GPTZero vs Optima

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

GPTZero compared with Optima
Detail	GPTZero	Optima
What it does	AI detector that identifies content generated by large language models	Build custom benchmarks to compare frontier models on performance, cost, and time efficiency for your specific tasks
Stage	Not given	Not given
Founded	2023	Not given
Based in	Not given	US
Pricing model	Freemium	Not given
Pricing	Free tier for basic AI detection up to 10,000 characters. Professional plan available with pricing details on subscription page. API pricing available for developers.	Token usage for creating and running benchmarks at raw model cost. Rubric grading: $0.002 per criterion per model (standard judges) or $0.040 per criterion (premium judges), $0.10 on agentic tasks. Pairwise grading: $0.006 per match (standard, $0.150 premium), $0.015 per match on document tasks (sta
Key features	AI detection with 99.9% accuracy Sentence-by-sentence highlighting of AI-generated text Writing Replay showing video proof of writing process Plagiarism detection Grammar checking and writing feedback Chrome extension for browser-based scanning Integration with Canvas and Google Classroom API for developer integration Detects multiple AI models including GPT-5, GPT-6, Gemini, and Claude AI Tutor for writing improvement	Custom benchmark builder with example-driven task creation Multiple evaluation types: Q&A, document analysis, agentic tasks, interactive conversations Run benchmarks across multiple frontier models simultaneously Cost and time per task metrics Standard and premium judge tiers for grading Rubric grading with custom criteria Deterministic objective grading No markup on model token costs
What makes it different	99.9% accuracy rate verified by independent benchmarks from Penn State's AI Research Lab De-biased for ESL learners with only 1% false positive rate for non-native English writing Only detector with Writing Replay showing video proof of authentic writing process Trusted by over 10 million users and 100+ organizations globally	Build benchmarks on your actual tasks and data instead of standardized tests Compare models across performance, cost, and time efficiency simultaneously Grading expertise from major AI evaluations
Community votes	0	0
DR (Domain Rating by Ahrefs)	81 no change since last check	84 −1 (down) since last check
Trust Flow (Majestic)	27	28
Citation Flow (Majestic)	43	59
Referring domains (Majestic)	8387	17353

4 details filled in for both companies.

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