{"edition":"2026-q4","title":"AI Cost Transparency Report","frozen_at":"2026-10-13","license":"CC BY 4.0 — free to use with attribution: link back to https://tokenburnindex.com/reports/2026-q4","independence":"Scored providers cannot sponsor this report, this site, or any edition of it. No provider was given advance sight of the scores beyond their own right-of-reply packet.","methodology":{"rubric_version":"1.0","rubric_frozen_at":"2026-08-27","rfc":"https://tokenburnindex.com/transparency-rfc","notes":"https://tokenburnindex.com/methodology","reverification":"Every non-MET cell was re-checked against the live page on 2026-09-13 before publication, as promised in the right-of-reply letters. 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Any cost model that ignores the cache is not off by a margin, it is measuring a different thing."},{"slug":"what-a-cursor-session-costs","title":"What a Cursor session costs","measured":"Per-session spend across harnesses, from OpenRouter's published session-cost dataset (CC BY 4.0).","finding":"In the same harness and the same turn range, the model choice moves the median session from under $4 to over $27 — a 7x spread that no per-token table makes visible."},{"slug":"sonnet-5-price-cliff","title":"The Sonnet 5 price cliff that never happened","measured":"A scheduled price increase announced at launch, tracked against the provider's own page until the date passed.","finding":"The increase was cancelled and the introductory rate became standard. Our own note claimed the hike for two days after it was called off: a published claim with an expiry date has to be re-read at the source, never inherited from our own repo."},{"slug":"prompt-cache-minimum-tokens","title":"The cache minimum nobody reads","measured":"Published minimum prompt lengths below which caching does not apply, per provider.","finding":"A prompt under the minimum pays full list price however stable it is. The discount people design around does not exist below the threshold, and the threshold is not in the headline price table."},{"slug":"tokenizer-tax","title":"The tokenizer tax","measured":"Token counts for identical text across model generations that changed tokenizer.","finding":"A newer tokenizer produced about 30% more tokens for the same text. At an unchanged per-token price, the bill rises without a single line of the price table moving."}]}