Grok 3 — reviews, specs & pricing

xAI's prior-generation flagship reasoning model.

Summary

Grok 3 introduced 'Think' mode for extended reasoning and DeepSearch for web-integrated answers, with a 131k context window. It was trained on xAI's Colossus supercomputer. It remains available via API alongside Grok 4.

Sample use case

Used for chat, reasoning tasks, and search-augmented queries within the X ecosystem. Also used in third-party apps via API.

Specifications

  • Provider: xai
  • License: closed
  • Context: 131k tokens
  • Input price: $3/M tok
  • Output price: $15/M tok
  • Released: 2025-02-19

Pros

  • Extended thinking mode
  • Search integration
  • Competitive benchmarks at launch

Cons

  • Superseded by Grok 4
  • Closed weights
  • Limited multimodal support vs peers

Average rating 0.0 from 0 community reviews on Reviuws.

Frequently asked questions

What is Grok 3?

Grok 3 introduced 'Think' mode for extended reasoning and DeepSearch for web-integrated answers, with a 131k context window. It was trained on xAI's Colossus supercomputer. It remains available via API alongside Grok 4.

How much does Grok 3 cost?

Grok 3 costs $3 per million input tokens and $15 per million output tokens.

Is Grok 3 open source?

Grok 3 is released under the closed license.