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    Gemini 3.8 Flash vs Grok 4.3

    Short answer

    Gemini 3.8 Flash costs 4% less than Grok 4.3 for a typical 3:1 input-to-output token mix ($1.50 vs $1.56 per 1M tokens). Gemini 3.8 Flash scores higher on SWE-bench Verified (80% vs 71.4%).

    Prices updated Nov 13, 2026 (APIpulse, CC BY 4.0) · Benchmarks: ARC Prize, Vals.ai · all models

    Gemini 3.8 FlashcheaperGrok 4.3
    ProviderGooglexAI
    Input / 1M tokens$0.75$1.25
    Output / 1M tokens$3.75$2.50
    Blended (3:1) / 1M$1.50$1.56
    Context window1M1M
    ARC-AGI-289.2% (High)—
    SWE-bench Verified80%71.4%

    API cost calculator

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

    Gemini 3.8 Flashcheapest$15 / month$180 / year
    Grok 4.3$17.50 / month$210 / year

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

    Frequently asked questions

    Which is cheaper, Gemini 3.8 Flash or Grok 4.3?

    Gemini 3.8 Flash costs 4% less than Grok 4.3 for a typical 3:1 input-to-output token mix ($1.50 vs $1.56 per 1M tokens).

    How much do Gemini 3.8 Flash and Grok 4.3 cost per month?

    For 10M input and 2M output tokens a month: Gemini 3.8 Flash costs $15 and Grok 4.3 costs $17.50.

    More: Gemini 3.8 Flash pricing · Grok 4.3 pricing · all API prices

    Benchmarks updated Nov 15, 2026.