Head to head
vs For light moderate heavy
Verdict · measured basis
GPT-5.6 Sol costs $0.0095 per solved task against
DeepSeek V4 Flash at $0.02 — ▼ 2.0x cheaper .
Over 200 tasks that is $2 a month.
On output token price alone DeepSeek V4 Flash looks 23x cheaper. The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.
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Verified pricing, pass rate and cost per solved task for GPT-5.6 Sol and DeepSeek V4 Flash Figure GPT-5.6 Sol DeepSeek V4 Flash Input $/Mtok $5 $0.44 Output $/Mtok $30 $1.32 Cached input $/Mtok $0.5 $0.014 Pass rate 100% 73% Cost per solved task $0.0095 measured $0.02 measured Cost per month $2 $4
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for GPT-5.6 Sol (measured, $0.0095 per solved task), DeepSeek V4 Flash (measured, $0.02 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $0.1 $1 $10 $100 $1k TASKS / MONTH (log) → 200 tasks GPT-5.6 Sol · MEASURED · $0.0095 per solved task $2 GPT-5.6 Sol MEASURED DeepSeek V4 Flash · MEASURED · $0.02 per solved task $4 DeepSeek V4 Flash MEASURED Monthly cost against tasks per month Log-log lines for GPT-5.6 Sol (measured, $0.0095 per solved task), DeepSeek V4 Flash (measured, $0.02 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $0.1 $1 $10 $100 $1k TASKS / MONTH (log) → 200 tasks GPT-5.6 Sol · MEASURED · $0.0095 per solved task $2 DeepSeek V4 Flash · MEASURED · $0.02 per solved task $4 — GPT-5.6 Sol · MEASURED — DeepSeek V4 Flash · 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