- A
Exceeded token limit
Why wrong: Exceeding token limit may cause a 400 error but with a different message.
- B
Network timeout
Why wrong: Network timeout causes a connection error, not InvalidParameter.
- C
Invalid model name
An invalid model name is a parameter error, resulting in 400 InvalidParameter.
- D
Missing API key
Why wrong: Missing API key results in authentication failure, not InvalidParameter.
Question 161 of 991
InvalidParameter Error: Invalid Model Name in OCI GenAI
This 1Z0-1127 practice question tests your understanding of fundamentals of large language models. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is using the OCI Generative AI Python SDK. They receive a 400 error 'InvalidParameter'. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
Invalid model name
The 400 'InvalidParameter' error in the OCI Generative AI Python SDK specifically indicates that the request contained a parameter that is not recognized or is malformed. The most common cause is providing an incorrect or unsupported model name, as the SDK validates model names against a predefined list of available models in the OCI Generative AI service. Other parameter errors, such as invalid temperature or top_p values, would also produce this error, but model name mismatches are the most frequent trigger.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Exceeded token limit
Why it's wrong here
Exceeding token limit may cause a 400 error but with a different message.
- ✗
Network timeout
Why it's wrong here
Network timeout causes a connection error, not InvalidParameter.
- ✓
Invalid model name
Why this is correct
An invalid model name is a parameter error, resulting in 400 InvalidParameter.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Missing API key
Why it's wrong here
Missing API key results in authentication failure, not InvalidParameter.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between HTTP status codes and their specific error messages, so candidates may confuse a 400 error with authentication issues (Option D) or rate limiting, but the 'InvalidParameter' message narrows it to a malformed request parameter like the model name.
Detailed technical explanation
How to think about this question
The OCI Generative AI SDK uses the OCI Python SDK's base client, which sends HTTP requests to the OCI API endpoint (e.g., https://inference.generativeai.us-chicago-1.oci.oraclecloud.com). The 'InvalidParameter' error is raised by the OCI API gateway when the request body fails schema validation, such as an unrecognized model name like 'cohere.command-light' instead of the correct 'cohere.command-light-v14.1'. This validation occurs before any model inference, so even a typo in the model name will immediately fail with this error.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-1127 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 1Z0-1127 question test?
Fundamentals of Large Language Models — This question tests Fundamentals of Large Language Models — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Invalid model name — The 400 'InvalidParameter' error in the OCI Generative AI Python SDK specifically indicates that the request contained a parameter that is not recognized or is malformed. The most common cause is providing an incorrect or unsupported model name, as the SDK validates model names against a predefined list of available models in the OCI Generative AI service. Other parameter errors, such as invalid temperature or top_p values, would also produce this error, but model name mismatches are the most frequent trigger.
What should I do if I get this 1Z0-1127 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This 1Z0-1127 practice question is part of Courseiva's free Oracle 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 1Z0-1127 exam.
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