DeepSeek V3.1 Terminus vs Qwen3.5 Plus 2026-02-15
| Signal | DeepSeek V3.1 Terminus | Delta | Qwen3.5 Plus 2026-02-15 |
|---|---|---|---|
Capabilities | 67 | -17 | |
Benchmarks | 69 | +69 | |
Pricing | 99 | +1 | |
Context window size | 83 | -12 | |
Recency | 75 | -25 | |
Output Capacity | 75 | -5 | |
| Overall Result | 2 wins | of 6 | 4 wins |
Score History
69.3
current score
DeepSeek V3.1 Terminus
right now
68.2
current score
DeepSeek V3.1 Terminus
DeepSeek
Qwen3.5 Plus 2026-02-15
Alibaba
DeepSeek V3.1 Terminus saves you $27.00/month
That's $324.00/year compared to Qwen3.5 Plus 2026-02-15 at your current usage level of 100K calls/month.
| Metric | DeepSeek V3.1 Terminus | Qwen3.5 Plus 2026-02-15 | Winner |
|---|---|---|---|
| Overall Score | 69 | 68 | DeepSeek V3.1 Terminus |
| Rank | #166 | #171 | DeepSeek V3.1 Terminus |
| Quality Rank | #166 | #171 | DeepSeek V3.1 Terminus |
| Adoption Rank | #166 | #171 | DeepSeek V3.1 Terminus |
| Parameters | -- | -- | -- |
| Context Window | 164K | 1000K | Qwen3.5 Plus 2026-02-15 |
| Pricing | $0.27/$1.00/M | $0.26/$1.56/M | -- |
| Signal Scores | |||
| Capabilities | 67 | 83 | Qwen3.5 Plus 2026-02-15 |
| Benchmarks | 69 | -- | DeepSeek V3.1 Terminus |
| Pricing | 99 | 98 | DeepSeek V3.1 Terminus |
| Context window size | 83 | 95 | Qwen3.5 Plus 2026-02-15 |
| Recency | 75 | 100 | Qwen3.5 Plus 2026-02-15 |
| Output Capacity | 75 | 80 | Qwen3.5 Plus 2026-02-15 |
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 68/100 (rank #171), placing it in the top 41% of all 290 models tracked.
With only a 1-point gap, these models are in the same performance tier. The practical difference in output quality is minimal - your choice should depend on pricing, latency requirements, and specific feature needs.
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 Qwen3.5 Plus 2026-02-15 when you need:
- Processing long documents or large codebases (1000K token context)
- Multimodal workflows that require image understanding
- Step-by-step reasoning and chain-of-thought problem solving
DeepSeek V3.1 Terminus offers 30% better value per quality point. At 1M tokens/day, you'd spend $19.05/month with DeepSeek V3.1 Terminus vs $27.30/month with Qwen3.5 Plus 2026-02-15 - a $8.25 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 (1000K 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 (69/100) 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
DeepSeek V3.1 Terminus and Qwen3.5 Plus 2026-02-15 are extremely close in overall performance (only 1.0999999999999943 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
By Use Case
Best for Quality
DeepSeek V3.1 Terminus
Marginally better benchmark scores; both are excellent
Best for Cost
DeepSeek V3.1 Terminus
30% 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 - 30% 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 | Qwen3.5 Plus 2026-02-15 |
|---|---|---|
| Vision (Image Input)differs | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
DeepSeek V3.1 Terminus
DeepSeek
Qwen3.5 Plus 2026-02-15
Alibaba
DeepSeek V3.1 Terminus saves you $0.6540/month
That's 28% cheaper than Qwen3.5 Plus 2026-02-15 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 | Qwen3.5 Plus 2026-02-15 |
|---|---|---|
| Context Window | 164K | 1M |
| Max Output Tokens | 32,768 | 65,536 |
| Open Source | Yes | No |
| Created | Sep 22, 2025 | Feb 16, 2026 |