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DeepSeek V3.5 is the open-weights model that keeps punching above its weight class on coding benchmarks at a fraction of the cost.
DeepSeek V3.5 continues the pattern: frontier-adjacent quality at a reported price about 10x cheaper than US labs. For coding in particular, benchmarks approach flagship GPT and Claude Sonnet results on selected tasks.
| Factor | DeepSeek V3.5 | Claude Sonnet 4.6 | GPT-5.4 mini |
|---|---|---|---|
| Coding benchmark tier | High | High | High |
| Price per M output | ~$1 | $15 | $4.50 |
| Open weights | Yes | No | No |
| Data trust | Varies by buyer | Enterprise-grade | Enterprise-grade |
client = OpenAI(api_key=os.environ["DEEPSEEK_API_KEY"], base_url="https://api.deepseek.com") resp = client.chat.completions.create(model="deepseek-chat", messages=msgs)OpenAI-compatible. Flip the base URL and try it.Together, Fireworks, and Novita all host DeepSeek V3.5 weights in US data centers. You keep the price advantage without the data-residency headache.
8 questions · take it digitally for instant feedback at tendril.neural-forge.io/learn/quiz/end-modelx-deepseek-v35-builders
What is the main idea of "DeepSeek V3.5 coding"?
Which concept is most central to "DeepSeek V3.5 coding"?
Which use of AI fits this topic best?
What should a careful learner remember about "Know who runs the servers"?
You want to use AI after this lesson. What is the safest next step?
How should AI output about DeepSeek V3.5 be treated?
Name one way to verify an AI answer about DeepSeek V3.5.
Which action would help you apply "DeepSeek V3.5 coding" responsibly?