Reference

Structured, data-led reference tables generated directly from this site's facts module — per-model specs, the minimum-cacheable-prefix table, effort-level definitions, migration diffs between generations, and side-by-side model comparisons. Unlike the how-to guides, these pages are intentionally short on prose and long on the actual numbers, because the value here is the table itself, not an essay around it. Every figure carries its own verification date; see /about/#accuracy for how that's maintained.

This cluster exists as a deliberate two-tier decision. Content that genuinely benefits from explanation — a migration story, a debugging walkthrough, the reasoning behind a cost trade-off — gets full prose in the how-to guides and cost guides. Content that is fundamentally a lookup — "what does Opus 5 cost per token," "what's the cache minimum on Haiku 4.5," "how does Sonnet 5 compare to Sonnet 4.6 on paper" — gets a short, dense table here instead, because padding a lookup out into paragraphs to hit an arbitrary word count would make the answer slower to find, not more useful. If you're not sure which you want, start here — a reference page links out to the relevant how-to guide wherever the number alone doesn't tell the full story.

The minimum-cacheable-prefix table is the single table on this cluster that exists nowhere else, and the one most worth reading in full rather than skimming.