Cost / No mystery tokens

What does AI grading actually cost?

Add a worksheet or marking guide. The calculator estimates the paid API cost for your grading workload, then compares it with an editable monthly AI-grading subscription.

0 characters
No file selected

Private Google Docs need permission. For the beta, paste the link and download a Word copy, then upload that file here. The document is read locally in your browser. One-click private Drive import can be added later with separate Google Drive permission.

Your grading workload

How much are you actually grading?

25 students × 5 groups × 3 graded tasks = 375 submissions / month
Choose a workloadEach preset shows the estimated yearly saving for the worksheet, model and comparison price you selected.
Typical teaching-group size
How many groups you regularly grade
How many pieces of work you grade for each group
API usage only happens during the months you are grading

Optional. Enter the monthly price of an AI grading tool you want to compare.

$/ month

Estimate only. Grade Drafter sends structured prompts and output length varies by assignment. This version estimates tokens from text length and a conservative workflow overhead; real API usage will differ.

Different APIs are cheap in different ways.

Grade Drafter currently integrates with Gemini. The other rows are included to make the underlying market visible, not to imply they are already supported in the extension.

Model
Input / 1M
Output / 1M
Status
Gemini 3.5 Flash-Lite
$0.30
$2.50
✓ Fast · lowest cost
Gemini 3.8 Flash
$0.75*
$3.75*
✓ Careful · longer text / essays
OpenAI GPT-5.6 Luna
$0.20
$1.20
Reference only
Claude Haiku 4.5
$1.00
$5.00
Reference only

Prices verified 11 Sep 2026 from official provider pages. *Gemini 3.8 Flash is currently $0.75/M input and $3.75/M output through 31 Dec 2026; Google lists $1.50/M and $7.50/M from 1 Jan 2027. Provider prices can change.

Google pricing ↗  ·  OpenAI pricing ↗  ·  Anthropic pricing ↗