Edition 10.9 — The refresh edition. Two Anthropic models shipped since the last capture — Sonnet 5 on June 30, Opus 5 on July 24 — and one of them broke the rule this site's tier list was built on: for as long as these leaderboards have existed, the most capable model was also the priciest. Not any more. Opus 5 took the top of the independent index at LOWER cost per task than the model below it. Every board on Ch 24 is re-captured, the vendor cards now show the public leaderboard beside the launch claim, and there is a new two-page model file on the model itself — with the part most coverage skipped: the launch table runs at max effort, the API default is high, and on debugging the expensive setting scores lower.

The refresh edition. Two Anthropic models shipped since the last capture — Sonnet 5 on June 30, Opus 5 on July 24 — and one of them broke the rule this site's tier list was built on: for as long as these leaderboards have existed, the most capable model was also the priciest. Not any more. Opus 5 took the top of the independent index at LOWER cost per task than the model below it. Every board on…