Meet the AI Grader: grade anything with precision
Grading open-ended assignments has always been one of the most time-consuming parts of teaching. Whether it's an essay, a programming assignment, a Turtle Graphics project, or another creative response, providing meaningful feedback takes time.
That's why we're excited to introduce the new AI Grader in Cobi.
Bulk grading in action
Grade Anything
AI Grader can evaluate virtually any type of open-ended question, including:
- Programming assignments
- Turtle Graphics projects
- Algorithms and pseudocode
- Essays
- Games
- Written explanations
- And more
Simply create your own question, and let AI handle the grading.
Your Rubric. Your Standards.
Want students graded according to your own expectations?
Create a custom rubric, and AI will score student work against each criterion while providing detailed feedback for improvement.
Even better, Cobi's curriculum has been updated to include built-in rubrics for all open-ended projects. Every project now comes with a carefully designed scoring rubric, allowing AI Grader to evaluate student work consistently while providing meaningful, criterion-based feedback. Teachers can use these built-in rubrics as-is or customize them to match their own grading standards.
For example:
| Criteria | Points | Description |
|---|---|---|
| Random number generation | 2 pts | randNum is correctly assigned a random integer between 1 and 8 inclusive using random.randint(1, 8) or equivalent. |
Complete elif chain | 3 pts | All 7 elif conditions (values 2–8) are present and correctly structured. |
| Unique responses | 2 pts | Each of the 8 conditions prints a distinct response with no duplicates. |
| Program termination | 1 pt | At least one valid exit method (exit() or playing = False) is correctly implemented. |
| Code runs without errors | 1 pt | The program executes without syntax or runtime errors. |
| Thematic responses | 1 pt | All responses are meaningful answers rather than placeholder text. |
Total: 10 points
The AI evaluates each submission against every rubric criterion, assigns points accordingly, and explains why points were earned or deducted. Students also receive actionable feedback to help them improve.
Grade One Submission or Hundreds
Whether you're reviewing a single assignment or grading an entire class, AI Grader scales to your workflow.
- Grade individual submissions with detailed feedback.
- Grade an entire class in bulk with just a few clicks.
Save hours of manual grading while maintaining consistent scoring.
Updated Cobi Curriculum
We've also updated Cobi's curriculum to include rubrics for open-ended questions throughout our courses.
Now, teachers can immediately start using AI Grader with built-in rubric-based assessments, or customize existing rubrics to fit their classroom needs.
Consistent, Transparent, and Fast
AI Grader doesn't just generate a score. It explains it.
Students receive constructive feedback highlighting what they did well, where they lost points, and how they can improve. Teachers get consistent rubric-based grading while spending significantly less time evaluating assignments.
Let AI handle the grading while you focus on helping students grow. Explore AI Grader today and discover a faster, more consistent way to assess open-ended work.