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SOLVENCY

Head to head

Claude Opus 5 vs Grok 4.5

For tasks, about a month.

Verdict · measured basis

Grok 4.5 costs $3.81 per solved task against Claude Opus 5 at $12.01 — ▼ 3.2x cheaper. Over 200 tasks that is $1.6k a month.

On output token price alone Grok 4.5 looks 4.2x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for Claude Opus 5 and Grok 4.5
FigureClaude Opus 5Grok 4.5
Input $/Mtok$5$2
Output $/Mtok$25$6
Cached input $/Mtok$0.5$0.3
Pass rate68%64%
Cost per solved task$12.01measured$3.81measured
Cost per month$2.4k$763

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Grok 4.5 (measured, $3.81 per solved task), Claude Opus 5 (measured, $12.01 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$100$1k$10k$100k$1MTASKS / MONTH (log) →200 tasksGrok 4.5 · MEASURED · $3.81 per solved task$763Claude Opus 5 · MEASURED · $12.01 per solved task$2.4k— Grok 4.5 · MEASURED— Claude Opus 5 · MEASURED

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

Source: Artificial Analysis (artificialanalysis.ai) · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings