Gemini 3.8 Flash API pricing — what it really costs
Gemini 3.8 Flash (Google) costs $0.750 per 1M input tokens and $3.75 per 1M output tokens — with prompt caching, cached input drops to $0.075. Launch price until Dec 31, 2026; $1.50/$7.50 announced from Jan 1, 2027. Prices verified 2026-10-17; we track the price you are actually billed today, including promotional rates.
Price per 1M tokens
| Input | Output | Cached input |
|---|---|---|
| $0.750 | $3.75 | $0.075 |
Real monthly costs on Gemini 3.8 Flash
Three realistic workloads, computed from the prices above (cached share billed at the cache-read rate where the provider offers one):
Customer-support chatbot
$2.56/mo
2M input + 0.5M output tokens/month, 60% of input served from prompt cache
RAG / document Q&A
$9.30/mo
20M input + 1M output tokens/month, 70% cached (shared context)
Agentic coding assistant
$29.25/mo
50M input + 5M output tokens/month, 80% cached (long sessions)
Want exact numbers for your usage? Open the calculator — same verified prices, your token volumes.
Compare Gemini 3.8 Flash
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- Gemini 3.8 Flash vs Gemini 3.1 Pro — which is cheaper?
- Gemini 3.8 Flash vs Gemini 3.1 Flash-Lite — which is cheaper?
FAQ
How much does the Gemini 3.8 Flash API cost?
Gemini 3.8 Flash costs $0.750 per 1M input tokens and $3.75 per 1M output tokens. Cached input tokens cost $0.075 per 1M. Note: Launch price until Dec 31, 2026; $1.50/$7.50 announced from Jan 1, 2027. Pricing verified 2026-10-17.
What does a typical workload cost on Gemini 3.8 Flash?
Customer-support chatbot: about $2.56/month (2M input + 0.5M output tokens/month, 60% of input served from prompt cache). RAG / document Q&A: about $9.30/month (20M input + 1M output tokens/month, 70% cached (shared context)). Agentic coding assistant: about $29.25/month (50M input + 5M output tokens/month, 80% cached (long sessions))
Is Gemini 3.8 Flash expensive compared to other models?
Gemini 3.8 Flash ranks #6 of 23 models by blended price in our comparison. The cheapest tracked models are Claude Haiku 5.5 and GPT-6 Luna at $0.100/$0.500 per 1M tokens.