Head to head
vs ST For light moderate heavy
Verdict · measured basis
Step 3.5 Flash costs $0.0031 per solved task against
GLM 5.3 Flash at $0.0033 — ▼ 1.1x cheaper .
Over 200 tasks that is $0.04 a month.
On output token price alone GLM 5.3 Flash looks 1.2x 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 GLM 5.3 Flash and Step 3.5 Flash Figure GLM 5.3 Flash Step 3.5 Flash Input $/Mtok $0.075 $0.1 Output $/Mtok $0.25 $0.3 Cached input $/Mtok $0.015 $0.1 Pass rate 50% 50% Cost per solved task $0.0033 measured $0.0031 measured Cost per month $0.67 $0.62
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for Step 3.5 Flash (measured, $0.0031 per solved task), GLM 5.3 Flash (measured, $0.0033 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 TASKS / MONTH (log) → 200 tasks Step 3.5 Flash · MEASURED · $0.0031 per solved task $0.62 Step 3.5 Flash MEASURED GLM 5.3 Flash · MEASURED · $0.0033 per solved task $0.67 GLM 5.3 Flash MEASURED Monthly cost against tasks per month Log-log lines for Step 3.5 Flash (measured, $0.0031 per solved task), GLM 5.3 Flash (measured, $0.0033 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 TASKS / MONTH (log) → 200 tasks Step 3.5 Flash · MEASURED · $0.0031 per solved task $0.62 GLM 5.3 Flash · MEASURED · $0.0033 per solved task $0.67 — Step 3.5 Flash · MEASURED — GLM 5.3 Flash · MEASURED Solid measured · dashed modeled · dotted stale. The gap is the verdict.
Solvency Bench (solvency.dev) — first-party measurement · verified 2026-08-26 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings