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xAI releases Grok 4 and multi-agent Grok 4 Heavy

xAI released Grok 4 with native tool use and real-time search, plus Grok 4 Heavy, which runs multiple reasoning agents in parallel. Access included subscriptions and the Grok 4 API.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM72confidence 90/100

Why it moved the index

The release combined frontier reasoning, native tools, live information access and a parallel multi-agent tier, materially advancing consequential capability and autonomous problem solving.

Assessment history

  1. R1
    Toward 72 · confidence 90

    New exact July 2025 model release verified against xAI's official product page and an exact contemporaneous publication clock.

    12 Aug 2026

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  1. DoomBench assesses “xAI releases Grok 4 and multi-agent Grok 4 Heavy” as evidence moving toward doom, with magnitude 72 and confidence 90 out of 100 in the capability gains category.

  2. The DoomBench assessment of “xAI releases Grok 4 and multi-agent Grok 4 Heavy” is based on reporting from TechCrunch and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “xAI releases Grok 4 and multi-agent Grok 4 Heavy” as follows: xAI released Grok 4 with native tool use and real-time search, plus Grok 4 Heavy, which runs multiple reasoning agents in parallel. Access included...

    https://www.doombench.com/news/xai-releases-grok-4-and-multi-agent-grok-4-heavy-2025-07-10