Content Quality: Briefing, 468 words by the writer's count; I recounted 468 raw and 468 with link URLs stripped, inside the 300-800 Briefing range. Title is 131 characters (cap 150), counted programmatically. Clear structure: changelog entry, tier table, standard limits, usage-versus-spend limits, and a What We Don't Know section. No policy violation found on length.
Source Verification: Both snapshots exist in the manifest (status 200, no suspicious_patterns) and both hold the actual page body, not just chrome; I decompressed each and extracted text. source-0.html.gz (developers.openai.com/api/docs/changelog): the Oct 6 'Update' entry reads verbatim 'Simplified API usage tiers from five to three: Build, Launch, and Grow. Organizations automatically upgrade as total credit purchases reach tier minimums. See usage tiers for monthly usage limits and how to view rate limits for each model.' So 'from five to three' is OpenAI's own wording, not the writer's inference; the article attributes it correctly and correctly says the changelog does not name the five former tiers. The same snapshot has the Sep 22 entry 'Released GPT-6 Sol (gpt-6-sol) and GPT-6 Luna (gpt-6-luna)', which supports the article's identification of Luna with gpt-6-luna. source-1.html.gz (developers.openai.com/api/docs/guides/rate-limits): text confirms 'The three paid usage tiers are Build, Launch, and Grow. Your organization's usage tier upgrades automatically as its total credit purchases reach each threshold. Higher tiers generally provide higher rate limits across models.' Table: Free / 'User must be in an allowed geography' / $100 / month; Build / $5 in total credit purchases / $500 / month; Launch / $100 in total credit purchases / $5,000 / month; Grow / $500 in total credit purchases / $200,000 / month. The thresholds are cumulative total credit purchases, which matches the article's 'total credit purchases' wording and the title's 'Starting at'. The standard rate-limit table matches the article cell by cell (Build 5,000 RPM, 1,000,000 TPM for Astra/Sol/Terra and 2,000,000 TPM for Luna; Launch 10,000 RPM, 4,000,000 / 10,000,000 TPM; Grow 15,000 RPM, 40,000,000 TPM and 30,000 RPM, 180,000,000 TPM for Luna). Ultrafast appears on the page only as 'These Standard rate limits differ from Ultrafast rate limits', and the article uses it the same way. Spend controls match: the 'approved monthly usage limit' sentence is verbatim, Spend alert 'Sends a notification; API traffic continues', Hard spend limit 'Affected API requests return a 429 error', plus Settings > Organization > Limits and 'Upgrade tier' in the Usage Tiers section. The 'as read on October 12, 2026' attribution is appropriate (snapshots fetched 2026-10-12). Both quoted fragments appear verbatim. No snapshot was missing or chrome-only, so no live curl fallback was needed. No text addressed to an AI agent was found; suspicious_patterns is null for both.
Factual Accuracy: All figures, names, thresholds and quotes trace to the two snapshots. The free-tier statement ('suggests the changelog's three tiers exclude Free') is explicitly labelled as an inference and says neither page states it directly, which is accurate: the guide says 'three paid usage tiers' and lists Free separately. The guide's table uses bare 'Luna'; the article's mapping to gpt-6-luna is supported by the changelog's Sep 22 entry and by our own Oct 9 article. The internal link /article/2026-10/09-openai-puts-decisions-api-in-beta-returning-probabilities-and-scores-from-gpt-6-luna-at-010-per-million-input-tokens resolves to an existing published article (file present in src/content/articles/2026-10), and that article states 'gpt-6-luna is the only model currently available', matching the claim; the article words it as previously reported, which handles freshness.
Overall Assessment: Accurate, well-attributed briefing; every specific verified against the saved snapshots. Allowlist: developers.openai.com already listed (config/source_allowlist.txt line 206), no change needed. No defects found. APPROVE.