Grammarly vs LLaMA 3.1 405B — Which Is Better in 2026?
Grammarly vs LLaMA 3.1 405B: independent head-to-head scored on Performance, Value, Reliability, and Ease of Use. See scores, pros, cons, and our verdict.
Grammarly
Grammarly
Most widely-used AI writing assistant — 50M+ users
Meta
LLaMA 3.1 405B
Best open-source LLM — free to run
8.3
Overall Score
WINNER7.8
Overall Score
Our Verdict
Grammarly scores higher overall (8.3/10 vs 7.8/10), winning on Reliability and Ease of Use. Most widely-used AI writing assistant. 50M+ users. Best for editing, grammar, and tone.
Pricing — Grammarly
Free · Premium $12/mo · Business $15/user/mo
Pricing — LLaMA 3.1 405B
Free (self-hosted) · Cloud inference from $0.003/1K tokens
Grammarly
Pros
- ✓Works everywhere — browser, Word, Google Docs, mobile
- ✓Best grammar and tone detection in market
- ✓Plagiarism checker on Premium
Cons
- ✗Less generative than Claude/ChatGPT
- ✗Premium required for advanced suggestions
- ✗Can be overly prescriptive with style suggestions
Best For
Everyone who writes professionally — editing, tone, grammar, clarity
LLaMA 3.1 405B
Pros
- ✓Fully open-source weights — self-host for free
- ✓No data sent to third parties
- ✓Competitive with GPT-4 class models
Cons
- ✗Requires GPU infrastructure to run
- ✗No official support or SLA
- ✗Harder to set up than hosted solutions
Best For
Privacy-first deployments, open-source enthusiasts, budget-conscious teams with infrastructure
Choose Grammarly if…
- →Reliability is your top priority — Grammarly leads by 3.0 points
- →Everyone who writes professionally — editing
- →You also value Ease of Use — Grammarly wins that dimension too
Choose LLaMA 3.1 405B if…
- →Performance is your top priority — LLaMA 3.1 405B leads by 0.5 points
- →Privacy-first deployments
- →You also value Value — LLaMA 3.1 405B wins that dimension too
Frequently Asked Questions
Is Grammarly better than LLaMA 3.1 405B?
Grammarly scores 8.3/10 overall vs 7.8/10 for LLaMA 3.1 405B, with an edge on Reliability and Ease of Use. That said, "LLaMA 3.1 405B" may be the better pick if performance is your priority. The right choice depends on your use case.
What is the pricing difference between Grammarly and LLaMA 3.1 405B?
Grammarly: Free · Premium $12/mo · Business $15/user/mo. LLaMA 3.1 405B: Free (self-hosted) · Cloud inference from $0.003/1K tokens. Compare usage volumes and features needed to determine total cost of ownership for your team.
Which is better for everyone who writes professionally — editing?
Grammarly is generally stronger here, scoring 8.3/10 overall. Most widely-used AI writing assistant. 50M+ users. Best for editing, grammar, and tone. For more niche requirements like performance, LLaMA 3.1 405B may be worth evaluating.
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