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#169

Step 5 Preview

Stepfun Release: 2026-10-09 Tested on: 2026-10-09 03:50 stepfun/step-5-preview::high
600B total (27B active)MoEClosed
(high) (medium) (low)

Summary

Step 5 Preview scores 7.0 on AI BENCHY and ranks #169. It has 9.5 reliability, a 52.2% pass rate, $4.513 total cost, and 154.41s average response time.

What makes Step 5 Preview unique: It stands out most in Combined, where it ranks #1, while Anti-AI Tricks is its weakest area at #16.

Model facts

Researched on 2026-10-09

Reported
Parameters
600B total (27B active)
Architecture
MoE
Availability
Closed
License
-

OpenRouter reports 600B total / 27B active sparse MoE parameters for this exact API checkpoint. Vendor documentation confirms 1M context, 64K output and low/medium/high reasoning controls. No official downloadable exact checkpoint and license were verified in this registration; community mirrors alone do not establish an official open-source release. OpenRouter declares mandatory reasoning with medium default.

Parameter source Availability source

Score

7.0

Consistency

8.5

Reliability

9.5

Total Cost (Current Price)

$4.513

Total Output Tokens

1,581,325

Total Input Tokens

243,381

Input Price

$1.000 / 1M

Output Price

$2.700 / 1M

Cache Read Price

$0.050 / 1M

Cache Write Price

N/A

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Tests Correct

Wrong Tests: 13

Attempt pass rate: 52.2%

Flaky tests

4

Flaky tests had mixed outcomes across runs (at least one pass and one fail).

Response Time (avg)

154.41s

Response Time (max): 455.72s

Response Time (total): 3551.40s

No answer: 7 Wrong answer: 3 API error: 2 Did not follow instructions: 1

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#169 Step 5 Preview

high
Cost
$0.057
Time
150.1s
Tokens
20,970 tok

Charts

Choose the first model, then click a second model to open a side-by-side page.

Total Output Tokens

Score vs Total Output Tokens

Quick Compare

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Category Breakdown

Category Score Consistency Tests Correct
Agentic 10.0 10.0
Anti-AI Tricks 6.5 8.0
Coding 2.9 10.0
Combined 10.0 10.0
Data parsing and extraction 10.0 10.0
Domain specific 3.0 10.0
General Intelligence 3.4 9.3
Instructions following 7.3 5.8
Puzzle Solving 5.8 4.4
Tool Calling 10.0 10.0
Trivia 3.0 10.0

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