Price comparison · checked October 12, 2026

Gemini 3.8 Flash vs Grok 4.3 pricing

For a typical support chatbot (60,000 conversations a month), Gemini 3.8 Flash costs $135 a month and Grok 4.3 costs $158. That makes Gemini 3.8 Flash 1.2× cheaper for this workload.

Gemini 3.8 FlashGrok 4.3
ProviderGooglexAI
Input / 1M$0.75$1.25
Cached input / 1M–$0.20
Output / 1M$3.75$2.50
Context window1M1M
NotesRises to $1.50 / $7.50 on Jan 1, 2027Higher rate for prompts of 200K+

Monthly cost by workload

WorkloadGemini 3.8 FlashGrok 4.3Difference
Support chatbot
60,000 req · 1,500 in / 300 out
$135$158Gemini 3.8 Flash 1.2× cheaper
Document summaries
20,000 req · 6,000 in / 400 out
$120$170Gemini 3.8 Flash 1.4× cheaper
Coding assistant
30,000 req · 4,000 in / 800 out
$180$210Gemini 3.8 Flash 1.2× cheaper
RAG search
100,000 req · 2,500 in / 250 out
$281$375Gemini 3.8 Flash 1.3× cheaper

Standard rates, no caching or batch discounts. Sources: ai.google.dev · docs.x.ai

Try your own numbers

Start from a use case

1,000 tokens is about 750 English words. Input includes your system prompt, chat history and any retrieved documents.

Gemini 3.8 Flash
GoogleCheapest
$135 /mo
Grok 4.3
xAI
$158 /mo

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