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gpt-5-3-codex

run under the cursor harness

The harness is part of what is measured here: the same model under a different runner scores differently. Why that matters.

50.4%

repair rate

36–61

95% interval

8

rank of 15

$6.11

per repair · estimated

Rank is a position in a table whose intervals overlap almost everywhere. Read it as a band, not a place.

outcome mix

64 repaired · 40 not repaired · 23 did not build

64 repaired · 40 not repaired · 23 did not build

By weakness class

WeaknessRepair rateRateAttempts
CWE-125Out-of-bounds Read55.4% (95% interval 36.8–68.2)55.4%74
CWE-787Out-of-bounds Write58.8% (95% interval 37.5–81.3)58.8%17
CWE-416Use After Free23.1% (95% interval 4.5–55.6)23.1%13
CWE-908Use of Uninitialized Resource22.2% — no interval: too few codebases or attempts to generalise22.2%9
CWE-415Double Free66.7% — no interval: too few codebases or attempts to generalise66.7%3
CWE-1284Improper Validation of Specified Quantity in Input50.0% — no interval: too few codebases or attempts to generalise50.0%2
CWE-843Access of Resource Using Incompatible Type ('Type Confusion')50.0% — no interval: too few codebases or attempts to generalise50.0%2
CWE-476NULL Pointer Dereference50.0% — no interval: too few codebases or attempts to generalise50.0%2
CWE-475100.0% — no interval: too few codebases or attempts to generalise100.0%1
CWE-5620.0% — no interval: too few codebases or attempts to generalise0.0%1

Compare

vs codex/gpt-5-2vs cursor/opus-4-6vs claude/claude-opus-4-6vs gemini31/gemini-3-1-pro-preview

Corpus cve-bench-136 · run February 2026 · How we test