gpt-oss-20b (High) vs Step 5 Preview
Which is better for the money: gpt-oss-20b (High) by OpenAI or Step 5 Preview by StepFun? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Trade-off
Verdict
Depends on your budget
Step 5 Preview scores 34.7 points higher (43.7 vs 9.0) but costs 41× as much to run the benchmark ($1190 vs $28.8; premium vs budget cost classes). They are not alternatives at one budget: pick Step 5 Preview when you need intelligence above 9.0, and gpt-oss-20b (High) when 9.0 is enough.
| Metric | gpt-oss-20b (High) | Step 5 Preview | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 9.0 | 43.7 | +385.6% Step 5 Preview is 4.9× more intelligent |
| Total AA cost (lower is better) | $28.81 | $1,190.26 | +4031.4% Step 5 Preview is 41× more expensive |
| End-to-end time (lower is better) | 16.79s | 12.06s | −28.2% Step 5 Preview is 28.2% faster |
| Price per 1M tokens (in / out) | $0.05 / $0.22 | $1.00 / $2.70 | |
| Input modalities | Text | Text, Image |
Step 5 Preview vs gpt-oss-20b (High): 385.6% more intelligence, 4031.4% more cost to run the AA benchmark, and 28.2% faster end-to-end.
Today's Pareto frontier
Against the frontier
- gpt-oss-20b (High) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
- Step 5 Preview is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
gpt-oss-20b (High)Step 5 PreviewToday's Pareto frontierOpen-weights frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-oss-20b/step-5 · Markdown: /api/v1/compare/gpt-oss-20b/step-5?format=md · llms.txt · agent skill