AI21 Jamba2 vs Grammarly

Which one should you pick? Here's the full breakdown.

Our Pick

AI21 Jamba2

A
8.0/10

AI21 Labs' hybrid SSM-Transformer (Mamba-style) open-weight family -- Jamba2 launched 2026-01-08. Two sizes: 3B dense (runs on phones / laptops) and Jamba2 Mini MoE (12B active / 52B total). Apache 2.0, 256K context, mid-trained on 500B tokens

Grammarly

A
8.0/10

AI writing assistant that catches errors everywhere you type -- now with full AI rewriting

CategoryAI21 Jamba2Grammarly
Ease of Use6.510.0
Output Quality8.07.0
Value9.07.0
Features8.58.0
Overall8.08.0

Pricing Comparison

FeatureAI21 Jamba2Grammarly
Free TierYesYes
Starting Price$0$0

Which Should You Pick?

Pick AI21 Jamba2 if...

  • ✓Higher output quality (8 vs 7)
  • ✓Better value for money (9/10)

Developers building long-context RAG systems (256K context with manageable memory is the sweet spot), mobile/edge deployments where Jamba2 3B's hybrid efficiency shines, and teams that want to experiment with non-transformer architectures while staying in Apache-2.0 territory. Also good for Israeli + EU enterprise procurement where AI21's geography / GDPR posture matters.

Visit AI21 Jamba2

Pick Grammarly if...

  • ✓Easier to use (10 vs 6.5)

Non-native English speakers, professionals who write lots of emails, and anyone who wants a passive grammar net running in the background. It catches things you'd miss.

Visit Grammarly

Our Verdict

AI21 Jamba2 and Grammarly are extremely close overall. Your choice comes down to specific needs -- AI21 Jamba2 is better for developers building long-context rag systems (256k context with manageable memory is the sweet spot), mobile/edge deployments where jamba2 3b's hybrid efficiency shines, and teams that want to experiment with non-transformer architectures while staying in apache-2, while Grammarly works best for non-native english speakers, professionals who write lots of emails, and anyone who wants a passive grammar net running in the background.