Which needs less VRAM, GigaChat 20B A3B Base or AI21 Jamba Mini 1.5?

At BF16, GigaChat 20B A3B Base needs 40.5 GB and AI21 Jamba Mini 1.5 needs 113.5 GB, so GigaChat 20B A3B Base is the lighter option to run locally.

What is the difference between GigaChat 20B A3B Base and AI21 Jamba Mini 1.5?

GigaChat 20B A3B Base is a 20B model from ai-sage, while AI21 Jamba Mini 1.5 is a 51.6B model from AI21 Labs. Compare their VRAM requirements above to see which fits your GPU or Mac.

GigaChat 20B A3B Base vs AI21 Jamba Mini 1.5

Side-by-side comparison of VRAM requirements, quantization, context length, and hardware compatibility.

GigaChat 20B A3B Base

ai-sage · 20B

Chat

AI21 Jamba Mini 1.5

AI21 Labs · 51.6B

Chat

Specifications

	GigaChat 20B A3B Base	AI21 Jamba Mini 1.5
Parameters	20B	51.6B
Context	131K	—
Architecture	DeepseekForCausalLM	—
License	MIT	Other
Downloads	4.4K	10.0K
Released	Jun 2025	Feb 2026

VRAM by Quantization: GigaChat 20B A3B Base vs AI21 Jamba Mini 1.5

Quantization	Bits	GigaChat 20B A3B Base VRAM	AI21 Jamba Mini 1.5 VRAM
BF16	16.00	40.5 GB	113.5 GB

Verdict

GigaChat 20B A3B Base needs less VRAM at BF16 (40.5 GB vs 113.5 GB), so it fits on smaller GPUs. AI21 Jamba Mini 1.5 is the more widely downloaded of the two.

Frequently Asked Questions

Which needs less VRAM, GigaChat 20B A3B Base or AI21 Jamba Mini 1.5?: At BF16, GigaChat 20B A3B Base needs 40.5 GB and AI21 Jamba Mini 1.5 needs 113.5 GB, so GigaChat 20B A3B Base is the lighter option to run locally.
What is the difference between GigaChat 20B A3B Base and AI21 Jamba Mini 1.5?: GigaChat 20B A3B Base is a 20B model from ai-sage, while AI21 Jamba Mini 1.5 is a 51.6B model from AI21 Labs. Compare their VRAM requirements above to see which fits your GPU or Mac.