Which needs less VRAM, AI21 Jamba Mini 1.5 or AFM 4.5B?

At BF16, AI21 Jamba Mini 1.5 needs 113.5 GB and AFM 4.5B needs 9.7 GB, so AFM 4.5B is the lighter option to run locally.

What is the difference between AI21 Jamba Mini 1.5 and AFM 4.5B?

AI21 Jamba Mini 1.5 is a 51.6B model from AI21 Labs, while AFM 4.5B is a 4.6B model from Arcee AI. Compare their VRAM requirements above to see which fits your GPU or Mac.

AI21 Jamba Mini 1.5 vs AFM 4.5B

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

AI21 Jamba Mini 1.5

AI21 Labs · 51.6B

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AFM 4.5B

Arcee AI · 4.6B

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Specifications

	AI21 Jamba Mini 1.5	AFM 4.5B
Parameters	51.6B	4.6B
Context	—	66K
Architecture	—	ArceeForCausalLM
License	Other	Apache 2.0
Downloads	10.0K	1.5K
Released	Feb 2026	Sep 2025

VRAM by Quantization: AI21 Jamba Mini 1.5 vs AFM 4.5B

Quantization	Bits	AI21 Jamba Mini 1.5 VRAM	AFM 4.5B VRAM
BF16	16.00	113.5 GB	9.7 GB

Verdict

AFM 4.5B needs less VRAM at BF16 (9.7 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, AI21 Jamba Mini 1.5 or AFM 4.5B?: At BF16, AI21 Jamba Mini 1.5 needs 113.5 GB and AFM 4.5B needs 9.7 GB, so AFM 4.5B is the lighter option to run locally.
What is the difference between AI21 Jamba Mini 1.5 and AFM 4.5B?: AI21 Jamba Mini 1.5 is a 51.6B model from AI21 Labs, while AFM 4.5B is a 4.6B model from Arcee AI. Compare their VRAM requirements above to see which fits your GPU or Mac.