# Astra compressed 600Mb of audio into 20Kb > Source: > Published: 2026-09-25 08:15:15+00:00 Astra is a very strong model! I was the most surprised by its solution in Kolmogorov Audio Compression: Instead of writing a compression algorithm, Astra figured out that we had synthesized the audio programmatically and simply reverse engineered the code for it. This way, it was able to compress 600MB+ of audio data into 20KB GPT-6 Astra is the best-performing model on FrontierSWE Astra achieves a score of 65.5%, outperforming Fable 5.1 (56.3%) and its predecessor GPT-5.6 Sol (32.2%)