Head to head
vs Claude Opus 4.5 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 GPT-5.6 Sol and Claude Opus 4.5 Figure GPT-5.6 Sol Claude Opus 4.5 Input $/Mtok $5 $5 Output $/Mtok $30 $25 Cached input $/Mtok $0.5 $0.5 Pass rate 100% 46% Cost per solved task $0.0095 measured $4.36 modelled Cost per month $2 $872
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), Claude Opus 4.5 (modelled, $4.36 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 $10k $100k TASKS / MONTH (log) → 200 tasks GPT-5.6 Sol · MEASURED · $0.0095 per solved task $2 GPT-5.6 Sol MEASURED Claude Opus 4.5 · MODELED · $4.36 per solved task $872 Claude Opus 4.5 MODELED Monthly cost against tasks per month Log-log lines for GPT-5.6 Sol (measured, $0.0095 per solved task), Claude Opus 4.5 (modelled, $4.36 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 $10k $100k TASKS / MONTH (log) → 200 tasks GPT-5.6 Sol · MEASURED · $0.0095 per solved task $2 Claude Opus 4.5 · MODELED · $4.36 per solved task $872 — GPT-5.6 Sol · MEASURED — Claude Opus 4.5 · 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