Answers quoted from your text
The answer is an exact span pulled from your context — never paraphrased or invented.
CatalogLatency Typically 1–3 seconds Async false Rate Limit Per API key Max Input Long contexts are handled automatically
cn8/text-qa
Send a question and a context passage, and get back the exact span of text in that
Learn more about Question Answering Text NLPsyncInstant previewtextanalysisnlp
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Context
Question
Result
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Overview
Send a question and a context passage, and get back the exact span of text in that passage that answers it. The response includes the answer, a confidence score, the start and end character offsets of the answer in the context, and an is_confident flag. Because the answer is quoted directly from your text, there's no hallucination. Responses are synchronous — one request, one result.
Key capabilities
Character offsets
start and end give the exact position of the answer in your context string, ready for highlighting.
Confidence flag
is_confident is a simple boolean you can use to decide when to show the answer or fall back.
Multilingual
Question and context can be in many languages, not just English.
When to use it
Document QA
Let users ask questions over a retrieved document chunk or article.
FAQ from passages
Match questions to policy text, help articles, or product documentation.
Support automation
Retrieve the right passage first (with Semantic Search), then extract the precise answer here.
Input & output
input
A question and a context passage.
JSON body
output
The answer span, a confidence score, start/end offsets, and an is_confident flag.
JSON
Guides & tips
How it works
- You provide a
questionand acontextpassage, and the service finds the span of the context that answers it. - The answer is always an exact quote from your context, located by the
startandendcharacter offsets — handy for highlighting in your UI. - Use
is_confident(or thescore) to decide whether to show the answer or fall back to "I don't know".
When the answer isn't in the passage
- If the context doesn't contain the answer,
is_confidentwill befalseand thescorewill be low. Show a fallback message instead of the extracted span. - For questions over a larger knowledge base, pair this with Semantic Search: retrieve the best passage first, then ask the question here.
Specs
Schema
Request body
questionrequiredstringThe question to answer.
contextrequiredstringThe passage that should contain the answer. Send a single passage per request.
Response
answerstringThe exact answer span, quoted from your context.
scorenumberConfidence in the answer, from 0 to 1.
startintegerStart character offset of the answer in the context.
endintegerEnd character offset of the answer in the context.
is_confidentbooleanTrue when the answer is reliable — a convenient flag for deciding when to show it.
Pricing
Billed per request.
| Service | Unit | Price |
|---|---|---|
| Question Answering | item | $0.006/request |