Which has a longer context window, AFM 4.5B or Arch Router 1.5B?

AFM 4.5B supports 65,536 tokens and Arch Router 1.5B supports 32,768 tokens.

What is the difference between AFM 4.5B and Arch Router 1.5B?

AFM 4.5B is a 4.6B model from Arcee AI, while Arch Router 1.5B is a 1.5B model from katanemo. Compare their VRAM requirements above to see which fits your GPU or Mac.

AFM 4.5B vs Arch Router 1.5B

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

AFM 4.5B

Arcee AI · 4.6B

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Arch Router 1.5B

katanemo · 1.5B

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Specifications

	AFM 4.5B	Arch Router 1.5B
Parameters	4.6B	1.5B
Context	66K	33K
Architecture	ArceeForCausalLM	Qwen2ForCausalLM
License	Apache 2.0	Other
Downloads	1.5K	1.6K
Released	Sep 2025	Apr 2026

VRAM by Quantization: AFM 4.5B vs Arch Router 1.5B

Quantization	Bits	AFM 4.5B VRAM	Arch Router 1.5B VRAM
BF16	16.00	9.7 GB	—
FP16	16.00	—	3.5 GB

Verdict

AFM 4.5B supports a longer context window (66K tokens). Arch Router 1.5B is the more widely downloaded of the two.

Frequently Asked Questions

Which has a longer context window, AFM 4.5B or Arch Router 1.5B?: AFM 4.5B supports 65,536 tokens and Arch Router 1.5B supports 32,768 tokens.
What is the difference between AFM 4.5B and Arch Router 1.5B?: AFM 4.5B is a 4.6B model from Arcee AI, while Arch Router 1.5B is a 1.5B model from katanemo. Compare their VRAM requirements above to see which fits your GPU or Mac.