{"slug":"best-smart-contract-audit-firm","title":"Best smart contract audit firm","question":"What are the best smart contract audit firms in 2026?","verdict":"As of 2026-07-19, ChatGPT, Claude, Gemini and Grok collectively rank Trail of Bits #1 for smart contract audit firm on ModelsAgree. The models' case: Best overall for high-stakes, technically novel systems: exceptional cryptography, formal methods, fuzzing, protocol-design review, and open-source tooling such as…. The models' main caveat: Premium, selective engagements are excessive for small, conventional contracts or budget-constrained teams.. The strongest alternative is OpenZeppelin — Audit arm sits next to the team that writes the contract libraries most protocols build on, giving unmatched context on upgradeability, proxy, and…. Not unanimous: Grok picks Sherlock. Source: https://modelsagree.com/best/best-smart-contract-audit-firm (modelsagree.com, CC BY 4.0).","category":"Crypto","url":"https://modelsagree.com/best/best-smart-contract-audit-firm","updated":"2026-07-19","models":["ChatGPT","Claude","Gemini","Grok"],"consensus":"3 of 4 models rank Trail of Bits the top pick","disagreement":"Grok picks Sherlock","combined":[{"rank":1,"product":"Trail of Bits","domain":null,"score":15,"appearances":3,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":1},"reason":"Best overall for high-stakes, technically novel systems: exceptional cryptography, formal methods, fuzzing, protocol-design review, and open-source tooling such as Slither, Echidna, and Medusa; assumes the client values depth over speed or price."},{"rank":2,"product":"OpenZeppelin","domain":null,"score":10,"appearances":3,"modelRanks":{"ChatGPT":4,"Claude":2,"Gemini":2},"reason":"Audit arm sits next to the team that writes the contract libraries most protocols build on, giving unmatched context on upgradeability, proxy, and access-control pitfalls; long public track record auditing high-value systems (major L2s, governance, bridges) with clear, well-written reports."},{"rank":3,"product":"Spearbit","domain":null,"score":10,"appearances":3,"modelRanks":{"ChatGPT":2,"Claude":3,"Gemini":3},"reason":"Near-tie for first; its curated researcher network and lead-reviewer model assemble unusually strong specialists for complex DeFi, L1/L2, bridge, and ZK work, with excellent researcher-to-project matching."},{"rank":4,"product":"Sherlock","domain":null,"score":5,"appearances":1,"modelRanks":{"Grok":1},"reason":"Dynamic data-driven researcher matching from large ranked network (11k+), hybrid private+contests model with verifiable outperformance on"},{"rank":5,"product":"Zellic","domain":null,"score":3,"appearances":2,"modelRanks":{"ChatGPT":5,"Claude":4},"reason":"Founded by top CTF players (perfect blue) and it shows in exploit-oriented depth; strong across EVM plus the harder-to-staff ecosystems (Move/Aptos/Sui, Solana, ZK circuits); reports are concrete and reproduction-focused, and the firm has credible public vuln research beyond paid audits."},{"rank":6,"product":"ChainSecurity","domain":null,"score":3,"appearances":1,"modelRanks":{"ChatGPT":3},"reason":"Outstanding manual reasoning about DeFi economics, invariants, accounting, governance, and upgrade behavior, backed by deep experience reviewing systemically important protocols and unusually clear public reports."},{"rank":7,"product":"Certora","domain":null,"score":2,"appearances":2,"modelRanks":{"Claude":5,"Gemini":5},"reason":"The formal verification specialist — Certora Prover checks custom invariants against the actual bytecode/spec, catching state-machine and invariant bugs manual review can miss; the standard complement for high-TVL DeFi (Aave, Compound-lineage protocols) where \"no path violates solvency\" matters more than a findings list."},{"rank":8,"product":"Code4rena","domain":null,"score":2,"appearances":1,"modelRanks":{"Gemini":4},"reason":"Competitive audit model leverages hundreds of independent security researchers simultaneously, providing massive crowd-sourced coverage to uncover obscure edge cases quickly."}],"perModel":{"ChatGPT":[{"rank":1,"product":"Trail of Bits","reason":"Best overall for high-stakes, technically novel systems: exceptional cryptography, formal methods, fuzzing, protocol-design review, and open-source tooling such as Slither, Echidna, and Medusa; assumes the client values depth over speed or price.","fix":"Premium, selective engagements are excessive for small, conventional contracts or budget-constrained teams."},{"rank":2,"product":"Spearbit","reason":"Near-tie for first; its curated researcher network and lead-reviewer model assemble unusually strong specialists for complex DeFi, L1/L2, bridge, and ZK work, with excellent researcher-to-project matching.","fix":"Quality and availability depend partly on the particular researchers assigned, and the premium process is costly."},{"rank":3,"product":"ChainSecurity","reason":"Outstanding manual reasoning about DeFi economics, invariants, accounting, governance, and upgrade behavior, backed by deep experience reviewing systemically important protocols and unusually clear public reports.","fix":"Best suited to EVM-centric financial protocols; it offers less compelling value for small applications or teams needing broad non-EVM coverage."},{"rank":4,"product":"OpenZeppelin","reason":"Combines strong audits with unmatched practical knowledge of Solidity standards, upgradeability, access control, governance, and the widely used OpenZeppelin Contracts stack; especially valuable when architecture and operational security matter alongside code defects.","fix":"Expensive and sometimes difficult to schedule, while highly specialized ZK, consensus, or non-EVM work may fit a narrower specialist better."