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Gemini 3.5 Flash vs DeepSeek V4 Pro
Google's mid-tier speed demon vs DeepSeek's budget powerhouse. DeepSeek is 71% cheaper on input with the same 1M context — can budget beat Google's ecosystem?
Pricing data verified: Jun 29, 2026
| Specification | Gemini 3.5 Flash (Google) | DeepSeek V4 Pro |
|---|---|---|
| Input Price (per 1M tokens) | $1.50 | $0.435 |
| Output Price (per 1M tokens) | $9.00 | $0.87 |
| Context Window | 1M tokens | 1M tokens |
| Tier | Mid-Tier | Budget |
| Provider | DeepSeek |
Calculate Your Exact Costs
Same context window, 71-90% price gap — see the real savings for your workload.
Which Model for Which Use Case?
High-Volume Processing
Thousands of daily API calls. DeepSeek V4 Pro's 71-90% cheaper pricing makes it the clear winner for cost-sensitive, high-volume workloads.
Google Cloud Integration
Vertex AI, BigQuery ML, Firebase. If your stack is already on GCP, Gemini 3.5 Flash integrates natively with Google's ecosystem — reducing operational complexity.
Multimodal Tasks
Image understanding, video analysis, mixed content. Gemini 3.5 Flash has proven multimodal capabilities — DeepSeek's multimodal support is newer and less battle-tested.
Long Document Analysis
Both have 1M context windows. DeepSeek V4 Pro at 71% cheaper input makes it the better value for processing long documents, research papers, or large codebases.
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Frequently Asked Questions
How much cheaper is DeepSeek V4 Pro than Gemini 3.5 Flash?
DeepSeek V4 Pro costs $0.435/$0.87 per 1M tokens. Gemini 3.5 Flash costs $1.50/$9.00 per 1M tokens. DeepSeek is 71% cheaper on input and 90% cheaper on output — an 86% overall savings for most workloads.
Which has a larger context window?
Both models have a 1M token context window. This is a tie — both are excellent for long-context workloads like document processing and large codebases.
When should I choose Gemini 3.5 Flash over DeepSeek V4 Pro?
Choose Gemini 3.5 Flash when you need Google's ecosystem integration (Vertex AI, BigQuery, Google Cloud), proven multimodal capabilities, or the reliability of a Google-backed service. Choose DeepSeek V4 Pro when cost is your primary concern.
Is DeepSeek V4 Pro as reliable as Gemini 3.5 Flash?
Google's infrastructure provides enterprise-grade reliability with SLAs. DeepSeek is a newer entrant with competitive quality but less proven uptime track record. For mission-critical production, Google's reliability may justify the premium.
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