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Grammarly AI

by Grammarly

Last researched May 31, 2026
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AI writing assistant with grammar, tone, and style suggestions for professional communication

Refreshed weekly

Built on

The underlying foundation model(s) this product runs on, per publicly disclosed evidence.

  • OpenAI GPT-4primary

    Grammarly's 2023 announcement of generative AI features powered by OpenAI's GPT-4

    vendor-confirmedEvidence
  • Grammarly Grammarly GenAI (proprietary)primary

    Grammarly's own fine-tuned generative AI models for writing suggestions and rephrasing

    vendor-confirmedEvidence

Model details

Model family
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Base model
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Context window
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Input modalities
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Output modalities
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Access
Proprietary
Pricing
subscription
API available
Yes

Mantle Index

Equity Score

Mixed

Measures fairness across demographic groups. Higher is more equitable.

62/ 100

Safety Score

Mixed

Measures resistance to harmful outputs. Higher is safer.

71/ 100

The Equity Score and Safety Score roll up the latest Mantle Index assessment. Component breakdowns and risk-tier justification are available on Pro and Enterprise.

Benchmark sub-scores

Security score

45/ 100 · Needs work

Computed from compliance, encryption, data handling, documentation, and vendor contacts — multiplied by research confidence (medium).

Vendor contacts

Certifications

  • SOC 2 Type II
  • ISO 27001
  • GDPR

Research coverage

0 dimensions fully covered · 0 partially covered.

    Supply chain

    No supply-chain links recorded yet.

    Citations

    No public citations recorded yet.

    Recent changes

    No changes recorded yet.

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