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Deployment reach

Grok 4 Fast brings frontier search reasoning to free users

SpaceXAI released Grok 4 Fast to all Grok users and through low-cost APIs. The unified reasoning model combines a two-million-token context window with native web, X, and code-tool use, while its model card reports agent-abuse, prompt-injection, deception, and dual-use evaluations.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM58confidence 87/100

Why it moved the index

Free consumer access and inexpensive API access materially diffuse a near-frontier reasoning and search model with native tool use. The primary launch and model card establish access and safeguards, but most capability comparisons are developer-reported benchmarks, so confidence is below independently replicated evidence.

Assessment history

  1. R1
    Toward 58 · confidence 87

    New dated primary-source release and model-card evidence absent from the durable catalogue.

    14 Aug 2026

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DoomBench social sharing card for Grok 4 Fast brings frontier search reasoning to free users.

  1. DoomBench assesses “Grok 4 Fast brings frontier search reasoning to free users” as evidence moving toward doom, with magnitude 58 and confidence 87 out of 100 in the deployment reach category.

  2. The DoomBench assessment of “Grok 4 Fast brings frontier search reasoning to free users” is based on reporting from SpaceXAI and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Grok 4 Fast brings frontier search reasoning to free users” as follows: SpaceXAI released Grok 4 Fast to all Grok users and through low-cost APIs. The unified reasoning model combines a two-million-token context...

    https://www.doombench.com/news/grok-4-fast-brings-frontier-search-reasoning-to-free-users-2025-09-19