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SubSchool
Create courses and grade open-ended answers with GPT-5.6
SubSchool uses GPT-5.6 to turn descriptions, books and video libraries into editable courses, and recorded tutoring sessions into follow-up homework. Terra powers everyday generation and grading; teachers can switch to Sol for complex tasks. Grade essays, interviews, photos, and presentations automatically based on grading criteria, keep teachers in control, and let Codex create or update real course content through MCP.
We launched SubSchool on Product Hunt in March. Since then, we have rebuilt the teacher and student applications, moved the main generation and assessment workflows to GPT-5.6, and added a new way to operate the platform through Codex and MCP.
SubSchool is built for teachers who already have knowledge and materials but do not want to spend days converting them into a course.
A teacher can start with a description, a book or a set of video lectures. SubSchool creates editable modules, lessons, descriptions, exercises, and homework directly inside the platform.
For one-on-one lessons, session recordings are transcribed to generate assignments based on what was actually discussed, rather than simply on the topic or title of the lesson.
The same workflow continues after a student submits their work. SubSchool can automatically grade:
- essays and other extended written answers;
- spoken interviews;
- photos of handwritten or visual solutions;
- presentations.
The teacher defines the assessment criteria and their weights. GPT-5.6 returns a score and criterion-specific feedback. The teacher can then review the original submission, change the grade, and add a final comment.
Terra is the default model for everyday generation and grading. Teachers can switch to Sol in their settings for long source materials, curriculum design, complex exercise generation, or assessments that require more reasoning. We decided not to hide this behind automatic model routing. The teacher chooses the balance between cost and model capability.
We also built a SubSchool MCP server. Codex can inspect, create, and update real platform entities such as courses, lessons, and exercises through structured tools. The result is saved directly in SubSchool instead of being generated in one tool and copied manually into another.
GPT-5.6 was also part of how we built this release. We used Sol in Codex Ultra mode to work across the existing codebase, develop the MCP integration and Events section, and ship the redesigned teacher and student web applications.
The release also includes:
- a new student mobile app;
- Events;
- tutor discovery and lesson requests;
- redesigned teacher and student web applications.
The current applications are available at:
teacher.subschool.us
class.subschool.us
The previous versions remain available at:
teacher-old.subschool.us
class-old.subschool.us
The old applications are still online, so the redesign and workflow changes can be compared directly rather than judged from selected screenshots.
The part we are still working through is where automation should stop.
Which actions would you allow to run automatically after a teacher has configured them, and which should always require explicit teacher approval?
About SubSchool on Product Hunt
“Create courses and grade open-ended answers with GPT-5.6”
SubSchool was submitted on Product Hunt and earned 8 upvotes and 1 comments, placing #81 on the daily leaderboard. SubSchool uses GPT-5.6 to turn descriptions, books and video libraries into editable courses, and recorded tutoring sessions into follow-up homework. Terra powers everyday generation and grading; teachers can switch to Sol for complex tasks. Grade essays, interviews, photos, and presentations automatically based on grading criteria, keep teachers in control, and let Codex create or update real course content through MCP.
On the analytics side, SubSchool competes within Android, Education, Artificial Intelligence and Online Learning — topics that collectively have 614.1k followers on Product Hunt. The dashboard above tracks how SubSchool performed against the three products that launched closest to it on the same day.
Who hunted SubSchool?
SubSchool was hunted by Maksim Mamchur. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of SubSchool including community comment highlights and product details, visit the product overview.
Maksim Mamchur