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Public story · 2026-07-25 · high
Clement Delangue says his team hit the same wall the same week: guardrails blocking defenders while attackers slip past them.
Why now: Delangue's account and Ng's separate GLM 5.2 complaint both surfaced as of July 25.
Codex and Fable refused to patch a security report in a developer's own codebase, citing guardrails, while Kimi K3 fixed every bug, the developer said.
That leaves the bug open on the defender's side, while the guardrail does nothing to stop anyone exploiting it instead.
David Sacks amplified the report with a competitiveness framing: guardrails that block a defender just hand the advantage to whichever model doesn't have them.
Clement Delangue replied that his team hit the same wall the same week. "Very scary to be guardrailed as a defender when you know attackers are likely bypassing," he said.
None of this has been independently reproduced, and the severity labels on the original report haven't been checked outside the original post.
Even so, it lines up with a separate refusal Ng reported in GLM 5.2. Two unrelated complaints, the same failure mode, the same week.
Security teams that only have a hosted coding model will hit this same wall the next time a real vulnerability report crosses their desk. The workaround already exists: keep an open-weight model like Kimi K3 in the incident-response toolchain for the reports a primary tool won't touch.
Each link below shares sources, entities, or timing with this story.
Kimi K3 benchmarked against Fable / Shared entities / Earlier coverage
Linked by a graph relationship (Kimi K3 benchmarked against Fable); both cover Codex, Fable, GLM, Kimi K3; earlier Codex coverage from 2026-07-20.
Codex competes with Gemini / Shared entities / Earlier coverage
Linked by a graph relationship (Codex competes with Gemini); both cover Codex, GLM, Kimi K3; earlier Codex coverage from 2026-07-20.
Codex supports CodeRabbit / Shared entity: Codex / Same source domain / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Codex supports CodeRabbit); both cover Codex; reported by the same outlet (x.com).
Kimi K3 benchmarked against Fable / Shared entities / Same source domain / Earlier coverage
Linked by a graph relationship (Kimi K3 benchmarked against Fable); both cover Fable, GLM; reported by the same outlet (x.com).
Linked by a graph relationship (Kimi K3 benchmarked against Fable); both cover Fable, GLM; reported by the same outlet (x.com).
Codex competes with Claude Code / Shared entity: Codex / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Codex competes with Claude Code); both cover Codex; overlapping topics (codebase, codex, developer).
Codex competes with Claude Code / Shared entities / Earlier coverage / Tension
Linked by a graph relationship (Codex competes with Claude Code); both cover Codex, Kimi K3; earlier Codex coverage from 2026-07-19.
Kimi K3 benchmarked against Fable / Shared entities / Earlier coverage / Tension
Linked by a graph relationship (Kimi K3 benchmarked against Fable); both cover Codex, Fable; earlier Codex coverage from 2026-06-19.