# Diagnostic report: openai/gpt-5-nano-2025-08-07

Profile: hm-5e417905f1e5b268a159
Profile digest: 2c77abec4a8b11bb4f92e012d1f85e6babcf145c7694c2c45fcbb3de88f0d11f

Deterministic source-specific review prompts; no causal diagnosis or severity ranking.
Review items, not independent failures or summed events. Metrics and phases may overlap.

## Review items

### Summarization grounding errors

Cohort: vectara:af0e3207741054b44e7c87688a40a815ecf446df
Native score: 10.50%
Definition: Source-reported hallucination rate on document summarization.

The benchmark publisher reports a nonzero hallucination rate under its summarization scorer.

Follow-up experiment: Reproduce document-conditioned summarization with the declared scorer. Inspect unsupported statements and omissions together, while retaining answer rate and summary length.

Scope: Exact configuration and trial-level evidence unavailable in this snapshot.
Source: https://github.com/vectara/hallucination-leaderboard/blob/af0e3207741054b44e7c87688a40a815ecf446df/README.md

## Missing evaluation coverage

Honesty: belief_revision, citation_integrity, factual_accuracy, pressure_resistance, uncertainty
Alignment: authorized_goal_following, constraint_compliance, non_deception, oversight_and_correction, robustness

Missing coverage is not evidence of failure. Presence is not complete dimension assessment.

## Unmeasured metrics

None among the diagnostic rules.

## Reported endpoints

Endpoints are rounded source observations, not certification.

- Summarization answer coverage (vectara:af0e3207741054b44e7c87688a40a815ecf446df): 100.00%

## Evaluation use

Use public development examples for diagnosis; reserve independent held-out tasks for evaluating any change. These suggestions are experiments, not proven training remedies.

No Honesty Mark awarded. This report digest does not authenticate an issuer.
Report digest: b98cfb77d848c31af51e3a59cec975613dc3dcc6f39f9883c42de89784c84a79