Anthropic: Claude Opus 4.8

Five Opus releases in a row list at the same input price. anthropic/claude-opus-4.1 heads at $15.00per million tokensopenrouter-models, last checked 2026-09-14; the next release lists two thirds below that, at $5.00per million tokensopenrouter-models, last checked 2026-09-14 on anthropic/claude-opus-4.5 — and every release since has matched that new number exactly: $5.00per million tokensopenrouter-models, last checked 2026-09-14 on 4.6, $5.00per million tokensopenrouter-models, last checked 2026-09-14 on 4.7, this row's own $5.00per million tokensopenrouter-models, last checked 2026-09-14, and $5.00per million tokensopenrouter-models, last checked 2026-09-14 on Opus 5. Same number, five times running. Each of those is the top listed provider's rate for its row rather than necessarily Anthropic's own, and the 4.1 row is headed by resellers, so the step down sits between listings rather than being a price Anthropic announced.

Not everything about the row stayed flat over that stretch: what moved was the context window, not the price. anthropic/claude-opus-4.5 still capped at 200000tokensopenrouter-models, last checked 2026-09-14, the same ceiling the line had shipped with since the first Opus 4. The next release, anthropic/claude-opus-4.6, raised it to 1000000tokensopenrouter-models, last checked 2026-09-14, at an unchanged price, and it has held there through this row and Opus 5. Price and context window are two separate dials in this lineup, and they don't turn together.