SIPSA.
UltraCompress live · pip install ultracompress && uc try sipsa-qwen3-0.6b

Verified AI infrastructure for regulated deployment.

Sipsa Labs builds the cryptographic primitives that prove the AI model running in production is the model that was validated.

Our flagship product is UltraCompress — 5-bit model compression at near-lossless quality (~1% perplexity cost), with reproducible, cryptographically verifiable reconstruction. Sipsa Inference serves the catalog at api.sipsalabs.com — OpenAI-compatible, drop-in. Patents pending.

Get an API key in 60 s — $5 free, no card → Try it live, no signup Verified benchmarks
1.0066× Hermes-3-405B PPL ratio · single 32 GB GPU
SHA-256 Reproducible reconstruction · uc verify
23 architectures verified · 22 PPL (17 dense + 4 MoE + 1 SSM) + 1 ViT cosine
OpenAI-compatible api.sipsalabs.com/v1 · drop-in openai SDK

20,000+ all-time across all platforms (PyPI + Hugging Face + GitHub) · 469 unique GitHub cloners (last 14 d) · $0 paid acquisition · Built solo, in public

prompt 
Write a haiku about model compression.
qwen3-8b-uc-v3-bpw5 · 5 bits/weight · SHA-256 verified 
Bytes folded inward—
Five bits hold what sixteen knew,
Hash unchanged on disk.
Run your own prompt against a live compressed model →
/ products

Two products live. More in research.

Flagship · Shipping · 23 verified architectures (22 PPL + 1 ViT cosine)

UltraCompress

5-bit transformer compression at near-lossless quality + OpenAI-compatible inference

~3× smaller weights (16-bit → ~5 bits/weight) at the same task quality, with reproducible reconstruction you can verify on your own hardware. Headline record: Hermes-3-Llama-3.1-405B at 1.0066× perplexity ratio on a single 32 GB consumer GPU. Same OpenAI SDK, just change the base URL. Need zero loss? A separate genuinely lossless archival tier reconstructs the original weights bit-for-bit.

Visit product /ultracompress → Try it live live playground → API access $5 free credit, no card → Install pip install ultracompress · PyPI ↑ Stack PyTorch · CUDA · safetensors · HF Hub
Live · Managed API · OpenAI-compatible

Sipsa Inference

Managed serving for compressed transformers — same OpenAI SDK, just change the base URL

OpenAI-compatible inference API at api.sipsalabs.com/v1 — 23 verified architectures (22 PPL-verified: 17 dense + 4 MoE + 1 SSM; + 1 ViT cosine-verified) in the catalog (Hermes-3-405B included on the top tiers). Self-serve from $20/mo (Pro) to $200/mo (Max 20×), plus a $25/seat Team tier, with reserved capacity. $5 free credit, no card.

Try it $5 free credit, no card → Pricing Pro $20 / Max from $100 → Full portfolio All Sipsa Labs products →
/ research

What we've shipped.

23 architectures across 4 classes View matrix → 405B largest verified architecture · Hermes-3-405B at 1.0066× View benchmarks → SHA-256 Reproducible reconstruction Read the contract → Open All artifacts on Hugging Face Browse org ↑

Notes and write-ups: /blog

/ company

A parent company for verified AI infrastructure.

Sipsa Labs is a deep-tech company building verified AI infrastructure for regulated deployment — the cryptographic proof that the model in production is the one you validated. UltraCompress is the current wedge: our flagship product, served via the Sipsa Inference API, with contract compression available for custom architectures. We publish verifiable benchmarks and document failures alongside wins. See the full portfolio →

The SIP inside Sipsa stands for what the company optimizes for: Systems · Intelligence · Precision.

Careers (Cofounder) → Security → Privacy → Press kit → Contact founder →