Compare / DeepSeek V3 vs Gemini 3.5 Flash
DeepSeek V3 vs Gemini 3.5 Flash
Which is cheaper, which is more capable, and which does better at each kind of work, from 21 results on 3 sources that measured both models.
DeepSeek V3 or Gemini 3.5 Flash? The short answer
- DeepSeek V3 is cheaper: $0.45 against $3.38 per million tokens, 7.5 times less.
- Gemini 3.5 Flash scores higher on the Artificial Analysis Intelligence Index: 33.6 against 8.5.
- On our business benchmarks, Gemini 3.5 Flash ranks higher for agents and tool use, reasoning and knowledge, writing and sticking to the facts.
At a glance
| DeepSeek V3 | Gemini 3.5 Flash | |
|---|---|---|
| Price per million tokens | $0.26 in · $1.03 out | $1.50 in · $9.00 out |
| Blended (3 in : 1 out) | $0.45 | $3.38 |
| Cheapest host, blended | $0.45 (StreamLake) | $1.69 (Google) |
| Intelligence Index | 8.5 | 33.6 |
| Spring Prompt overall | – | – |
| Output speed, tokens a second | – | – |
| Context window | 163,840 tokens | 1,048,576 tokens |
| Weights | Open | Closed |
| Developer based in | China | the US |
Prices are the developer's list price where we have read it, otherwise the typical host on OpenRouter; see every model's price. Intelligence and speed from Artificial Analysis.
Which is better for what
Each model's rank among models available today, for each kind of work, from our own benchmarks and licensed sources. The better rank is in green.
| Use case | DeepSeek V3 | Gemini 3.5 Flash |
|---|---|---|
| Agents and tool useMulti-step tasks with tools: support desks, coding agents, function calls | 136 of 161 | 42 of 161 |
| Professional workReal tasks from banking, consulting and law, business documents and freelance projects | not measured | 42 of 51 |
| Reasoning and knowledgeHard questions across science, maths and general knowledge | 168 of 195 | 31 of 195 |
| WritingWhat people prefer in blind comparisons, and judged writing quality | 115 of 187 | 12 of 187 |
| Sticking to the factsSummarising without inventing things, and factual answers | 25 of 153 | 18 of 153 |
| Speed under pressureGood decisions against a real clock (fast chess) | not measured | 3 of 21 |
Every shared result
| Benchmark | Metric | DeepSeek V3 | Gemini 3.5 Flash |
|---|---|---|---|
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,350 | 1,468 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,349 | 1,466 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,348 | 1,491 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,343 | 1,465 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,358 | 1,477 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,356 | 1,472 |
| Artificial Analysisreported | Artificial Analysis Coding Indexindex score | 23.0 | 70.1 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 8.50 | 33.6 |
| Artificial Analysisreported | GPQA Diamond% of questions | 55.7% | 92.2% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 2.9% | 42.7% |
| Artificial Analysisreported | IFBench% of instructions | 34.8% | 76.3% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 29.3% | 74.3% |
| Artificial Analysisreported | SciCode% of problems | 35.8% | 53.9% |
| Artificial Analysisreported | Terminal-Bench 2.1% of tasks | 16.9% | 78.7% |
| Artificial Analysisreported | Terminal-Bench 4.0% of tasks | 0.0% | 6.6% |
| Artificial Analysisreported | Terminal-Bench Hard% of tasks | 6.8% | 46.2% |
| Artificial Analysisreported | Τ-bench banking% of tasks | 4.7% | 32.2% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 22.8% | 95.6% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 17.0% | 9.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.37 | 0.35 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 43.2 | 72.5 |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.
Quick answers
Is DeepSeek V3 better than Gemini 3.5 Flash?
It depends on the task. Among models available today, on our benchmarks and licensed sources, Gemini 3.5 Flash ranks higher for agents and tool use, reasoning and knowledge, writing and sticking to the facts.
Which is cheaper, DeepSeek V3 or Gemini 3.5 Flash?
DeepSeek V3 costs $0.45 per million tokens (three input to one output), against $3.38 for Gemini 3.5 Flash.
Run DeepSeek V3 and Gemini 3.5 Flash on your own prompt
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