DeepSeek V3.1 Terminus vs Gemini 3.5 Flash
| Signal | DeepSeek V3.1 Terminus | Delta | Gemini 3.5 Flash |
|---|---|---|---|
Capabilities | 67 | -33 | |
Benchmarks | 69 | -8 | |
Pricing | 99 | +8 | |
Context window size | 83 | -13 | |
Recency | 75 | -25 | |
Output Capacity | 75 | -5 | |
| Overall Result | 1 wins | of 6 | 5 wins |
Score History
69.3
current score
Gemini 3.5 Flash
right now
79
current score
DeepSeek V3.1 Terminus
DeepSeek
Gemini 3.5 Flash
DeepSeek V3.1 Terminus saves you $523.00/month
That's $6276.00/year compared to Gemini 3.5 Flash at your current usage level of 100K calls/month.
| Metric | DeepSeek V3.1 Terminus | Gemini 3.5 Flash | Winner |
|---|---|---|---|
| Overall Score | 69 | 79 | Gemini 3.5 Flash |
| Rank | #166 | #100 | Gemini 3.5 Flash |
| Quality Rank | #166 | #100 | Gemini 3.5 Flash |
| Adoption Rank | #166 | #100 | Gemini 3.5 Flash |
| Parameters | -- | -- | -- |
| Context Window | 164K | 1049K | Gemini 3.5 Flash |
| Pricing | $0.27/$1.00/M | $1.50/$9.00/M | -- |
| Signal Scores | |||
| Capabilities | 67 | 100 | Gemini 3.5 Flash |
| Benchmarks | 69 | 77 | Gemini 3.5 Flash |
| Pricing | 99 | 91 | DeepSeek V3.1 Terminus |
| Context window size | 83 | 96 | Gemini 3.5 Flash |
| Recency | 75 | 100 | Gemini 3.5 Flash |
| Output Capacity | 75 | 80 | Gemini 3.5 Flash |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 69/100 (rank #166), placing it in the top 43% of all 290 models tracked.
Scores 79/100 (rank #100), placing it in the top 66% of all 290 models tracked.
Gemini 3.5 Flash has a 10-point advantage, which typically translates to noticeably better performance on complex reasoning, code generation, and multi-step tasks.
Choose DeepSeek V3.1 Terminus when you need:
- High-volume production workloads where API costs must be minimized
- Step-by-step reasoning and chain-of-thought problem solving
- Self-hosted deployments where you need full control over the model
Choose Gemini 3.5 Flash when you need:
- Processing long documents or large codebases (1049K token context)
- Multimodal workflows that require image understanding
- Step-by-step reasoning and chain-of-thought problem solving
DeepSeek V3.1 Terminus offers 88% better value per quality point. At 1M tokens/day, you'd spend $19.05/month with DeepSeek V3.1 Terminus vs $157.50/month with Gemini 3.5 Flash - a $138.45 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. DeepSeek V3.1 Terminus also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (1049K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($1.00/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (79/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
Gemini 3.5 Flash has a moderate advantage with a 9.700000000000003-point lead in composite score. It wins on more signal dimensions, but DeepSeek V3.1 Terminus has specific strengths that could make it the better choice for certain workflows.
By Use Case
Best for Quality
DeepSeek V3.1 Terminus
Marginally better benchmark scores; both are excellent
Best for Cost
DeepSeek V3.1 Terminus
88% lower pricing; better value at scale
Best for Reliability
DeepSeek V3.1 Terminus
Higher uptime and faster response speeds
Best for Prototyping
DeepSeek V3.1 Terminus
Stronger community support and better developer experience
Best for Production
DeepSeek V3.1 Terminus
Wider enterprise adoption and proven at scale
by DeepSeek
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Cost - 88% lower pricing; better value at scale
- Choose for Reliability - Higher uptime and faster response speeds
- Choose for Prototyping - Stronger community support and better developer experience
- Choose for Production - Wider enterprise adoption and proven at scale
| Capability | DeepSeek V3.1 Terminus | Gemini 3.5 Flash |
|---|---|---|
| Vision (Image Input)differs | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Searchdiffers | ||
| Image Output |
DeepSeek V3.1 Terminus
DeepSeek
Gemini 3.5 Flash
DeepSeek V3.1 Terminus saves you $11.81/month
That's 88% cheaper than Gemini 3.5 Flash at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | DeepSeek V3.1 Terminus | Gemini 3.5 Flash |
|---|---|---|
| Context Window | 164K | 1.0M |
| Max Output Tokens | 32,768 | 65,536 |
| Open Source | Yes | No |
| Created | Sep 22, 2025 | May 19, 2026 |