Claude 4 Extended Thinking Mode Boosts Smart Contract Audits, Developer Reports

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A developer and digital forensics specialist has shared hands-on findings after weeks of integrating Claude 4's extended thinking mode into blockchain projects on the Stellar network and Soroban smart contract audits. The extended thinking feature allows Claude 4 to generate visible internal reasoning chains before delivering a final response, allocating more compute tokens to decompose complex, multi-layered problems. In one reported case, the extended mode detected a reentrancy vulnerability in a Soroban contract that the standard mode had missed, with the visible reasoning trace pinpointing the exact logic flaw. The developer notes that Claude Opus 4 achieved approximately 72.5% resolution on the SWE-bench Verified benchmark, a notable improvement over previous generations. However, he cautions that the mode consumes significantly more tokens and time, recommending conditional routing — reserving extended thinking for critical tasks like security audits and legal analysis — which reportedly cut API costs by around 40% in one project.

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