When should I choose Gemini 3.5 Flash over DeepSeek V4 Flash?

Choose Gemini 3.5 Flash if you need Google Cloud ecosystem integration (Vertex AI, BigQuery), prefer a US-based provider with enterprise SLAs and compliance certifications, or need Google's multimodal capabilities. Gemini also offers a generous free tier.

Gemini 3.5 Flash vs DeepSeek V4 Flash — Cheapest AI API Comparison 2026

Requests per Day

Days per Month

Google

Gemini 3.5 Flash

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

DeepSeek

DeepSeek V4 Flash

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Other Models to Consider

DeepSeek V4 Pro

DeepSeek

$0.435 / $0.87 per 1M

1M context

Gemini 2.5 Flash-Lite

Google

$0.075 / $0.30 per 1M

1M context

GPT-oss 120B

OpenAI

$0.15 / $0.60 per 1M

128K context

Which Model for Which Use Case?

Cost-Sensitive Chatbots

DeepSeek V4 Flash's 97% cheaper output pricing makes it the clear winner for chatbots where every fraction of a cent counts.

Better value: DeepSeek V4 Flash

Google Cloud Integration

If you're on Google Cloud Platform, Gemini 3.5 Flash integrates natively with Vertex AI, BigQuery ML, and Cloud Functions — worth the premium if you're already in the ecosystem.

Better integration: Gemini 3.5 Flash

High-Volume Classification

For thousands of daily classification requests, DeepSeek V4 Flash's $0.14/M input crushes Gemini 3.5 Flash's $1.50/M — 91% savings on input alone.

Better value: DeepSeek V4 Flash

Enterprise Compliance

Google Cloud offers SOC 2, HIPAA BAA, and enterprise SLAs. For regulated industries, Gemini's compliance certifications may be worth the price premium.

Better compliance: Gemini 3.5 Flash

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Frequently Asked Questions

Is DeepSeek V4 Flash cheaper than Gemini 3.5 Flash?

Yes. DeepSeek V4 Flash costs $0.14/M input and $0.28/M output. Gemini 3.5 Flash costs $1.50/M input and $9.00/M output. DeepSeek V4 Flash is 91% cheaper on input and 97% cheaper on output — while both offer 1M context windows.

How much can I save with DeepSeek V4 Flash?

For a typical workload of 1M input + 500K output tokens/month: Gemini 3.5 Flash costs $6.00 vs DeepSeek V4 Flash at $0.28 — saving $5.72/month (95%). At 10M input + 5M output, you save $57.20/month.

When should I choose Gemini 3.5 Flash?

Choose Gemini 3.5 Flash if you need Google Cloud integration, enterprise SLAs and compliance certifications, or prefer a US-based provider. Gemini also has a generous free tier for low-volume use.