DeepSeek Made Crystal Clear · chapter 3: Your First API Call
The request and response anatomy of a DeepSeek API call
2026-10-01
The usage block is where Chapters 4 and 11 pick the story back up.
Below: the paragraph from the book that builds this idea, then the diagram itself (Figure 3.1), and a recap. About a minute of reading.
DeepSeek's API changelog also states that, as of the April 2026 V4 release, the API supports both the OpenAI ChatCompletions interface shown above and an Anthropic Messages-style interface. That second option matters if your existing codebase is already built around Anthropic's SDK rather than OpenAI's: you are not locked into one wire format just because this chapter's examples use the OpenAI shape. Either way, the underlying model and the underlying face, Face 2, the hosted API, stay the same; only the request and response shape you code against changes.
Recap
- The idea: The usage block is where Chapters 4 and 11 pick the story back up.
- The picture: Figure 3.1, from chapter 3 ("Your First API Call") of DeepSeek Made Crystal Clear.
- Go deeper: the chapter builds this step by step, with recipes and sources at the end.
This diagram is one of many in DeepSeek Made Crystal Clear.
Every chapter opens with the gist, draws the hard ideas, and ends with recipes and sources.
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