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Stepfun
Step 5 Preview balancedruns locally
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). It performs strongly in software engineering and professional...
Input / 1M
$1.00
USD per million tokens
Output / 1M
$2.70
USD per million tokens
Est. cost / token
$0.000001425
$1.43 per 1M, 3:1 mix
Context window
1M
max output 64K
Major features
VisionOpen weightsCachingReasoningJSON schemaTools
Task suitability (heuristic 1–5, not a benchmark)
- coding4
- reasoning4
- math4
- summarization4
- extraction4
- classification4
- chat4
- creative4
- translation4
- vision4
- long context5
- agentic4
Run it locally
Will it run on my machine? →| Quantization | Quality | Memory needed (8K ctx) |
|---|---|---|
| Q2_K | poor | 273 GB |
| Q3_K_M | fair | 317 GB |
| Q4_K_Mrecommended | good | 395 GB |
| Q5_K_M | very good | 459 GB |
| Q6_K | excellent | 528 GB |
| Q8_0 | near-lossless | 681 GB |
| F16 | lossless | 1276 GB |
Estimates.
Price history
| Recorded | Input | Output | Cached | Source |
|---|---|---|---|---|
| 2026-11-05 03:20 | $1.00 | $2.70 | $0.10 | openrouter |
A row is added whenever a sync detects a price change. Vendor pricing source
Pricing (USD per 1M tokens)
- Input
- $1.00
- Output
- $2.70
- Cached input
- $0.10
- Blended (3:1)
- $1.43
Details
- Company
- Stepfun
- Version
- 5
- Family
- Step
- Released
- 2026-10-08
- Parameters
- 604.3B
- Max output
- 64K
- Open weights
- Yes
- Inputs
- image, text, video
- Last synced
- 46 min ago