4
Coding
Strong value for code generation and reasoning, especially through the API or a self-hosted deployment.
DeepSeek: what it is and what it is best at
A Chinese lab known for strong reasoning and coding models at low prices, with open weights.
The short version
At a glance
Made byDeepSeek
CategoryModel makers
Strongest atcoding, privacy & control, data & analytics
NameDeepSeek is the name of the Hangzhou-based lab and its models; it does not abbreviate anything.
Overview
What DeepSeek is
DeepSeek rose to prominence by releasing capable reasoning and coding models at a fraction of the usual cost, many with open weights that others can run and adapt.
That openness makes it popular with developers and researchers, and a frequent subject of governance questions for organizations deciding where their data may go.
Current models. Public reports describe DeepSeek V4 (preview, April 2026) and V4.1 Flash (September 2026). Naming and routing change quickly; check DeepSeek's API changelog.
Where it is strong
Capability profile
Scores are Halden’s editorial view of typical fit on a 0–5 scale. They are not benchmark results and will differ by task, model version and plan: test on your own work.
Coding, analytics, documents, research
How it performs by task
3
Analysis & analytics
Good at step-by-step reasoning on structured problems; validate results independently.
3
Documentation & writing
Capable, but less polished in tone than the leading consumer assistants.
3
Research
Useful for technical questions; sources should be verified.
Practical tips
Get more from DeepSeek
- For sensitive work, consider self-hosting open weights instead of using a hosted app.
- Test the specific model version you plan to use: lineups and routing change often.
- Compare cost per task, not just list price.
Watch-outs
- Hosted use sends data to the provider: review residency and policy first.
- Some organizations restrict use pending a security review.
What has changed recently
Latest news and releases
- DeepSeek V4.1 Flash released
Reports describe the smaller model of the V4.1 family, with price cuts and routing changes for older model names.
Source: VPS Ranking - DeepSeek V4 preview
The V4 family, with Pro and Flash models, was previewed in April.
Source: Framia
Compiled on October 9, 2026 from public reporting, much of it secondary. Dates, names and specifications can change, so confirm on DeepSeek’s own site before you rely on them.
Go deeper
How-to guides for DeepSeek and similar tools
September 27, 2026 · 3 min readChoosing an open-weight model: DeepSeek, Qwen, Mistral and GLM comparedOpen-weight models let you host your own AI. Choosing between them is about licence, language, size, support and the evidence on your own tasks.September 28, 2026 · 3 min readRunning open models privately: a practical starter with OllamaWhen information cannot leave your machines, open models can run locally. Here is how to start without a big infrastructure project.September 25, 2026 · 3 min readAI for coding: from autocomplete to agentsCoding assistance now spans autocomplete, chat, review and autonomous agents. Knowing which to use when avoids wasted effort and avoidable risk.
Keep exploring
Compare with other tools
FAQ
DeepSeek: common questions
Is DeepSeek open source?
Many DeepSeek models are released with open weights under their licences, which lets you host them yourself. Check the licence for each model.
Is DeepSeek safe for company data?
That depends on whether you use the hosted service or self-host, and on your policies. Many organizations review it before allowing use.
Why is DeepSeek cheap?
Its models are designed to be efficient, and the company prices aggressively.
A next step
Choose tools on evidence from your own work.
Run a short pilot with the people who will use DeepSeek, measure the result, and decide with data, not hype.