CCDV-F Claude API Mechanics Practice Question
When configuring an API call to generate a specific JSON object, a developer adds the string '}' to the 'stop_sequences' array. What is the most likely outcome of this configuration?
⚠ Common exam trap
Candidates often assume stop sequences are ignored if they are critical to the output format, failing to realize the API stops immediately upon matching the character, causing structural JSON truncation.
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
✓
Claude will generate the JSON object, but the final '}' will be missing from the response.
The 'stop_sequences' parameter tells Claude to stop generating text as soon as a specific string is produced. If a developer uses a character that is required for the structural integrity of the output—like the closing brace of a JSON object—the model will terminate immediately upon producing that character, often leaving the output incomplete or invalid for parsers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Claude will successfully generate the full JSON object and then stop.
Why it's wrong here
Claude stops *immediately* when a stop sequence is encountered. If '}' is the sequence, the model will stop as soon as it writes that character. It will not include the character in the final output string, resulting in a JSON string that is missing its vital closing brace.
- ✗
The API will return an error because stop sequences cannot be single characters.
Why it's wrong here
The Messages API allows single characters as stop sequences. There is no validation error for using a single brace. However, while syntactically valid for the API request, it is logically problematic for the application's goal of receiving a fully formed and valid JSON object from the model.
- ✓
Claude will generate the JSON object, but the final '}' will be missing from the response.
Why this is correct
Stop sequences work by terminating generation the moment the sequence is matched. The matching sequence itself is not included in the response text. Therefore, the model will stop right after it intends to close the JSON, but the actual '}' will be absent from the payload.
- ✗
The model will ignore the stop sequence if it occurs within a code block.
Why it's wrong here
Claude's stop sequence logic is applied at the token generation level and does not have awareness of the semantic context like 'code blocks' or 'JSON structures'. It is a hard termination rule that applies globally to the output stream regardless of the content being generated.
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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
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