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Grok 3

xAI's first frontier-tier release, established the company's Colossus-trained model line.

Updated

Quick facts

Released
Feb 2025
Context
128K tokens
Output / 1M
$15.00 / 1M tokens
License
Proprietary

About Grok 3

Grok 3 was xAI's first model trained on the Colossus supercluster and the release that put xAI in serious competition for the frontier. It introduced the company's reasoning-mode and Big Brain features.

Benchmarks

Published scores from xAI's model card or independent leaderboards. We do not publish numbers we cannot source, see methodology.

HumanEval
,
Python coding pass@1
MMLU
,
Broad academic knowledge
GPQA
,
Graduate-level reasoning
SWE-bench
,
Real software-engineering tasks
Benchmark scores not yet available. We only publish numbers we can source from official model cards or independent leaderboards, see methodology.

Capabilities

Strengths

  • Real-time X access
  • Reasoning modes

Tracked weaknesses

  • Superseded by Grok 4

Pricing

Per-million-token rates as published by xAI.

TierPriceNotes
Input$3.00 / 1M tokensTokens you send to the model
Output$15.00 / 1M tokensTokens the model generates
Context128K tokensMax combined input + output

Call Grok 3 from your code

Drop-in snippet for the xAI SDK. Set your API key in the environment and run.

typescript
import OpenAI from "openai";

const client = new OpenAI({
  // Use OPENAI_API_KEY for OpenAI, or your provider's key + baseURL.
  apiKey: process.env.OPENAI_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "grok-3",
  messages: [
    { role: "user", content: "What's the time complexity of quicksort?" },
  ],
});

console.log(completion.choices[0].message.content);

Compare Grok 3 with…

Frequently asked

  • How much does Grok 3 cost per million tokens?
    Grok 3 is priced at $3.00 / 1M tokens for input tokens and $15.00 / 1M tokens for output tokens via the official xAI API at the time of writing.
  • What is Grok 3's context window?
    Grok 3 supports a context window of 128K tokens.
  • Is Grok 3 open source?
    No. Grok 3 is a closed-weight model, you can use it via xAI's API but the model weights are not publicly downloadable.
  • When was Grok 3 released?
    Grok 3 was released on Feb 17, 2025 by xAI.
  • What is Grok 3's knowledge cutoff?
    Grok 3's training data has a knowledge cutoff of Aug 2024. For information after that date you'll need a tool-use or web-search wrapper.
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