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    Grok 4.20 API pricing

    xAI model · xAI on AIWiseRank

    Short answer

    Grok 4.20 by xAI costs $1.25 per 1M input tokens and $2.50 per 1M output tokens, with a 1M token context window. It scores 72.2% on SWE-bench Verified and 65.1% on ARC-AGI-2. GLM-5.3 Flash scores about as well on SWE-bench Verified (92%) for $0.24 per 1M blended tokens versus $1.56.

    Prices updated Oct 23, 2026 (APIpulse, CC BY 4.0) · Benchmarks: ARC Prize, Vals.ai · all models

    Input$1.25 / 1M
    Output$2.50 / 1M
    Context1M
    Blended (3:1)$1.56 / 1M

    API cost calculator

    Enter your monthly usage in millions of tokens (1M tokens ≈ 750,000 words).

    Grok 4.20$17.50 / month$210 / year

    Standard rates; batch processing and prompt caching can lower the bill.

    Benchmarks

    ARC-AGI-2 (reasoning)65.1% (Reasoning)
    SWE-bench Verified (coding)72.2%

    Cheaper models with similar scores

    Within 3 points on the same benchmark, at a lower blended price.

    Other xAI models

    ModelInput / 1MOutput / 1M
    Grok 4.7$2$6
    Grok 4.6$2$6
    Grok 4.5$2$6
    Grok 4.3$1.25$2.50
    Grok 4.20 Multi-Agent$1.25$2.50
    Grok Build 0.1$1$2

    Frequently asked questions

    How much does the Grok 4.20 API cost?

    Grok 4.20 costs $1.25 per 1M input tokens and $2.50 per 1M output tokens. A workload of 10M input and 2M output tokens a month costs $17.50.

    What is the context window of Grok 4.20?

    Grok 4.20 supports a 1M token context window.

    Is there a cheaper alternative to Grok 4.20?

    GLM-5.3 Flash scores 92% on SWE-bench Verified, close to Grok 4.20, at $0.24 per 1M blended tokens versus $1.56.