},{"rank":5,"product":"Zellic","reason":"Strong offensive-security culture, fast execution, broad EVM plus Move/Sui and ZK capability, extensive public work, and effective use of fuzzing, static analysis, and formal techniques make it a strong merit-to-turnaround choice.","fix":"Its rapid-growth, high-throughput model provides less assurance of a particular senior-auditor experience than a small named specialist team."}],"Claude":[{"rank":1,"product":"Trail of Bits","reason":"Deepest bench of low-level security engineers of any firm in the space; audits span Solidity, Rust/Solana, Move, and node/client code, backed by public tooling (Slither, Echidna, Medusa) that the whole industry depends on — a strong signal the expertise is real rather than marketed; consistently rigorous public reports with findings other firms miss.","fix":"Expensive with long lead times, and overkill for a small team shipping a fork of well-audited code; not the cheapest path to a \"we got audited\" badge."},{"rank":2,"product":"OpenZeppelin","reason":"Audit arm sits next to the team that writes the contract libraries most protocols build on, giving unmatched context on upgradeability, proxy, and access-control pitfalls; long public track record auditing high-value systems (major L2s, governance, bridges) with clear, well-written reports.","fix":"Demand keeps the queue long and pricing premium; scope skews EVM/Solidity — less the pick for Solana, Move, or Cosmos-native codebases."},{"rank":3,"product":"Spearbit","reason":"Marketplace model assembles bespoke teams of top independent researchers (many ex-top-5-firm leads and elite contest performers) matched to the exact protocol type, so you get specialist depth (e.g., perp DEX or restaking expertise) a generalist firm can't guarantee; Cantina adds competitive-review coverage on top of the private engagement.","fix":"Quality varies with which researchers you land — it's a curation layer, not a single accountable bench, so outcomes depend on team composition and a strong internal point of contact to manage the engagement."},{"rank":4,"product":"Zellic","reason":"Founded by top CTF players (perfect blue) and it shows in exploit-oriented depth; strong across EVM plus the harder-to-staff ecosystems (Move/Aptos/Sui, Solana, ZK circuits); reports are concrete and reproduction-focused, and the firm has credible public vuln research beyond paid audits.","fix":"Smaller headcount than Trail of Bits or OpenZeppelin means scheduling constraints and less capacity for very large multi-month, multi-team engagements."},{"rank":5,"product":"Certora","reason":"The formal verification specialist — Certora Prover checks custom invariants against the actual bytecode/spec, catching state-machine and invariant bugs manual review can miss; the standard complement for high-TVL DeFi (Aave, Compound-lineage protocols) where \"no path violates solvency\" matters more than a findings list.","fix":"Not a substitute for a manual audit — value depends on how good your written specs are, and the spec-writing effort is significant; wrong choice as your only audit or for teams without time to invest in formal specs."}],"Gemini":[{"rank":1,"product":"Trail of Bits","reason":"Unmatched research depth in low-level protocol security, cryptography, and open-source tooling (Slither, Echidna); sets the benchmark for high-assurance protocol defense. Near-tie with OpenZeppelin for top rank based on deep technical rigor.","fix":"Extremely high pricing and long booking lead times make it prohibitive for early-stage project budgets."},{"rank":2,"product":"OpenZeppelin","reason":"Deepest domain mastery of EVM standards and secure smart contract architecture, drawing direct expertise from maintaining the web3 ecosystem's foundational contract libraries. Near-tie with Trail of Bits.","fix":"Premium fee structure and primary EVM focus offer limited specialization for non-EVM ecosystems like Solana or Move."},{"rank":3,"product":"Spearbit","reason":"Decentralized network that curates elite independent security researchers into dedicated audit squads, delivering top-tier manual review quality without junior auditor dilution.","fix":"Scheduling depends heavily on specific researcher availability, requiring protocol teams to plan timelines well in advance."},{"rank":4,"product":"Code4rena","reason":"Competitive audit model leverages hundreds of independent security researchers simultaneously, providing massive crowd-sourced coverage to uncover obscure edge cases quickly.","fix":"Generates high triage noise, yielding numerous low-severity and duplicate reports that require significant developer time to filter."},{"rank":5,"product":"Certora","reason":"Premier provider of mathematical formal verification via the Certora Prover, delivering absolute invariant proof guarantees for high-value DeFi protocols managing high TVL.","fix":"Requires writing specialized specifications in CVL and steep formal logic overhead, making it impractical for standard or rapidly changing codebases."}],"Grok":[{"rank":1,"product":"Sherlock","reason":"Dynamic data-driven researcher matching from large ranked network (11k+), hybrid private+contests model with verifiable outperformance on","fix":null}]},"missedByModel":{"ChatGPT":[{"product":"Sigma Prime","reason":"excellent Ethereum, consensus, Rust, and DeFi expertise, but narrower for the typical cross-chain application team"},{"product":"Sherlock","reason":"strong tailored reviews and competitive-audit coverage, but its marketplace/contest model is less consistently comparable to a dedicated top-tier firm engagement"}],"Claude":[{"product":"ChainSecurity","reason":"excellent EVM rigor and strong record with L1/L2 core teams — near-tie with Zellic, edged out on multi-chain breadth"}],"Gemini":[{"product":"Sherlock","reason":"combines competitive audits with protocol coverage, but auditing depth varies based on contest participant pools"},{"product":"Consensys Diligence","reason":"provides strong EVM security expertise and analysis tools, but lacks the crowd coverage of competitive contest models"}]}}