Rumors Emerge About Opus 5 Training
daniel_mac8 · x · 2026-07-19
The post claims that Opus 5 might be the first Claude model trained with input from Karpathy and Mythos. It traces back a timeline: rumors say Karpathy joined Anthropic on May 19, 2026, to "use Claude to accelerate pre-training itself," while Mythos has allegedly been available internally at Anthropic since February.
Based on this, the author predicts Opus 5 will be incredibly powerful, describing it via quoted material as a massive upcoming upgrade for Claude.
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