FITMYLLM · AUGUST 17, 2026 · OPEN METHODOLOGY · COMMUNITY BENCHMARKS
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Quantization Options Select your GPU for speed estimates Quant Bits VRAM @ 2K Quality IQ2_M 2.93 24.7 GB
low Q2_K 3.16 26.6 GB
low IQ3_XXS 3.25 27.3 GB
low IQ3_XS 3.5 29.4 GB
low Q3_K_S 3.64 30.5 GB
low IQ3_M 3.76 31.5 GB
low Q3_K_M 4 33.5 GB
low Q3_K_L 4.3 36.0 GB
moderate IQ4_XS 4.46 37.3 GB
moderate Q4_K_S 4.67 39.0 GB
moderate Q4_K_M 4.89 40.8 GB
good Q5_K_S 5.57 46.4 GB
good Q5_K_M 5.7 47.5 GB
good Q6_K 6.56 54.6 GB
excellent Q8_0 8.5 70.6 GB
lossless FP16 16 132.5 GB
lossless
Select your GPU above to see speed estimates and compatibility for each quantization.
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Run this model IQ2_M — 24.7 GB VRAM Q2_K — 26.6 GB VRAM IQ3_XXS — 27.3 GB VRAM IQ3_XS — 29.4 GB VRAM Q3_K_S — 30.5 GB VRAM IQ3_M — 31.5 GB VRAM Q3_K_M — 33.5 GB VRAM Q3_K_L — 36.0 GB VRAM IQ4_XS — 37.3 GB VRAM Q4_K_S — 39.0 GB VRAM Q4_K_M — 40.8 GB VRAM Q5_K_S — 46.4 GB VRAM Q5_K_M — 47.5 GB VRAM Q6_K — 54.6 GB VRAM Q8_0 — 70.6 GB VRAM FP16 — 132.5 GB VRAM
Ollama llama.cpp vLLM LM Studio KoboldCpp Jan Docker
▸ Easiest way to get started · Beginners
DOCS ↗ curl -fsSL https://ollama.com/install.sh | shCOPY
$ ollama run opt:66b-q4_K_MCOPY
Tag may need adjustment — check ollama.com/library/opt for available tags.
▸ SETUP GUIDE >_
Auto-setup with fitmyllm CLI Detects your GPU, recommends the best model, downloads it, and starts chatting — zero config. Benchmarks your speed and contributes anonymous data to improve predictions.
Auto-detect GPU Live tok/s in chat Speed benchmarks 9 inference engines
GPUs that can run this model At Q4_K_M quantization. Sorted by minimum VRAM.
Find the best GPU for OPT 66B
Build Hardware for OPT 66B Largest OPT. Requires multi-GPU but quality doesn't match modern 13B models.
Read full model card ▸ COLOPHON FITMYLLM · INDEPENDENT · DATA-DRIVEN
FITMYLLM · EST. 2025 · © 2026
RECOMMENDATIONS FROM PUBLISHED MATH, CORRECTED BY THE COMMUNITY — 30.
▸ SPEC SHEET
OPT 66B — 66B Dense. ▸ SPECIFICATIONS
PARAMETERS 66B
ARCHITECTURE Dense Transformer
CONTEXT LENGTH 2K tokens
CAPABILITIES chat
RELEASE DATE 2022-05-03
PROVIDER Meta
FAMILY opt ▸ VRAM REQUIREMENTS
QUANT BPW VRAM QUALITY IQ2_M 2.93 24.7 GB 75% Q2_K 3.16 26.6 GB 78% IQ3_XXS 3.25 27.3 GB 82% IQ3_XS 3.5 29.4 GB 84% Q3_K_S 3.64 30.5 GB 85% IQ3_M 3.76 31.5 GB 86% Q3_K_M 4 33.5 GB 88% Q3_K_L 4.3 36.0 GB 90% IQ4_XS 4.46 37.3 GB 92% Q4_K_S 4.67 39.0 GB 93% Q4_K_M 4.89 40.8 GB 94% Q5_K_S 5.57 46.4 GB 96% Q5_K_M 5.7 47.5 GB 96% Q6_K 6.56 54.6 GB 97% Q8_0 8.5 70.6 GB 100% FP16 16 132.5 GB 100%
§ 03 COMPATIBLE GPUs
30 @ Q4_K_M Feedback 