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Apertus-v1.1-1.5B-Instruct
swiss-ai · open license · released 3 May 2026
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Arena score—Not voted on Arena yet
Size1.5 Bparameters
4-bit download0.9 GBweights only, Q4_K_M
Max context4Ktokens, from the model config
Where to use it for free
- Run it in one command with whichllm (free, open source):
uvx whichllm@latest plan "Apertus-v1.1-1.5B-Instruct"shows the GPU you need,uvx whichllm@latest run "Apertus-v1.1-1.5B-Instruct gguf"downloads it and starts a chat - Download and run it at home: official weights · GGUF files for Ollama and LM Studio
No Arena votes yet
Arena has not voted on this model. It is listed because it is a popular small model on its lab's official Hugging Face page (3K downloads a month).
Speed on popular hardware
| Hardware | GPU memory | Fits? | Speed |
|---|---|---|---|
| RTX 3060 12 GB | 12 GB | Fits in GPU | 124 tok/s |
| RTX 4060 Ti 16 GB | 16 GB | Fits in GPU | 102 tok/s |
| RTX 3090 | 24 GB | Fits in GPU | 269 tok/s |
| RTX 4090 | 24 GB | Fits in GPU | 284 tok/s |
| RTX 5090 | 32 GB | Fits in GPU | 413 tok/s |
| RX 7900 XTX | 24 GB | Fits in GPU | 274 tok/s |
| 2 × RTX 3090 | 48 GB | Fits in GPU | 261 tok/s |
| 4 × RTX 3090 | 96 GB | Fits in GPU | 247 tok/s |
| Mac M4 Max 128 GB | 96 GB | Fits in GPU | 123 tok/s |
| Ryzen AI Max+ 395 128 GB | 96 GB | Fits in GPU | 91 tok/s |
| 8 × H100 SXM | 640 GB | Fits in GPU | 470 tok/s |
Estimate at 4-bit with 32K context, 64 GB of DDR5 for offload. Speed ≈ memory bandwidth × 78% ÷ data read per token, plus a fixed cost per token, calibrated on 44 real llama.cpp tests; typical error about ±10%. Compare all GPUs.
GPU memory needed
| Level | Quality vs full |
|---|---|
| Q3_K_M | +10.5% noticeable loss |
| Q4_K_M | +2.8% small loss |
| Q5_K_M | +0.9% very small loss |
| Q6_K | +0.3% near-lossless |
| Q8_0 | ≈ 0% same as full |
| F16 | ≈ 0% same as full |
Weights + context cache (from the model's architecture) + runtime. Quality: increase in perplexity against the full model, from llama.cpp tests, scaled by model size. Simulate your own setup.
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