Head to head
vs Claude Opus 4.6 is legacy.
For light moderate heavy
No verdict
One cost is measured and the other is modelled . The two bases are never ranked against each other, so no verdict is given. Each figure is shown on its own basis below.
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Verified pricing, pass rate and cost per solved task for DeepSeek V4 Flash and Claude Opus 4.6 Figure DeepSeek V4 Flash Claude Opus 4.6 Input $/Mtok $0.44 $5 Output $/Mtok $1.32 $25 Cached input $/Mtok $0.014 $0.5 Pass rate 73% 52% Cost per solved task $0.02 measured $3.85 modelled Cost per month $4 $771
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for DeepSeek V4 Flash (measured, $0.02 per solved task), Claude Opus 4.6 (modelled, $3.85 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $1 $10 $100 $1k $10k $100k TASKS / MONTH (log) → 200 tasks DeepSeek V4 Flash · MEASURED · $0.02 per solved task $4 DeepSeek V4 Flash MEASURED Claude Opus 4.6 · MODELED · $3.85 per solved task $771 Claude Opus 4.6 MODELED Monthly cost against tasks per month Log-log lines for DeepSeek V4 Flash (measured, $0.02 per solved task), Claude Opus 4.6 (modelled, $3.85 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $1 $10 $100 $1k $10k $100k TASKS / MONTH (log) → 200 tasks DeepSeek V4 Flash · MEASURED · $0.02 per solved task $4 Claude Opus 4.6 · MODELED · $3.85 per solved task $771 — DeepSeek V4 Flash · MEASURED — Claude Opus 4.6 · MODELED 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