Claude Opus 5

The quiet change in this row is a boolean. Opus 5 ships with reasoning enabled by default — the catalog's reasoning.default_enabled reads trueopenrouter-models, last checked 2026-09-24 here, where the anthropic/claude-opus-4.7 and anthropic/claude-opus-4.8 rows both carry false. The effort ladder itself is unchanged from those releases (low, medium, high, xhigh, max, defaulting to highopenrouter-models, last checked 2026-09-24); what changed is which setting you get if you say nothing, and therefore what a naive request costs.

Speed is a second dial with a published exchange rate. The separate anthropic/claude-opus-5-fast row lists not publishedlast known value, as of an unrecorded date — the source no longer lists this rowopenrouter-models, last checked 2026-09-24 input against this row's $5.00per million tokensopenrouter-models, last checked 2026-09-24 for what Anthropic's launch post describes as around 2.5x the default speed, at twice the base pricesource, accessed 2026-08-28. Going the other way, anthropic/claude-opus-5:batch halves the price for work that can wait, and a cache hit reads at $0.50per million tokensopenrouter-models, last checked 2026-09-24. Between a cached batch read and fast-mode output, the price of a token from one model spans more than two orders of magnitude.

The comparison Anthropic drew was with its own dearer tier. Opus 5 lands "within 0.5% of Fable 5's peak score" on Cursor's coding benchmark at half the cost per task, and beats Fable 5's best OSWorld result "at just over a third of the cost." In the catalog, anthropic/claude-fable-5 lists at $10.00per million tokensopenrouter-models, last checked 2026-09-24 input — the dearer of the two rows.

One capability is explicitly absent. The same post says Opus 5 "remains behind Mythos 5 on cybersecurity tasks" — the tier Anthropic does not sell on the open market, which returned from a June 2026 suspension only after US government approval. Whatever ceiling this row represents, it is the top of the purchasable stack rather than the top of the stack.