Head to head
vs For light moderate heavy
Verdict · measured basis
Claude Opus 5 costs $0.10 per solved task against
GPT-5.6 Terra at $4.50 — ▼ 46x cheaper .
Over 200 tasks that is $881 a month.
On output token price alone GPT-5.6 Terra looks 2.1x 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 Claude Opus 5 and GPT-5.6 Terra Figure Claude Opus 5 GPT-5.6 Terra Input $/Mtok $5 $2 Output $/Mtok $25 $12 Cached input $/Mtok $0.5 $0.2 Pass rate 100% 60% Cost per solved task $0.10 measured $4.50 measured Cost per month $19 $900
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for Claude Opus 5 (measured, $0.10 per solved task), GPT-5.6 Terra (measured, $4.50 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 Claude Opus 5 · MEASURED · $0.10 per solved task $19 Claude Opus 5 MEASURED GPT-5.6 Terra · MEASURED · $4.50 per solved task $900 GPT-5.6 Terra MEASURED Monthly cost against tasks per month Log-log lines for Claude Opus 5 (measured, $0.10 per solved task), GPT-5.6 Terra (measured, $4.50 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 Claude Opus 5 · MEASURED · $0.10 per solved task $19 GPT-5.6 Terra · MEASURED · $4.50 per solved task $900 — Claude Opus 5 · MEASURED — GPT-5.6 Terra · 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