DeepSeek R1 Distill Qwen 1.5B vs Qwen3 4B Instruct 2507 Heretic
Side-by-side comparison of VRAM requirements, quantization, context length, and hardware compatibility.
Specifications
| DeepSeek R1 Distill Qwen 1.5B | Qwen3 4B Instruct 2507 Heretic | |
|---|---|---|
| Parameters | 1.8B | 4.0B |
| Context | 131K | 262K |
| Architecture | Qwen2ForCausalLM | Qwen3ForCausalLM |
| License | MIT | Apache 2.0 |
| Downloads | 788.2K | 3.4K |
| Released | Feb 2025 | Nov 2025 |
VRAM by Quantization: DeepSeek R1 Distill Qwen 1.5B vs Qwen3 4B Instruct 2507 Heretic
| Quantization | Bits | DeepSeek R1 Distill Qwen 1.5B VRAM | Qwen3 4B Instruct 2507 Heretic VRAM |
|---|---|---|---|
| Q2_K | 3.40 | 1.1 GB | 2.2 GB |
| Q3_K_M | 3.90 | 1.2 GB | 2.5 GB |
| Q3_K_S | 3.50 | — | 2.3 GB |
| Q4_0 | 4.00 | — | 2.5 GB |
| Q4_K_M | 4.80 | 1.4 GB | 2.9 GB |
| Q5_K_M | 5.70 | 1.6 GB | 3.4 GB |
| Q6_K | 6.60 | 1.8 GB | 3.8 GB |
| Q8_0 | 8.00 | 2.1 GB | 4.5 GB |
Verdict
DeepSeek R1 Distill Qwen 1.5B needs less VRAM at Q4_K_M (1.4 GB vs 2.9 GB), so it fits on smaller GPUs. Qwen3 4B Instruct 2507 Heretic supports a longer context window (262K tokens). DeepSeek R1 Distill Qwen 1.5B is the more widely downloaded of the two.
Frequently Asked Questions
- Which needs less VRAM, DeepSeek R1 Distill Qwen 1.5B or Qwen3 4B Instruct 2507 Heretic?
At Q4_K_M, DeepSeek R1 Distill Qwen 1.5B needs 1.4 GB and Qwen3 4B Instruct 2507 Heretic needs 2.9 GB, so DeepSeek R1 Distill Qwen 1.5B is the lighter option to run locally.
- Which has a longer context window, DeepSeek R1 Distill Qwen 1.5B or Qwen3 4B Instruct 2507 Heretic?
DeepSeek R1 Distill Qwen 1.5B supports 131,072 tokens and Qwen3 4B Instruct 2507 Heretic supports 262,144 tokens.
- What is the difference between DeepSeek R1 Distill Qwen 1.5B and Qwen3 4B Instruct 2507 Heretic?
DeepSeek R1 Distill Qwen 1.5B is a 1.8B model from DeepSeek (Qwen family), while Qwen3 4B Instruct 2507 Heretic is a 4.0B model from p-e-w (Qwen family). Compare their VRAM requirements above to see which fits your GPU or Mac.