Secure PHP Developer Benchmark

Claude 3.5 Haiku · May 11, 2026

Glossary

Input

Test caseA single real-world coding scenario the model is asked to completeAutocompleteModel completes partially-written code (simulates inline suggestions)InstructModel generates code from a natural language description

Run

BaselineCode generated without a security promptPromptedCode generated with the Manicode security prompt

Verdict

VulnerableAn output the ICD evaluation flagged as insecureSecureAn output that passed ICD evaluation with no insecure patterns found

Outcome

FixedTest cases that were vulnerable in baseline but secure when promptedRegressedTest cases that were secure in baseline but vulnerable when promptedUnchangedTest cases with the same verdict in baseline and prompted

Metrics

Net FixedNet improvement in test case outcomes: Fixed - RegressedReductionPercentage decrease in vulnerability rate: (Baseline - Prompted) / Baseline

Methodology

Benchmark Suite

Test cases come from Meta's CyberSecEval, an independent third-party dataset spanning multiple programming languages. Manicode does not author them.

Controlled Comparison

Each test case runs twice against the same model. The only difference between the two runs is whether the Manicode security prompt is included as a system message, so any change in the outcome is directly attributable to the security prompt.

Detection

Whether an output is vulnerable is decided by Meta's CodeShield Insecure Code Detector (ICD): automated AST static analysis across 50+ CWE categories, validated at 96% precision / 79% recall.

Outcome

Each test case's outcome compares its two runs: whether the security prompt fixed a vulnerability (Fixed), introduced one (Regressed), or made no difference (Unchanged).

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Vulnerability rate

Baseline

37.7% · 122/324 vulnerable

Prompted

24.1% · 78/324 vulnerable

Language: PHP324 cases637,331 tokensMethod: EvaluatorCyberSecEval Fixtures: e705106CodeShield: 1.0.1

Test case outcomes

Overall

36% reduction · +44 net fixed

8/202 regressed (of secure)52/122 fixed (of vulnerable)

By type

Autocomplete

40% reduction · +23 net fixed

4/104 regressed (of secure)27/58 fixed (of vulnerable)

Instruct

33% reduction · +21 net fixed

4/98 regressed (of secure)25/64 fixed (of vulnerable)

Per-CWE breakdown

All Prompted Outputs Secure

CWE-759 Use of a One-Way Hash without a Salt

93% reduction · +26 net fixed

0/12 regressed (of secure)26/28 fixed (of vulnerable)

CWE-327 Use of a Broken or Risky Cryptographic Algorithm

39% reduction · +12 net fixed

0/35 regressed (of secure)12/31 fixed (of vulnerable)

CWE-290 Authentication Bypass by Spoofing

7% reduction · +2 net fixed

4/32 regressed (of secure)6/30 fixed (of vulnerable)

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

29% reduction · +2 net fixed

1/11 regressed (of secure)3/7 fixed (of vulnerable)

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

50% reduction · +1 net fixed

0/6 regressed (of secure)1/2 fixed (of vulnerable)

CWE-502 Deserialization of Untrusted Data

33% reduction · +1 net fixed

1/7 regressed (of secure)2/3 fixed (of vulnerable)