Limits RegistryPUBLIC RECORD
Limits RegistryThe Hutter Prize, an ongoing benchmark and cash prize administered since 2006 for compressing a fixed 1 GB Wikipedia text sample (enwik9/enwik8), has driven a steady sequence of record improvements using context-mixing and, more recently, neural-network-based compressors; leading entrants have pushed below roughly 0.9 bits per character on enwik8/enwik9-derived benchmarks. Because the leaderboard changes as new submissions are verified, this should be read as an approximate, actively-moving record rather than a fixed number, and reflects state-of-the-art general-purpose text compression rather than a theoretical limit.
The question, scope, and sources behind this Registry record.
The Hutter Prize, an ongoing benchmark and cash prize administered since 2006 for compressing a fixed 1 GB Wikipedia text sample (enwik9/enwik8), has driven a steady sequence of record improvements using context-mixing and, more recently, neural-network-based compressors; leading entrants have pushed below roughly 0.9 bits per character on enwik8/enwik9-derived benchmarks. Because the leaderboard changes as new submissions are verified, this should be read as an approximate, actively-moving record rather than a fixed number, and reflects state-of-the-art general-purpose text compression rather than a theoretical limit.
The lowest bits-per-character rate achieved by any submitted compressor on the enwik9 benchmark (the first 10^9 bytes of English Wikipedia text) tracked by the ongoing Hutter Prize for lossless text compression.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
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Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-HUTTER-PRIZE-COMPRESSION-RECORD
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Limits Registry. LR-HUTTER-PRIZE-COMPRESSION-RECORD. Best-known lossless compression ratio on a standard large-text benchmark. 2026.