AI21 Jamba Reasoning 3B vs Arch Router 1.5B
Side-by-side comparison of VRAM requirements, quantization, context length, and hardware compatibility.
Specifications
| AI21 Jamba Reasoning 3B | Arch Router 1.5B | |
|---|---|---|
| Parameters | 3.2B | 1.5B |
| Context | 262K | 33K |
| Architecture | JambaForCausalLM | Qwen2ForCausalLM |
| License | Apache 2.0 | Other |
| Downloads | 2.9K | 1.6K |
| Released | Oct 2025 | Apr 2026 |
VRAM by Quantization: AI21 Jamba Reasoning 3B vs Arch Router 1.5B
| Quantization | Bits | AI21 Jamba Reasoning 3B VRAM | Arch Router 1.5B VRAM |
|---|---|---|---|
| BF16 | 16.00 | 6.7 GB | — |
| FP16 | 16.00 | — | 3.5 GB |
Verdict
AI21 Jamba Reasoning 3B supports a longer context window (262K tokens). AI21 Jamba Reasoning 3B is the more widely downloaded of the two.
Frequently Asked Questions
- Which has a longer context window, AI21 Jamba Reasoning 3B or Arch Router 1.5B?
AI21 Jamba Reasoning 3B supports 262,144 tokens and Arch Router 1.5B supports 32,768 tokens.
- What is the difference between AI21 Jamba Reasoning 3B and Arch Router 1.5B?
AI21 Jamba Reasoning 3B is a 3.2B model from AI21 Labs, 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.