Qwen1.5 0.5B Chat vs Qwen3 0.6B
Side-by-side comparison of VRAM requirements, quantization, context length, and hardware compatibility.
Specifications
| Qwen1.5 0.5B Chat | Qwen3 0.6B | |
|---|---|---|
| Parameters | 620M | 752M |
| Context | 33K | 41K |
| Architecture | Qwen2ForCausalLM | Qwen3ForCausalLM |
| License | Other | Apache 2.0 |
| Downloads | 85.9K | 22.5M |
| Released | Apr 2024 | Jul 2025 |
VRAM by Quantization: Qwen1.5 0.5B Chat vs Qwen3 0.6B
| Quantization | Bits | Qwen1.5 0.5B Chat VRAM | Qwen3 0.6B VRAM |
|---|---|---|---|
| Q2_K | 3.40 | 0.8 GB | 0.7 GB |
| Q3_K_M | 3.90 | 0.8 GB | 0.8 GB |
| Q3_K_S | 3.50 | 0.8 GB | 0.8 GB |
| Q4_0 | 4.00 | 0.8 GB | 0.8 GB |
| Q4_K_M | 4.80 | 0.9 GB | 0.9 GB |
| Q5_K_M | 5.70 | 0.9 GB | 0.9 GB |
| Q6_K | 6.60 | 1.0 GB | 1.0 GB |
| Q8_0 | 8.00 | 1.1 GB | 1.2 GB |
Verdict
Qwen3 0.6B supports a longer context window (41K tokens). Qwen3 0.6B is the more widely downloaded of the two.
Frequently Asked Questions
- Which needs less VRAM, Qwen1.5 0.5B Chat or Qwen3 0.6B?
At Q4_K_M, Qwen1.5 0.5B Chat needs 0.9 GB and Qwen3 0.6B needs 0.9 GB, so Qwen1.5 0.5B Chat is the lighter option to run locally.
- Which has a longer context window, Qwen1.5 0.5B Chat or Qwen3 0.6B?
Qwen1.5 0.5B Chat supports 32,768 tokens and Qwen3 0.6B supports 40,960 tokens.
- What is the difference between Qwen1.5 0.5B Chat and Qwen3 0.6B?
Qwen1.5 0.5B Chat is a 620M model from Alibaba (Qwen family), while Qwen3 0.6B is a 752M model from Alibaba (Qwen family). Compare their VRAM requirements above to see which fits your GPU or Mac.