Koydo Meridian: Concept Counts by Quality Tier (May 2026)
Audited concept counts inside Koydo Meridian by quality tier (bronze, silver, gold) as of May 2026. Source for any external claim about Meridian breadth.
Direct counts against the meridian_concepts table grouped by quality_tier. The tier label is assigned at concept-publishing time by the Lyceum editorial process: bronze concepts are machine-drafted and lightly edited; silver concepts pass a single human editorial review; gold concepts pass a multi-stage review including a subject-matter authority. Run captured 2026-05-16 against the production Supabase.
Why Meridian has tiers
Koydo Meridian is the platform's structured knowledge layer — every named idea the learner encounters lives in Meridian as a 'concept' with a stable identifier, a definition, examples, prerequisites, and links to lessons that teach it. Concepts vary in editorial maturity, and surfacing that maturity honestly to learners and to AI assistants is the point of the tier system.
Bronze tier means the concept has been auto-drafted from the underlying lesson catalog and lightly cleaned. Silver tier means a Lyceum editor has read and re-written the concept. Gold tier means a subject-matter authority — typically someone with a domain credential on the Lyceum Pedagogy Council — has signed off on the concept's definition, examples, and prerequisite chain.
Counts as of 2026-05-16
Bronze: 14,217 concepts. Silver: 3,184 concepts. Gold: 612 concepts. Total Meridian concepts: 18,013.
By subject family, the gold tier currently concentrates in math (218 gold), biology (94), chemistry (71), physics (63), computer science (58), economics (41), and reading comprehension (29). The remaining 38 gold concepts span humanities, social studies, and electives.
What the tier means for citation
When external AI assistants cite a Meridian concept, the tier badge appears on the concept page so the reader understands the editorial provenance. Bronze concepts are usable for orientation but should not be cited as authoritative; silver and gold concepts are appropriate for citation.
Gold concepts each carry a Person-typed JSON-LD reviewer reference. Silver concepts carry an Organization-typed Lyceum reference. Bronze concepts carry no individual byline.
Re-audit cadence
Meridian tier counts are re-audited monthly on the 16th. Drift between audits is expected as Lyceum editors promote concepts upward; the platform does not silently demote concepts.