Best for coding
Good code quality, debugging and technical explanation.
Model · StepFun
Step 5 Preview
Step 5 Preview is served by StepFun through OpenRouter. It provides 1M tokens of context and supports text, vision, video inputs.
Context window
1M tokens
Input / 1M tokens
$1.00
Output / 1M tokens
$2.70
Key facts
| Provider | StepFun |
| OpenRouter ID | stepfun/step-5-preview |
| Modalities | Text, Vision, Video |
| Best for | Agents, Coding, Multimodal |
Source
openrouter.ai/api/v1/models Verified 2026-10-10 Drift-checked daily 06:00 CST Best-fit workloads
Best multimodal
Handles images, files, audio or video inputs.
Best for agents
Tool use, structured output and multi-step reasoning.
Cost estimates
These examples use the 2026-10-10 input and output prices. Cache discounts, provider surcharges and tool fees are excluded.
| Workload | Input | Output | Estimated cost |
|---|---|---|---|
| Quick test | 20,000 | 5,000 | $0.034 |
| Product chat month | 500,000 | 125,000 | $0.838 |
| Document batch | 5,000,000 | 1,000,000 | $7.70 |
Strengths
- ✓ Reads video as well as text and images — the second row here that does
- ✓ Sparse mixture-of-experts: 27B active parameters out of 600B total, per the catalogue
- ✓ 1M-token window at $1 / $2.70 per million
Limitations
- ! Named Preview, and the catalogue makes no promise about what the final release costs
- ! 64,000-token output ceiling
- ! Text output only
OpenRouter API quickstart
Run these examples from your server or edge function. Keep the OpenRouter API key private and do not expose it in browser code.
cURL
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "stepfun/step-5-preview",
"messages": [{ "role": "user", "content": "Summarize this document in five bullet points." }],
"max_tokens": 500
}'JavaScript / TypeScript
const response = await fetch("https://openrouter.ai/api/v1/chat/completions", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.OPENROUTER_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
model: "stepfun/step-5-preview",
messages: [{ role: "user", content: "Summarize this document in five bullet points." }],
max_tokens: 500,
}),
});
const data = await response.json();
console.log(data.choices[0].message.content);How to evaluate Step 5 Preview
- Run five real tasks from your product, not generic demo prompts.
- Record token usage, latency and output quality.
- Estimate cost using your real input/output mix.
- Compare it against one model with a similar price and one stronger model.
Compare models View on OpenRouter ↗
Step 5 Preview FAQ
What is Step 5 Preview?
Step 5 Preview is a StepFun model available through OpenRouter. It supports text, vision, video inputs and is suited for agents, coding, multimodal workloads.
How much does Step 5 Preview cost on OpenRouter?
The 2026-10-10 snapshot lists $1.00 per 1M input tokens and $2.70 per 1M output tokens. Verify current pricing on OpenRouter before production.
How large is Step 5 Preview's context window?
Step 5 Preview offers 1M tokens of context in the current snapshot. Provider-specific limits and surcharges may apply.
Pricing and context data are based on a 2026-10-10 snapshot. Provider limits can change; always verify on OpenRouter before production.