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Head to head

GPT-5.6 SolvsStep 3.5 Flash

For tasks, about a month.

Verdict · measured basis

Step 3.5 Flash costs $0.0031 per solved task against GPT-5.6 Sol at $0.0095 — ▼ 3.0x cheaper. Over 200 tasks that is $1 a month.

On output token price alone Step 3.5 Flash looks 100x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5.6 Sol and Step 3.5 Flash
FigureGPT-5.6 SolStep 3.5 Flash
Input $/Mtok$5$0.1
Output $/Mtok$30$0.3
Cached input $/Mtok$0.5$0.1
Pass rate100%50%
Cost per solved task$0.0095measured$0.0031measured
Cost per month$2$0.62

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Step 3.5 Flash (measured, $0.0031 per solved task), GPT-5.6 Sol (measured, $0.0095 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$0.1$1$10$100$1kTASKS / MONTH (log) →200 tasksStep 3.5 Flash · MEASURED · $0.0031 per solved task$0.62GPT-5.6 Sol · MEASURED · $0.0095 per solved task$2— Step 3.5 Flash · MEASURED— GPT-5.6 Sol · 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