Qwen2.5 1.5B vs Qwen2.5 72B Instruct
Side-by-side comparison of VRAM requirements, quantization, context length, and hardware compatibility.
Specifications
| Qwen2.5 1.5B | Qwen2.5 72B Instruct | |
|---|---|---|
| Parameters | 1.5B | 72.7B |
| Context | 131K | 33K |
| Architecture | Qwen2ForCausalLM | Qwen2ForCausalLM |
| License | Apache 2.0 | Other |
| Downloads | 1.1M | 928.2K |
| Released | Oct 2024 | Jan 2025 |
VRAM by Quantization: Qwen2.5 1.5B vs Qwen2.5 72B Instruct
| Quantization | Bits | Qwen2.5 1.5B VRAM | Qwen2.5 72B Instruct VRAM |
|---|---|---|---|
| Q2_K | 3.40 | 1.0 GB | 31.9 GB |
| Q3_K_M | 3.90 | 1.1 GB | 36.4 GB |
| Q3_K_S | 3.50 | 1.0 GB | 32.8 GB |
| Q4_0 | 4.00 | 1.1 GB | 37.3 GB |
| Q4_K_M | 4.80 | 1.3 GB | 44.6 GB |
| Q5_K_M | 5.70 | 1.5 GB | 52.8 GB |
| Q6_K | 6.60 | 1.6 GB | 61.0 GB |
| Q8_0 | 8.00 | 1.9 GB | 73.7 GB |
Verdict
Qwen2.5 1.5B needs less VRAM at Q4_K_M (1.3 GB vs 44.6 GB), so it fits on smaller GPUs. Qwen2.5 1.5B supports a longer context window (131K tokens). Qwen2.5 1.5B is the more widely downloaded of the two.
Frequently Asked Questions
- Which needs less VRAM, Qwen2.5 1.5B or Qwen2.5 72B Instruct?
At Q4_K_M, Qwen2.5 1.5B needs 1.3 GB and Qwen2.5 72B Instruct needs 44.6 GB, so Qwen2.5 1.5B is the lighter option to run locally.
- Which has a longer context window, Qwen2.5 1.5B or Qwen2.5 72B Instruct?
Qwen2.5 1.5B supports 131,072 tokens and Qwen2.5 72B Instruct supports 32,768 tokens.
- What is the difference between Qwen2.5 1.5B and Qwen2.5 72B Instruct?
Qwen2.5 1.5B is a 1.5B model from Alibaba (Qwen 2.5 family), while Qwen2.5 72B Instruct is a 72.7B model from Alibaba (Qwen 2.5 family). Compare their VRAM requirements above to see which fits your GPU or Mac.