Step 5 Preview

Step 5 Preview at a glance

StepFun released Step 5 Preview on September 18, 2026.

Step 5 Preview scores 28.5 on the Intelligence Index, the overall score the AI Benchmark rankings sort models by. This score comes from independent third-party model evaluations, which Franklin AI syncs automatically each day.

It costs $1.00 per million input tokens and $2.70 per million output tokens, so a sample workload of 1 million input tokens and 200,000 output tokens costs about $1.54. It writes about 154 output tokens per second, so a 500-token answer takes roughly 3.3 seconds once output starts, after a wait of about 0.91 seconds for the first token.

The benchmark data has no Coding Index, Math Index or individual benchmark results for Step 5 Preview yet.

Every pair of models in the catalogue has a head-to-head page. Pick Step 5 Preview and a rival on the model comparisons page to compare their scores, prices and speed side by side.