Measured on Composite
This model has not carried enough traffic on Composite yet to publish a success rate, a latency figure or a traffic rank. The numbers appear here once it has.
AI model
StepFun: Step 5 Preview
stepfun/step-5-preview
StepFun: Step 5 Preview is a 1,000,000-token model served on Composite at $1.25 per million tokens in and $3.38 per million tokens out.
Try in PlaygroundSpecifications
| Model ID | stepfun/step-5-preview |
|---|---|
| Provider | cv11 |
| Context window | 1,000,000 tokens |
| Accepts | text, image, video |
| Returns | text |
| Input price | $1.25 per million tokens |
| Output price | $3.38 per million tokens |
| Prompt caching | Supported — cached input is billed at the provider's cache rate, on credits and plans alike |
| Thinking | Always on for this model |
| Moderated | No |
| Cost on a monthly plan | About 11 plan credits per typical call (8k in, 1k out) |
| Routing endpoints | 2 (base plus 1 routing variant) |
Routing variants
The same model behind 1 alternative endpoint. Call the id directly to pin a route; the base id above picks for you.
| Route | Model ID | Provider | Price |
|---|---|---|---|
| cheapThink | stepfun/step-5-preview:cheapThink |
cv11 | $1.25 per million tokens input · $3.38 per million tokens output |
Pricing
$1.25 per million tokens input · $3.38 per million tokens output
Credits pay the provider’s price plus 25%; cache hits cost less.
On a monthly plan, a typical call (8k tokens in, 1k out) uses about 11 plan credits, at the provider's own price.
Provider
cv11
Roleplay fit
StepFun models are a China-based lab entry with competitive pricing for their capability class.
Context behavior
With a 1,000,000-token context window, it can hold a long-running roleplay or a full lorebook in memory without losing earlier plot details, so it suits multi-session campaigns and character cards with heavy backstory.
Cost for regular use
It sits in the mid-range on price, a reasonable pick for regular roleplay use without going for the cheapest option available.
From the provider
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
Supplied by cv11, not written by Composite.
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