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Head to head

Claude Opus 5vsKimi K3

For tasks, about a month.

Verdict · measured basis

Claude Opus 5 costs $0.10 per solved task against Kimi K3 at $0.16 — ▼ 1.7x cheaper. Over 200 tasks that is $13 a month.

On output token price alone Kimi K3 looks 1.7x cheaper. The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.

Verified pricing, pass rate and cost per solved task for Claude Opus 5 and Kimi K3
FigureClaude Opus 5Kimi K3
Input $/Mtok$5$3
Output $/Mtok$25$15
Cached input $/Mtok$0.5$0.3
Pass rate100%43%
Cost per solved task$0.10measured$0.16measured
Cost per month$19$33

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Claude Opus 5 (measured, $0.10 per solved task), Kimi K3 (measured, $0.16 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$1$10$100$1k$10kTASKS / MONTH (log) →200 tasksClaude Opus 5 · MEASURED · $0.10 per solved task$19Kimi K3 · MEASURED · $0.16 per solved task$33— Claude Opus 5 · MEASURED— Kimi K3 · MEASURED

Solid measured · dashed modeled · dotted stale. The gap is the verdict.

Solvency Bench (solvency.dev) — first-party measurement · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings