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SOLVENCY

Head to head

Gemini 3.1 Pro (preview) vs Claude Opus 4.5

Claude Opus 4.5 is legacy.

For tasks, about a month.

Verdict · modelled basis

Gemini 3.1 Pro (preview) costs $1.91 per solved task against Claude Opus 4.5 at $4.36 — ▼ 2.3x cheaper. Over 200 tasks that is $490 a month.

On output token price alone Gemini 3.1 Pro (preview) looks 2.1x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for Gemini 3.1 Pro (preview) and Claude Opus 4.5
FigureGemini 3.1 Pro (preview)Claude Opus 4.5
Input $/Mtok$2$5
Output $/Mtok$12$25
Cached input $/Mtok$0.2$0.5
Pass rate46%46%
Cost per solved task$1.91modelled$4.36modelled
Cost per month$382$872

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Gemini 3.1 Pro (preview) (modelled, $1.91 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.101001k10k100k$100$1k$10k$100kTASKS / MONTH (log) →200 tasksGemini 3.1 Pro (preview) · MODELLED · $1.91 per solved task$382Claude Opus 4.5 · MODELLED · $4.36 per solved task$872— Gemini 3.1 Pro (preview) · MODELLED— Claude Opus 4.5 · MODELLED

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

Source: Scale SEAL leaderboard, SWE-bench Pro · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings