Built for subjective and descriptive answers
Not just keyword matching. GradeLab understands the response semantically, detects valid solution paths, and awards marks per your rubric with step-wise credit and evidence.
Step Marking
Award partial credit for each step in a solution. Detect correct intermediate steps even if the final answer is wrong.
Alternate Valid Approaches
Recognise multiple valid solution paths. Award full marks for correct alternate methods, not just the model answer.
Descriptive Questions
Grade long-form descriptive answers with semantic understanding. Key-point detection and source-grounded evaluation.
Rubric-Based Scoring
Apply your marking scheme with criterion-level granularity. Each criterion scored independently with evidence.
Human Review
Low-confidence results route to a reviewer queue. Examiners override, adjust, and approve before publishing.
Multilingual Support
Grade answers written in English and regional Indian languages. Hindi, Tamil, Telugu, Bengali, and more.
From student response to structured grade
Define your rubric, send responses, receive question-level marks with step-wise credit and feedback. Async webhooks for batch processing.
Define Question & Rubric
Set the question, model answer, key points, and marking scheme. Define step-wise credit allocation.
Send Student Responses
Submit typed or handwritten responses via API. Batch up to 500 per call with async processing.
AI Evaluation
GradeLab reads the response, matches key points, detects steps, and awards marks per your rubric.
Confidence & Review
Low-confidence results route to a reviewer. Examiners see AI marks, evidence, and reasoning before deciding.
Structured Output
Receive question-level marks, step-wise credit, feedback, and confidence via webhook or polling.
Sync Results
Write marks and feedback back to your exam platform, ERP, or LMS through your existing connectors.
Define Question & Rubric
Set the question, model answer, key points, and marking scheme. Define step-wise credit allocation.
Send Student Responses
Submit typed or handwritten responses via API. Batch up to 500 per call with async processing.
AI Evaluation
GradeLab reads the response, matches key points, detects steps, and awards marks per your rubric.
Confidence & Review
Low-confidence results route to a reviewer. Examiners see AI marks, evidence, and reasoning before deciding.
Structured Output
Receive question-level marks, step-wise credit, feedback, and confidence via webhook or polling.
Sync Results
Write marks and feedback back to your exam platform, ERP, or LMS through your existing connectors.
Google Classroom
Canvas
Blackboard
MoodleSubjective Answer Grading API FAQ
Does the API support step marking and partial credit?
Yes. The API awards partial credit for each step in a solution. It detects correct intermediate steps even if the final answer is wrong, and allocates marks per your marking scheme.
Can the API recognize alternate valid approaches?
Yes. The API recognises multiple valid solution paths and awards full marks for correct alternate methods, not just the model answer. This is critical for mathematics and engineering exams.
Does it support regional Indian languages?
Yes. The API grades answers written in English and regional Indian languages including Hindi, Tamil, Telugu, Bengali, and more. Multilingual support is built in.
How does the API handle long-form descriptive answers?
The API uses semantic understanding rather than keyword matching. It detects key points, evaluates the structure of the argument, and scores against your rubric with source-grounded evaluation.
Can we define custom marking schemes?
Yes. You define the question, model answer, key points, and marking scheme with step-wise credit allocation. Rubrics support criterion-level granularity and can be versioned.
What is the batch processing limit?
You can send up to 500 submissions per API call with async processing. Results are delivered via signed webhooks. Idempotency keys ensure safe retries and deduplication.
All GradeLab API products
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Turn your OSM into AI-assisted evaluation. Three modes.
Exam Grading API
Grade paper and digital exams through one API.
LMS AI Grading
Add AI grading to your LMS via LTI, AGS, and OneRoster.
Grade subjective answers with step marking and partial credit
Book a demo and see the API grade descriptive and subjective answers in real time. We'll walk you through integration architecture, deployment options, and pricing for your volume.
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