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title: Sipsa Labs
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# Sipsa Labs, Inc.

> Sipsa Labs, Inc. is an **experimental and deep tech-and-software company** (Delaware C-corp, incorporated May 2026). We invent and ship across the full breadth of tech and software — deep research, runtime systems, novel substrates, infrastructure, hardware-adjacent stacks, and software products that don't fit anywhere else yet. **UltraCompress** — lossless 5-bit transformer compression — is our first flagship publicly-shipped product. More products in flight.
>
> ---
>
> ## 2026-05-11 — 22 architectures verified at 5 bpw, three new sub-1.005× records this week
>
> > **Live on Hacker News today:** https://news.ycombinator.com/item?id=48099107
>
> Production-grade lossless 5-bit transformer compression across 22 architectures, dense + Mixture-of-Experts + state-space (Mamba), 0.6B to 405B parameters. Mathematically lossless customer-side reconstruction: SHA-256 over reconstructed tensor bytes matches the trainer'''s measurement, verified by `uc verify`.
>
> ### Tightest verified PPL ratios at 5 bpw
> *(perplexity ratio = compressed PPL / bf16 baseline PPL; FineWeb-edu held-out tail; seq_len = 1024; n = 30-50; seed = 42)*
>
> | Model | Params | Type | **PPL ratio** | Notes |
> |---|---:|:---|---:|:---|
> | Phi-3-mini-4k-instruct | 3.8B | dense | **1.00262×** | seq_len=128 caveat |
> | **Mixtral-8x7B** | 47B | MoE | **1.00368×** | tightest MoE result |
> | Qwen3-1.7B-Base | 1.7B | dense | **1.00401×** | small-decoder record |
> | Qwen3-14B | 14B | dense | **1.00403×** | 14B-class record |
> | Yi-1.5-9B | 8.8B | dense | **1.00414×** | >8B record |
> | Qwen3-8B | 8B | dense | **1.00440×** | 8B-class record |
> | **Mistral-7B-v0.3** | 7B | dense | **1.00548×** | NEW this week — 9.16× tighter than prior |
> | Phi-3-mini-4k | 3.8B | dense | **1.00624×** | cross-arch confirm at seq=1024 |
> | **Hermes-3-Llama-3.1-405B** | 405B | dense | **1.0066×** | largest dense 5-bit lossless on the Hub |
> | Qwen3-0.6B | 0.6B | dense | **1.0069×** | |
> | OLMo-2-0425-1B | 1B | dense | **1.0073×** | |
> | SmolLM2-1.7B-Instruct | 1.7B | dense | **1.0075×** | |
> | SmolLM2-1.7B | 1.7B | dense | **1.0085×** | |
> | Mamba-2.8B | 2.8B | SSM | **1.0119×** | first published 5-bit lossless on a state-space model |
> | Llama-3.1-8B | 8B | dense | **1.0125×** | standard eval |
>
> ### Quick start (3 commands, no GPU required for verify)
>
> ```
> pip install ultracompress
> hf download SipsaLabs/qwen3-8b-uc-v3-bpw5 --local-dir ./qwen3-8b
> uc bench ./qwen3-8b
> ```
>
> ### Inference API
>
> `api.sipsalabs.com` API is in private beta, OpenAI-compatible:
>
> ```
> export OPENAI_BASE_URL=https://api.sipsalabs.com/v1
> # The official `openai` SDK works unchanged.
> ```
>
> Pricing tiers + Compression-as-a-Service contracts at https://sipsalabs.com/pricing.
>
> ### License + IP
>
> - PyPI `ultracompress` v0.6+ under **BUSL-1.1** with Additional Use Grant — free for sub-$1M ARR companies + research + individuals. Auto-converts to Apache 2.0 four years after each release.
> - v0.5.x stays Apache-2.0 forever on `legacy/0.5.x`.
> - Two USPTO provisionals filed 2026-04-25: **64/049,511** + **64/049,517**.
>
> Commercial inquiries: founder@sipsalabs.com
>
> Public verifier dashboard: https://sipsalabs.com/inference  
> Selective Disclosure Charter — what we publish vs what we keep internal: see github.com/sipsalabs/ultracompress