AI21 Jamba Reasoning 3B vs AFM 4.5B
Side-by-side comparison of VRAM requirements, quantization, context length, and hardware compatibility.
Specifications
| AI21 Jamba Reasoning 3B | AFM 4.5B | |
|---|---|---|
| Parameters | 3.2B | 4.6B |
| Context | 262K | 66K |
| Architecture | JambaForCausalLM | ArceeForCausalLM |
| License | Apache 2.0 | Apache 2.0 |
| Downloads | 2.9K | 1.5K |
| Released | Oct 2025 | Sep 2025 |
VRAM by Quantization: AI21 Jamba Reasoning 3B vs AFM 4.5B
| Quantization | Bits | AI21 Jamba Reasoning 3B VRAM | AFM 4.5B VRAM |
|---|---|---|---|
| BF16 | 16.00 | 6.7 GB | 9.7 GB |
Verdict
AI21 Jamba Reasoning 3B needs less VRAM at BF16 (6.7 GB vs 9.7 GB), so it fits on smaller GPUs. 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 needs less VRAM, AI21 Jamba Reasoning 3B or AFM 4.5B?
At BF16, AI21 Jamba Reasoning 3B needs 6.7 GB and AFM 4.5B needs 9.7 GB, so AI21 Jamba Reasoning 3B is the lighter option to run locally.
- Which has a longer context window, AI21 Jamba Reasoning 3B or AFM 4.5B?
AI21 Jamba Reasoning 3B supports 262,144 tokens and AFM 4.5B supports 65,536 tokens.
- What is the difference between AI21 Jamba Reasoning 3B and AFM 4.5B?
AI21 Jamba Reasoning 3B is a 3.2B 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.