Question 1

What does this Kimi K2 Thinking vs Step 3.7 Flash 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: Kimi K2 Thinking or Step 3.7 Flash?

Accepted Answer

Kimi K2 Thinking lists $0.60 input and $2.50 output per 1M tokens. Step 3.7 Flash lists $0.185 input and $1.11 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: Kimi K2 Thinking or Step 3.7 Flash?

Accepted Answer

Kimi K2 Thinking lists 262.14K tokens and Step 3.7 Flash lists 256K. Kimi K2 Thinking therefore has the larger recorded context window, but capacity alone is not a quality score.

Question 4

Which is faster: Kimi K2 Thinking or Step 3.7 Flash?

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 Kimi K2 Thinking and Step 3.7 Flash support?

Accepted Answer

Kimi K2 Thinking records text input and text output. Step 3.7 Flash 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 Kimi K2 Thinking or Step 3.7 Flash?

Accepted Answer

Consider Kimi K2 Thinking if you need larger context or larger maximum output. Consider Step 3.7 Flash if you need 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	Kimi K2 Thinking	Step 3.7 Flash
Provider	Moonshot AI	StepFun
Listed pricing route	Moonshot AI	StepFun
Model family	kimi-thinking	—
Accepted inputs	text	text, image, video
Produced outputs	text	text
Context window	262.14KHigher	256K
Max output	262.14KHigher	256K
Input price / 1M	$0.60	$0.185Lower
Output price / 1M	$2.50	$1.11Lower
Reasoning mode	Documented	Documented
Tool calling	Documented	Documented
Image input	Not documented	Documented
Audio input	Not documented	Not documented
Structured output	Not documented	Not documented
License	Open weights	Open weights

Kimi K2 Thinking vs Step 3.7 Flash

Kimi K2 Thinking

Step 3.7 Flash

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

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