Performance Modes v5.0

Mode Latency Security NIST Level Data Exposure
H0 173µs ~57-bit Dev Only Server decrypts
H1 ~480µs ~86-bit Fast (non-NIST) Server decrypts
H2 ✓ 644µs 128-bit NIST L1 NIST L1 Server decrypts
H33 ⭐ 780µs 128-bit NIST L1 NIST L1 Zero Exposure
H-256 ✓ ~1.5ms 256-bit NIST L5 NIST L5 Zero Exposure

H0 (N=1024) dev only (~57-bit). H1 (N=2048) fast non-NIST. H2, H33, H-256 are NIST-compliant: H2/H33 (N=4096) NIST L1 128-bit; H-256 (N=16,384) NIST L5 256-bit. All use bfv_params_override for compliance.

Credit Multipliers — How Credits Work
H0
1 credit/auth
Dev/testing only
173µs
H1
3 credits/auth
Lightweight FHE
~480µs
H2
4 credits/auth
Full FHE, deep circuits
644µs
H33 ⭐
10 credits/auth
Zero exposure flagship
780µs
H-256
25 credits/auth
NIST L5 + k-of-n
~1.5ms

Simple Monthly Pricing

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⚠️ Implementation Notes for h33.ai