StepFun
Step 5 Preview
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters).
At a glance
- Input / 1M
- $1
- Output / 1M
- $2.70
- Context
- 1M
- Max output
- 64K
- Intelligence
- Not available
- Released
- Oct 2026
Pricing
Step 5 Preview API pricing
Per-token rates, plus what common tasks actually cost.
| Input tokensPer 1M tokens | $1 |
|---|---|
| Output tokensPer 1M tokens | $2.70 |
| Cached input (read)Per 1M tokens | $0.05 |
| Cache writePer 1M tokens | Not available |
Chat message
2K in, 500 out
$3.35
per 1,000 requests
Coding task
30K in, 4K out
$40.80
per 1,000 requests
Long document summary
150K in, 2K out
$155.40
per 1,000 requests
Specs
Context window and capabilities
What it can read, what it can write, and which API features it supports.
- Context window
- 1M tokens
- Max output
- 64K tokens
- Input types
- Image, Text, Video
- Output types
- Text
- Reasoning effort
- High, Medium, Low
- Release date
- October 8, 2026
- Tool calling
- Structured outputs
- JSON mode
- Reasoning
- Temperature
- Stop sequences
- Deterministic seed
- Verbosity control
Compare
Step 5 Preview vs other models
See how Step 5 Preview stacks up head to head on price, benchmarks, and features.
Step 5 Preview vs DeepSeek V4.1 Flash
StepFun vs DeepSeek
See comparisonStep 5 Preview vs GLM 5.3 Flash
StepFun vs Z.ai
See comparisonStep 5 Preview vs MiMo-V2.6-Flash
StepFun vs Xiaomi
See comparisonStep 5 Preview vs Hy4 preview
StepFun vs Tencent
See comparison
Step 5 Preview vs GPT-6 Luna
StepFun vs OpenAI
See comparisonStep 5 Preview vs DeepSeek V4 Flash 0731
StepFun vs DeepSeek
See comparisonMore Step 5 Preview comparisons
- Step 5 Preview vs Claude Opus 5.5
- Step 5 Preview vs GLM 5.3
- Step 5 Preview vs DeepSeek V4 Flash 0423
- Step 5 Preview vs Gemini 3.8 Flash
- Step 5 Preview vs Hy3
- Step 5 Preview vs DeepSeek V4 Pro 0813
- Step 5 Preview vs Gemini 3 Flash Preview
- Step 5 Preview vs Qwen3.8 27B
- Step 5 Preview vs Gemini 2.5 Flash
- Step 5 Preview vs Step 3.7 Flash
Alternatives
Step 5 Preview alternatives
Similar models worth considering, and where each one has the edge.
Gemini 3.8 Flash
DeepSeek
DeepSeek V4.1 Flash
DeepSeek
DeepSeek V4 Pro 0813
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does Step 5 Preview cost?
Step 5 Preview costs $1 per 1M input tokens and $2.70 per 1M output tokens through the API. A typical chat message costs about $3.35 per 1,000 messages.
What is the context window of Step 5 Preview?
Step 5 Preview accepts up to 1M tokens of input and can write up to 64K tokens in a single response.
What is the best alternative to Step 5 Preview?
Gemini 3.8 Flash from Google is a strong alternative. It offers: larger 1.05m context, accepts file and audio.
Can I use Step 5 Preview alongside other models?
Yes. Shortcut Chat sends one prompt to Step 5 Preview and any other models you pick at the same time, so you can compare answers side by side.
Try Step 5 Preview next to every other model.
Use Step 5 Preview alongside all the other models. Use one at a time, or multiple together. Get the best answer from every AI.