CCAO-F Using the Claude API Practice Question
Which of the following describes the correct behavior when using the 'stream' parameter in the Messages API?
⚠ Common exam trap
Test-takers frequently assume streaming returns a single modified JSON object or newline-delimited standard JSON, forgetting that Anthropic uses Server-Sent Events (SSE) with discrete event chunks.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The API returns content as it is generated in discrete events.
Setting 'stream' to true causes the API to return a series of Server-Sent Events (SSE) rather than a single JSON object. This is a critical pattern for interactive applications, as it provides an immediate perceived response time for the user. The client must be prepared to handle these discrete events, which include content chunks, metadata, and final completion signals.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The API sends the entire response at once, but with lower latency.
Why it's wrong here
Streaming does not change the latency of the model's total generation; instead, it changes the delivery mechanism. The API sends tokens as they are produced, one by one. The total time until the final token is generated remains roughly the same as a non-streaming request, but the user gets feedback sooner.
- ✓
The API returns content as it is generated in discrete events.
Why this is correct
Streaming mode breaks the output into a stream of events. This is essential for building responsive user interfaces where you want to show the model's output in real-time. By handling these events on the client side, you create a much smoother, more interactive experience for the end user.
- ✗
The API skips the 'messages' array and only accepts a single prompt string.
Why it's wrong here
Streaming is a transport mechanism, not a change to the API schema. Even when streaming is enabled, you must still provide the full 'messages' array in the request body. The schema requirements remain identical to non-streaming requests; only the response format changes from a single JSON object to an event stream.
- ✗
The 'stream' parameter is only available for the Claude 2 model series.
Why it's wrong here
The 'stream' parameter is a fundamental feature of the Claude 3 and 3.5 Messages API. It is fully supported and highly recommended for all modern applications. Limiting its use to older models is incorrect; in fact, streaming is more effective on newer, faster models like Claude 3.5 Sonnet.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Anthropic exam blueprint
This CCAO-F practice question is part of Courseiva's free Anthropic certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CCAO-F exam.