt and asking the parallel agents to research, cross-reference and return a structured, parseable summary. Unlike Claude Sonnet 5 or Gemini, which are general-purpose commercial assistants, this is tuned specifically for collaborative, agent-based synthesis at very large context. Two limits matter: there is no free tier, with usage billed at $1.25 per 1M tokens, and despite the agent framing it lists no tool or function calling support, which constrains how it hooks into external systems directly. Its knowledge cutoff is September 2025, among the most current here. Ideal for researchers and analysts who need parallel, large-context reasoning over mixed text and images with reliable JSON output. Choose it for deep multi-agent research at scale; skip it if you need direct function calling or a free tier.