Question 1

What does this LongCat 2.5 Preview vs Step 5 Preview comparison cover?

Accepted Answer

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

Question 2

Which is cheaper: LongCat 2.5 Preview or Step 5 Preview?

Accepted Answer

LongCat 2.5 Preview lists $0.30 input and $1.20 output per 1M tokens. Step 5 Preview lists $1.00 input and $2.70 output. The cheaper workload depends on the mix of input and output. Long-context tiers, caching, batch processing and retries can change the bill.

Question 3

Which has the larger context window: LongCat 2.5 Preview or Step 5 Preview?

Accepted Answer

Both records list a 1M-token context window. An equal limit does not imply equal recall, instruction following, or long-context quality.

Question 4

Which is faster: LongCat 2.5 Preview or Step 5 Preview?

Accepted Answer

There is no matched speed measurement for both models with the same source, host, region and date. Test the same prompts at your expected concurrency and measure time to the first useful response as well as complete task time.

Question 5

What input and output types do LongCat 2.5 Preview and Step 5 Preview support?

Accepted Answer

LongCat 2.5 Preview records text, image input and text output. Step 5 Preview records text, image, video input and text output. “Not documented” means the current source record is incomplete; it does not prove that a modality is unsupported.

Question 6

Should I choose LongCat 2.5 Preview or Step 5 Preview?

Accepted Answer

Consider LongCat 2.5 Preview if you need larger maximum output or a lower listed input rate or a lower listed output rate. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Specification	LongCat 2.5 Preview	Step 5 Preview
Provider	Meituan LongCat	StepFun
Listed pricing route	LongCat promotional API	StepFun
Model family	—	—
Accepted inputs	text, image	text, image, video
Produced outputs	text	text
Context window	1M	1M
Max output	131.07KHigher	65.54K
Input price / 1M	$0.30Lower	$1.00
Output price / 1M	$1.20Lower	$2.70
Reasoning mode	Documented	Documented
Tool calling	Not documented	Documented
Image input	Documented	Documented
Audio input	Not documented	Not documented
Structured output	Not documented	Documented
License	Publisher API terms	Publisher API terms

LongCat 2.5 Preview vs Step 5 Preview

LongCat 2.5 Preview

Step 5 Preview

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

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