DeepSeek V4.1 Flash vs Gemini 3.5 Flash: pricing and benchmarks
DeepSeek V4.1 Flash is 80% cheaper on input tokens ($0.30 vs $1.50 per 1M). DeepSeek V4.1 Flash is 87% cheaper on output tokens ($1.20 vs $9.00 per 1M). On our document Q&A workload (50,000 questions a month), DeepSeek V4.1 Flash costs $156.00 a month versus $870.00 for Gemini 3.5 Flash, 82% less. Epoch AI has not published a capability index score for DeepSeek V4.1 Flash yet.
Prices verified September 14, 2026.
Which should you choose?
Epoch AI has not published a capability index score for DeepSeek V4.1 Flash yet.
DeepSeek V4.1 Flash costs $0.525 per 1M tokens (3:1 input-to-output mix) vs $3.375 for Gemini 3.5 Flash, 84% less.
Pricing and specs
| DeepSeek V4.1 Flash | Gemini 3.5 Flash | |
|---|---|---|
| Provider | DeepSeek | |
| API model ID | deepseek-flash | gemini-3.5-flash |
| Input / 1M tokens | $0.30 | $1.50 |
| Cached input / 1M tokens | $0.006 | $0.15 |
| Output / 1M tokens | $1.20 | $9.00 |
| Long-context rates | — | — |
| Context window | 1M tokens | 1.05M tokens |
| Max output | 384K tokens | 66K tokens |
| Batch discount | — | 50% off |
Benchmarks
| DeepSeek V4.1 Flash | Gemini 3.5 Flash | |
|---|---|---|
| Epoch Capabilities Index | — | 154.7 |
| GPQA Diamond· Science reasoning | — | 90.4% |
| FrontierMath (Tiers 1–3)· Advanced math | — | 62.8% |
| SimpleQA Verified· Factual accuracy | — | 66.2% |
| ARC-AGI-2· Abstract reasoning | — | 72.1% |
| DeepSWE· Coding | — | 37.4% |
| APEX-Agents· Agentic work | — | — |
Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks
Monthly cost for real workloads
| Workload | DeepSeek V4.1 Flash | Gemini 3.5 Flash | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $93.00 | $585.00 | DeepSeek V4.1 Flash 84% cheaper |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $156.00 | $870.00 | DeepSeek V4.1 Flash 82% cheaper |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $61.68 | $402.00 | DeepSeek V4.1 Flash 85% cheaper |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
DeepSeek V4.1 Flash vs Gemini 3.5 Flash cost calculator
- $156.00/mo$0.0031 / request
- Gemini 3.5 FlashGoogle$870.00/mo$0.02 / request
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
DeepSeek V4.1 Flash pricing notes
DeepSeek’s low-cost model with thinking and non-thinking modes, tool calls and vision input.
- Prices shown are peak rates. Off-peak rates are half: peak hours are 01:00–04:00 and 06:00–10:00 UTC, Monday to Friday.
- Compatible with both OpenAI-format and Anthropic-format APIs.
Gemini 3.5 Flash pricing notes
Google’s Gemini 3.5 Flash model, with thinking, tool use and a 1M-token context window.
- Output price includes thinking tokens.
- Context cache storage costs $1.00 per 1M tokens per hour.
- Priority inference costs 1.8x the standard rate.
Frequently asked questions
- Is DeepSeek V4.1 Flash cheaper than Gemini 3.5 Flash?
- DeepSeek V4.1 Flash is 80% cheaper on input tokens ($0.30 vs $1.50 per 1M). DeepSeek V4.1 Flash is 87% cheaper on output tokens ($1.20 vs $9.00 per 1M). On our document Q&A workload (50,000 questions a month), DeepSeek V4.1 Flash costs $156.00 a month versus $870.00 for Gemini 3.5 Flash, 82% less.
- Which is more capable, DeepSeek V4.1 Flash or Gemini 3.5 Flash?
- Epoch AI has not published a capability index score for DeepSeek V4.1 Flash yet.
- How much does DeepSeek V4.1 Flash cost per 1M tokens?
- DeepSeek V4.1 Flash costs $0.30 per 1M input tokens and $1.20 per 1M output tokens, and $0.006 per 1M cached input tokens on DeepSeek’s standard tier.
- How much does Gemini 3.5 Flash cost per 1M tokens?
- Gemini 3.5 Flash costs $1.50 per 1M input tokens and $9.00 per 1M output tokens, and $0.15 per 1M cached input tokens on Google’s standard tier.
- Which has the larger context window, DeepSeek V4.1 Flash or Gemini 3.5 Flash?
- Gemini 3.5 Flash has the larger context window: 1.05M tokens versus 1M for DeepSeek V4.1 Flash.