Ex-Anthropic researcher Coxon says Mythos could be retrained with a fraction of the original compute

Jacob Coxon, a former OpenAI and Anthropic researcher, says a slide from Anthropic's IPO roadshow was a major reason he left the company after about four months. The chart shows the pre-training compute multiplier for code over time on a logarithmic y-axis, and Coxon argues the steep climb from July 2024 to October 2026 points to superexponential algorithmic progress, adding that Anthropic could already retrain its Mythos model with a fraction of the compute originally needed.