1Z0-1127-25 Deploying and Managing Generative AI on OCI Practice Question
A data scientist is using the OCI Generative AI service to generate text completions. The API calls are returning HTTP 400 errors with the message 'Invalid model parameters'. What is the most likely cause?
⚠ Common exam trap
Oracle often tests the distinction between HTTP 4xx error codes and their specific meanings, so the trap here is that candidates may confuse a 400 Bad Request (parameter validation failure) with authentication (401) or rate-limiting (429) errors, especially when the error message is generic.
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
✓
One or more model parameters (e.g., temperature, top_p) are outside the accepted range
The HTTP 400 error with 'Invalid model parameters' directly indicates that one or more of the parameters sent in the API request (such as temperature, top_p, max_tokens, or stop sequences) are outside the acceptable range defined by the OCI Generative AI service. For example, temperature must be between 0 and 1, and top_p between 0 and 1, and sending a value like 2.0 for temperature would trigger this error. The other options (expired key, rate limit, incorrect endpoint) would produce different HTTP status codes or error messages.
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 key is expired
Why it's wrong here
Expired key returns 401 Unauthorized.
- ✗
The request exceeds the rate limit
Why it's wrong here
Rate limit exceeds yield 429 Too Many Requests.
- ✗
The endpoint URL is incorrect
Why it's wrong here
Incorrect URL returns 404 or connection error.
- ✓
One or more model parameters (e.g., temperature, top_p) are outside the accepted range
Why this is correct
Invalid parameters lead to client error 400.
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