{
  "_schema": "sipsalabs-pack-feed-v1",
  "_about": "Latest UltraCompress pack drops, ordered by published_at desc. Subscribe via RSS at /feed/rss.xml or Atom at /feed/atom.xml. Updated on every new pack ship.",
  "feed_url": "https://sipsalabs.com/feed/index.json",
  "rss_url": "https://sipsalabs.com/feed/rss.xml",
  "atom_url": "https://sipsalabs.com/feed/atom.xml",
  "updated_at": "2026-05-28T03:00:00Z",
  "total_packs": 23,
  "packs": [
    {
      "model_id": "DINOv2-Large",
      "repo_id": "SipsaLabs/dinov2-large-uc-v3-bpw5",
      "quality_metric": "cls_cosine",
      "quality_value": 0.9988,
      "params": "304M (ViT-L/14)",
      "published_at": "2026-05-27",
      "hf_url": "https://huggingface.co/SipsaLabs/dinov2-large-uc-v3-bpw5",
      "note": "First non-LLM pack. Vision Transformer. Proves codec generalizes beyond text."
    },
    {
      "model_id": "Llama-3.1-70B",
      "repo_id": "SipsaLabs/llama-3.1-70b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00898,
      "params": "70B (dense)",
      "published_at": "2026-05-27",
      "hf_url": "https://huggingface.co/SipsaLabs/llama-3.1-70b-uc-v3-bpw5",
      "note": "Promoted from pending eval. 70B dense at sub-1% drift."
    },
    {
      "model_id": "TinyLlama-1.1B-Chat-v1.0",
      "repo_id": "SipsaLabs/tinyllama-1.1b-chat-v1.0-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00317,
      "params": "1.1B",
      "published_at": "2026-05-27",
      "hf_url": "https://huggingface.co/SipsaLabs/tinyllama-1.1b-chat-v1.0-uc-v3-bpw5",
      "note": "Promoted from pending eval."
    },
    {
      "model_id": "Mamba-2.8B-hf",
      "repo_id": "SipsaLabs/mamba-2.8b-hf-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00593,
      "params": "2.8B (SSM)",
      "published_at": "2026-05-25",
      "hf_url": "https://huggingface.co/SipsaLabs/mamba-2.8b-hf-uc-v3-bpw5",
      "note": "First SSM pack. Architecture-matched comparator."
    },
    {
      "model_id": "Phi-4",
      "repo_id": "SipsaLabs/phi-4-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00506,
      "params": "14.7B",
      "published_at": "2026-05-20",
      "hf_url": "https://huggingface.co/SipsaLabs/phi-4-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Phi-3.5-MoE-instruct",
      "repo_id": "SipsaLabs/phi-3.5-moe-instruct-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00129,
      "params": "42B (MoE)",
      "published_at": "2026-05-20",
      "hf_url": "https://huggingface.co/SipsaLabs/phi-3.5-moe-instruct-uc-v3-bpw5",
      "note": "Tightest MoE result in registry."
    },
    {
      "model_id": "Qwen3-235B-A22B",
      "repo_id": "SipsaLabs/qwen3-235b-a22b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00377,
      "params": "235B (MoE, 22B active)",
      "published_at": "2026-05-20",
      "hf_url": "https://huggingface.co/SipsaLabs/qwen3-235b-a22b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Mixtral-8x22B-v0.1",
      "repo_id": "SipsaLabs/mixtral-8x22b-v0.1-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00611,
      "params": "141B (MoE, 39B active)",
      "published_at": "2026-05-20",
      "hf_url": "https://huggingface.co/SipsaLabs/mixtral-8x22b-v0.1-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Qwen3-1.7B (instruct)",
      "repo_id": "SipsaLabs/qwen3-1.7b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00782,
      "params": "1.7B",
      "published_at": "2026-05-20",
      "hf_url": "https://huggingface.co/SipsaLabs/qwen3-1.7b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Mistral-7B-v0.3",
      "repo_id": "SipsaLabs/mistral-7b-v0.3-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00548,
      "params": "7.2B",
      "published_at": "2026-05-10",
      "hf_url": "https://huggingface.co/SipsaLabs/mistral-7b-v0.3-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Hermes-3-Llama-3.1-405B",
      "repo_id": "SipsaLabs/hermes-3-llama-3.1-405b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00664,
      "params": "405B (dense)",
      "published_at": "2026-05-10",
      "hf_url": "https://huggingface.co/SipsaLabs/hermes-3-llama-3.1-405b-uc-v3-bpw5",
      "note": "Largest dense near-lossless 5-bit result. Single 32 GB consumer GPU."
    },
    {
      "model_id": "Mixtral-8x7B-v0.1",
      "repo_id": "SipsaLabs/mixtral-8x7b-v0.1-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00368,
      "params": "47B (MoE, 13B active)",
      "published_at": "2026-05-10",
      "hf_url": "https://huggingface.co/SipsaLabs/mixtral-8x7b-v0.1-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Phi-3-mini-4k-instruct",
      "repo_id": "SipsaLabs/phi-3-mini-4k-instruct-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00262,
      "params": "3.8B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/phi-3-mini-4k-instruct-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Qwen3-1.7B-Base",
      "repo_id": "SipsaLabs/qwen3-1.7b-base-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00401,
      "params": "1.7B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/qwen3-1.7b-base-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Qwen3-14B",
      "repo_id": "SipsaLabs/qwen3-14b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00403,
      "params": "14B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/qwen3-14b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Yi-1.5-9B",
      "repo_id": "SipsaLabs/yi-1.5-9b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00414,
      "params": "8.8B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/yi-1.5-9b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Qwen3-8B",
      "repo_id": "SipsaLabs/qwen3-8b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.00440,
      "params": "8.0B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/qwen3-8b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Qwen3-0.6B",
      "repo_id": "SipsaLabs/qwen3-0.6b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.0069,
      "params": "0.6B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/qwen3-0.6b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "OLMo-2-0425-1B",
      "repo_id": "SipsaLabs/olmo-2-0425-1b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.0073,
      "params": "1.0B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/olmo-2-0425-1b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "OLMo-2-0425-1B-Instruct",
      "repo_id": "SipsaLabs/olmo-2-0425-1b-instruct-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 0.9998,
      "params": "1.0B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/olmo-2-0425-1b-instruct-uc-v3-bpw5",
      "note": "Sub-baseline (within noise)."
    },
    {
      "model_id": "SmolLM2-1.7B-Instruct",
      "repo_id": "SipsaLabs/smollm2-1.7b-instruct-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.0075,
      "params": "1.7B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/smollm2-1.7b-instruct-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "SmolLM2-1.7B",
      "repo_id": "SipsaLabs/smollm2-1.7b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.0085,
      "params": "1.7B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/smollm2-1.7b-uc-v3-bpw5",
      "note": null
    },
    {
      "model_id": "Llama-3.1-8B",
      "repo_id": "SipsaLabs/llama-3.1-8b-uc-v3-bpw5",
      "quality_metric": "ppl_ratio",
      "quality_value": 1.0125,
      "params": "8.0B",
      "published_at": "2026-05-08",
      "hf_url": "https://huggingface.co/SipsaLabs/llama-3.1-8b-uc-v3-bpw5",
      "note": "Widest PPL drift in registry."
    }
  ]
}