On Nov. 2, 2026 Anthropic released FlashProve, an open-source research prototype that proves a reply came from a committed set of model weights. For public 4-bit Llama 4 Maverick weights, Anthropic said one H100 produced proofs at 110 tokens per second, with each proof 18.78 MB, on 1,024-token windows under greedy integer decoding. The fast executable code has no formal guarantee, the architecture is not hidden, and the post does not say production Claude traffic is checked.
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