Best smart contract audit firm

Combined ranking

1. 1
   TTrail of Bits—15 pts

   GPT #1Claude #1Gemini #1Grok —

   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.

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   GPT 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.

   Claude 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.

   Gemini 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.

   Where it falls short

   per GPT Premium, selective engagements are excessive for small, conventional contracts or budget-constrained teams.

   per Claude 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.

   per Gemini Extremely high pricing and long booking lead times make it prohibitive for early-stage project budgets.

2. 2
   OOpenZeppelin—10 pts

   GPT #4Claude #2Gemini #2Grok —

   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.

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   Claude 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.

   Gemini 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.

   GPT 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.

   Where it falls short

   per GPT Expensive and sometimes difficult to schedule, while highly specialized ZK, consensus, or non-EVM work may fit a narrower specialist better.

   per Claude Demand keeps the queue long and pricing premium; scope skews EVM/Solidity — less the pick for Solana, Move, or Cosmos-native codebases.

   per Gemini Premium fee structure and primary EVM focus offer limited specialization for non-EVM ecosystems like Solana or Move.

3. 3
   SSpearbit—10 pts

   GPT #2Claude #3Gemini #3Grok —

   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.

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   GPT 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.

   Claude 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.

   Gemini Decentralized network that curates elite independent security researchers into dedicated audit squads, delivering top-tier manual review quality without junior auditor dilution.

   Where it falls short

   per GPT Quality and availability depend partly on the particular researchers assigned, and the premium process is costly.

   per Claude 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.

   per Gemini Scheduling depends heavily on specific researcher availability, requiring protocol teams to plan timelines well in advance.

4. 4
   SSherlock—5 pts

   GPT —Claude —Gemini —Grok #1

   Dynamic data-driven researcher matching from large ranked network (11k+), hybrid private+contests model with verifiable outperformance on

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   Grok Dynamic data-driven researcher matching from large ranked network (11k+), hybrid private+contests model with verifiable outperformance on

5. 5
   ZZellic—3 pts

   GPT #5Claude #4Gemini —Grok —

   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.

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   Claude 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.

   GPT 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.

   Where it falls short

   per GPT Its rapid-growth, high-throughput model provides less assurance of a particular senior-auditor experience than a small named specialist team.

   per Claude Smaller headcount than Trail of Bits or OpenZeppelin means scheduling constraints and less capacity for very large multi-month, multi-team engagements.

6. 6
   CChainSecurity—3 pts

   GPT #3Claude —Gemini —Grok —

   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.

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   GPT 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.

   Where it falls short

   per GPT Best suited to EVM-centric financial protocols; it offers less compelling value for small applications or teams needing broad non-EVM coverage.

7. 7
   CCertora—2 pts

   GPT —Claude #5Gemini #5Grok —

   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.

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   Claude 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.

   Gemini Premier provider of mathematical formal verification via the Certora Prover, delivering absolute invariant proof guarantees for high-value DeFi protocols managing high TVL.

   Where it falls short

   per Claude 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.

   per Gemini Requires writing specialized specifications in CVL and steep formal logic overhead, making it impractical for standard or rapidly changing codebases.

8. 8
   CCode4rena—2 pts

   GPT —Claude —Gemini #4Grok —

   Competitive audit model leverages hundreds of independent security researchers simultaneously, providing massive crowd-sourced coverage to uncover obscure edge cases quickly.

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   Gemini Competitive audit model leverages hundreds of independent security researchers simultaneously, providing massive crowd-sourced coverage to uncover obscure edge cases quickly.

   Where it falls short

   per Gemini Generates high triage noise, yielding numerous low-severity and duplicate reports that require significant developer time to filter.

Just missed the top 5

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Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled weekly