DavidAU · text · mixture of experts

OpenAI-gpt-oss-20B-Claude-4.5-Opus-Heretic-Uncensored

DavidAU/OpenAI-gpt-oss-20B-Claude-4.5-Opus-Heretic-Uncensored

OpenAI-gpt-oss-20B-Claude-4.5-Opus-Heretic-Uncensored at I1-IQ1_S is exactly 12,016,855,104 bytes (11.19 GiB / 12.02 GB) — an effective 4.596 bits per weight, not the nominal 1. Its KV cache at 32K is 0.77 GiB, not the 1.50 GiB a flat formula predicts.

From the file· summed from 1 file(s)From the file· KV per layer
Parameters
20.9B
total, not active
Architecture
gpt-oss
24 layers
Context
131,072
native (config.json)
License
apache-2.0

Shipped quantizations

exact bytes, summed from published files
QuantSizeExact bytesEffective bpwTensorsPublisher
I1-IQ1_S11.19 GiB12,016,855,1044.596mradermacher
I1-IQ1_S11.19 GiB12,016,855,1044.596fairy322
I1-IQ2_XXS11.19 GiB12,016,855,1044.596fairy322
I1-IQ1_M11.19 GiB12,016,855,1044.596mradermacher
I1-IQ1_M11.19 GiB12,016,855,1044.596fairy322
I1-IQ2_XXS11.19 GiB12,016,855,1044.596mradermacher
I1-IQ2_XS11.20 GiB12,025,702,4644.600fairy322
I1-IQ2_XS11.20 GiB12,025,702,4644.600mradermacher
I1-Q3_K_S11.23 GiB12,061,091,9044.613fairy322
I1-Q3_K_S11.23 GiB12,061,091,9044.613mradermacher
I1-IQ2_M11.24 GiB12,065,515,5844.615mradermacher
I1-IQ3_XS11.24 GiB12,065,515,5844.615fairy322
I1-IQ3_XS11.24 GiB12,065,515,5844.615mradermacher
I1-IQ2_S11.24 GiB12,065,515,5844.615mradermacher
I1-IQ2_S11.24 GiB12,065,515,5844.615fairy322
I1-Q2_K11.24 GiB12,065,515,5844.615fairy322
I1-IQ3_S11.24 GiB12,065,515,5844.615mradermacher
I1-IQ2_M11.24 GiB12,065,515,5844.615fairy322
I1-IQ3_XXS11.24 GiB12,065,515,5844.615mradermacher
I1-IQ3_S11.24 GiB12,065,515,5844.615fairy322
I1-IQ3_XXS11.24 GiB12,065,515,5844.615fairy322
I1-Q2_K11.24 GiB12,065,515,5844.615mradermacher
I1-IQ4_XS11.27 GiB12,096,481,3444.627fairy322
I1-IQ4_XS11.27 GiB12,096,481,3444.627mradermacher
I1-Q2_K_S11.30 GiB12,136,294,4644.642fairy322
I1-Q2_K_S11.30 GiB12,136,294,4644.642mradermacher
I1-Q4_011.31 GiB12,148,459,5844.647fairy322
I1-Q4_011.31 GiB12,148,459,5844.647mradermacher
I1-IQ3_M11.36 GiB12,202,649,6644.668mradermacher
I1-IQ3_M11.36 GiB12,202,649,6644.668fairy322
I1-Q3_K_M12.03 GiB12,916,152,3844.941mradermacher
I1-Q3_K_M12.03 GiB12,916,152,3844.941fairy322
I1-Q3_K_L12.42 GiB13,335,111,7445.101mradermacher
I1-Q3_K_L12.42 GiB13,335,111,7445.101fairy322
I1-Q4_112.45 GiB13,369,095,7445.114mradermacher
I1-Q4_112.45 GiB13,369,095,7445.114fairy322
Q4_K_S13.65 GiB14,654,226,5605.605Lachhhhhhh
I1-Q4_K_S13.65 GiB14,654,243,9045.605fairy322
I1-Q4_K_S13.65 GiB14,654,243,9045.605mradermacher
I1-Q4_K_M14.72 GiB15,805,137,9846.045fairy322

KV cache by context

computed per layer — this model uses sliding-window attention
ContextKV cache (f16)Flat formulaOverstated byFull / windowed / recurrent
4,0960.11 GiB0.19 GiB1.68×12 / 12 / 0
8,1920.21 GiB0.38 GiB1.83×12 / 12 / 0
16,3840.39 GiB0.75 GiB1.91×12 / 12 / 0
32,7680.77 GiB1.50 GiB1.95×12 / 12 / 0
65,5361.52 GiB3.00 GiB1.98×12 / 12 / 0
131,0723.02 GiB6.00 GiB1.99×12 / 12 / 0

12 of 24 layers cache only a 128-token window rather than the full context, on a period of . Figures assume the default configuration; --swa-full disables the saving entirely.

Compare with

same modality, comparable size

Will it run on your card?

full quant x context sweep

Why other calculators give a different number

A parameters × bits ÷ 8 estimate puts I1-IQ1_S at roughly 10.96 GiB. The real file is 11.19 GiB, because a quantization is a mixture and some tensors are always kept at higher precision. The larger discrepancy is the cache: a flat formula gives 1.50 GiB at 32K context where the real figure is 0.77 GiB, because most of this model's layers cache a fixed window rather than the whole context.

Architecture

from config.json
Layers
24
Attention heads
64
KV heads
8
Head dim
64
Hidden size
2880
Vocab
201,088
Sliding window
128
SWA period
MLA
no
Experts
32
Experts per token
4
use_sliding_window

Questions people ask

How much VRAM does OpenAI-gpt-oss-20B-Claude-4.5-Opus-Heretic-Uncensored need?
I1-IQ1_S is exactly 12,016,855,104 bytes (11.19 GiB) in weights. Add the KV cache, which depends on your context length, plus roughly half a gigabyte of runtime overhead.
How large is OpenAI-gpt-oss-20B-Claude-4.5-Opus-Heretic-Uncensored's KV cache?
0.77 GiB at 32K context with an f16 cache, computed per layer. Quantizing the cache to q8_0 roughly halves it, which is often the difference between a context length fitting and not.
Is OpenAI-gpt-oss-20B-Claude-4.5-Opus-Heretic-Uncensored a mixture-of-experts model?
Yes — 32 experts, 4 routed per token. Every expert must be resident, but only the routed ones are read per token, which is why its memory requirement and its speed behave very differently.
Which quantization of OpenAI-gpt-oss-20B-Claude-4.5-Opus-Heretic-Uncensored should I use?
Q4_K_M is the usual default. Pick the largest quantization that fits your card at the context you actually need — the table above gives exact sizes for every one published.