StepFunOpen weightsReleased 8 Oct 2026
stepfun/step-5-previewPeer group: 34 models with a blended list price over $1 per 1M tokens (3 input : 1 output). Charts below compare Step 5 Preview with all models; cost and speed charts focus on this peer group.
Verification score: the share of 80 questions from open datasets answered correctly. See the benchmark datasets.
Step 5 Preview circled; dashed line joins models no cheaper model beats
Step 5 Preview circled · accurate and quick sits top left
Step 5 Preview circled · output tokens, reasoning included
All models tested on the current suite
Average cost of one question, split into input, reasoning and answer tokens at each model's list price. Reasoning tokens are billed as output.
Peer group: blended price over $1
All models · lower is better
Median of 3 streamed runs of the same prompt, measured 25 Oct 2026.
Peer group (over $1) · higher is better
Peer group (over $1) · lower is better
Peer group (over $1) · lower is better
Step 5 Preview circled · quick to start and fast sits top left
Questions answered correctly in each category
Head to head with its closest rivals, other StepFun models and the top models overall.
Every host serving this model through OpenRouter, from OpenRouter's catalogue
| Host | Input / 1M | Output / 1M | Context | Max output | Quantization |
|---|---|---|---|---|---|
| InferenceNet | $1 | $2.7 | 1M | 131k | fp4 |
| Featherless | $1 | $2.7 | 262k | 33k | fp4 |
| DeepInfra | $1 | $2.7 | 1M | 66k | fp8 |
| StepFun | $1 | $2.7 | 1M | 64k | fp8 |
Scores, speed and billed cost are our own measurements. Prices, context window and hosts come from OpenRouter's catalogue on the test date.