xAI Introduces Grok 4.20 Multi-Agent Beta

ArticlexAIAnnouncement

xAI has launched the Grok 4.20 Multi-Agent Beta model, designed for deep research tasks via multiple collaborating agents working in parallel.

Key points

  1. Features a 1,000,000-token context window with text and image-to-text input modalities.
  2. Supports native reasoning, function calling, and structured outputs.
  3. Tiered pricing: $1.25 per 1M input tokens and $2.50 per 1M output tokens for prompts under 200k tokens, doubling for prompts of 200k tokens or more.
  4. The Batch API is supported and provides a 20% discount on standard rates.
  5. Available in us-east-1 and us-west-2 regions with limits of 9 requests per second and 2.5 million tokens per minute.

Why it matters

The multi-agent setup provides an API-level mechanism to parallelise complex research and reasoning workloads across huge document contexts, streamlining pipelines that previously required custom orchestration frameworks.

Analysis

The tiered pricing model penalises large requests heavily: once a prompt reaches 200k tokens, the entire request is billed at double the standard rate. Teams using the 1M token context will need strict token monitoring to manage costs effectively.

Mentioned links

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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