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Reference — CodexHow

The data-led layer underneath the tools and guides: every priced model's specs, capped and curated model-to-model comparisons, migration tables for the version changes that actually matter, and singleton pages covering the batch API, prompt caching, service tiers, rate-limit tiers, sandbox and approval modes, and the long-context repricing rule in full. These pages are short and dense on purpose — a lookup answer padded into paragraphs is slower to use, not more valuable.

Every table on every page here is generated directly from this site's own facts module, never retyped by hand — the same numbers the tools and calculators use, just presented as a direct lookup instead of run through arithmetic.