Claude Sonnet 4.6 vs DeepSeek V3.1 Terminus (Comparative Analysis)
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Comparative Analysis: Claude Sonnet 4.6 vs. DeepSeek V3.1 Terminus
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Overview
DeepSeek V3.1 Terminus was released 4 months before Claude Sonnet 4.6.
 Claude Sonnet 4.6 |  DeepSeek V3.1 Terminus | |
|---|---|---|
Model Provider The organization behind this AI's development | Anthropic | DeepSeek |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 163.8K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 32.8K tokens |
Release Date When this model first became publicly available | February 17, 2026 5 months ago February 17th, 2026 | September 22, 2025 10 months ago September 22nd, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | March 31, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Claude Sonnet 4.6 | DeepSeek V3.1 Terminus | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File | 📝Text |
Reasoning Controls Defaults and configurable reasoning effort | OptionalEffort: Max, High, Medium, LowDefault: Medium | Optional |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Claude | DeepSeek |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Open Source Model availability | Proprietary | Available on HuggingFace → |
Pricing
Claude Sonnet 4.6 is roughly 11.1x more expensive compared to DeepSeek V3.1 Terminus for input tokens and roughly 15.0x more expensive for output tokens.
| Claude Sonnet 4.6 | DeepSeek V3.1 Terminus | |
|---|---|---|
Input Token Cost Cost per million input tokens | $3.00 per million tokens | $0.27 per million tokens |
Output Token Cost Cost per million output tokens | $15.00 per million tokens | $1.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | Not specified |
Cache Read Cost Cost to reuse cached input tokens | $0.30 per million tokens | $0.14 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $3.75 per million tokens | Not specified |
1-Hour Cache Write Cost Cost to cache input tokens for one hour | $6.00 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Claude Sonnet 4.6 and DeepSeek V3.1 Terminus.
| Claude Sonnet 4.6 | DeepSeek V3.1 Terminus | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 47.2 (Artificial Analysis index; higher is better) | 30.4 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | 63 (Artificial Analysis index; higher is better) | 43.5 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | 40.8 (Artificial Analysis index; higher is better) | 18.1 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,315 Elo (#12 in Game Dev (60.2% win rate)) | 1,220 Elo (#41 in UI Component (59.3% win rate)) |
At a Glance
Quick overview of what makes Claude Sonnet 4.6 and DeepSeek V3.1 Terminus unique.
Claude Sonnet 4.6 by Anthropic understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Premium pricing at $3.00/M input and $15.00/M output tokens. Includes built-in content moderation for safer outputs. Released February 17th, 2026.DeepSeek V3.1 Terminus by DeepSeek can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 163.8K token context window. Very affordable at $0.27/M input and $1.00/M output tokens. Released September 22nd, 2025.Explore More Comparisons
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Compare DeepSeek V3.1 Terminus with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
Multilingual translation tasks