DeepSeek V4 Access Paths and API Modes
Separate entry points before discussing model claims
Many misunderstandings come from mixing the official website, chat entry, API docs, and the raw API endpoint.
Official website
Best for product discovery, official entry confirmation, and links into the chat experience.
Chat entry
Useful for trying Q&A, drafts, and quick tasks before writing code.
API docs
Use this for parameters, model names, Thinking, Tool Calls, JSON Output, and code samples.
API endpoint
Programmatic calls go to api.deepseek.com, not to the browser-facing website.
Console and keys
Developers need API keys, quota management, and a reliable place to validate current docs.
Third-party workflows
IDEs, automation tools, and agent frameworks can use DeepSeek, but should still follow official parameters and response formats.
The official features developers should care about first
These are the capabilities that usually determine whether an integration is stable or fragile.
deepseek-chat
A general-purpose entry for most Q&A, rewriting, summarization, and day-to-day API tasks.
deepseek-reasoner
Better suited to tasks that benefit from stronger step-by-step reasoning.
Thinking parameter
You can also switch modes on deepseek-chat with the thinking parameter instead of relying on one fixed model name.
Tool Calls
For search, function execution, and action-oriented tasks, tool calling is more reliable than plain text only.
JSON Output
Use structured output and schemas whenever the result will be consumed by downstream code.
FIM and beta flows
Completion-style and beta features may require a separate base_url or special settings.
Five steps to integrate DeepSeek into a real product
If the goal is production readiness, not just a demo, follow this order.
Get the right key and mode
Decide whether you need standard chat, stronger reasoning, or a beta feature before you start coding.
Design the message structure
Define system, user, assistant, and tool-message boundaries clearly to avoid unstable multi-turn behavior.
Lock the output format
Choose text, Markdown, JSON, or function arguments up front so downstream handling stays consistent.
Add validation and retries
Protect against missing fields, tool-call failures, empty responses, and truncation issues.
Measure cost and quality
Track success rate, failure cases, token cost, and human review effort if you want to improve the workflow over time.
Common integration questions
A few clarifications prevent a lot of implementation churn.