Kimi K3.1 Pro vs Step 5 Preview

Price, context window & benchmark comparison

Kimi K3.1 Pro

Moonshot AI

$2.00 / $10.00

Input / Output · per 1M tokens

Step 5 Preview

StepFun

$1.00 / $2.70

Input / Output · per 1M tokens

Compare different models

Verdict: Step 5 Preview is 2.8× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix. Kimi K3.1 Pro scores higher on the Artificial Analysis Intelligence Index (46 vs 28.5).

	Kimi K3.1 Pro	Step 5 Preview
Input price / 1M	$2.00	$1.00
Output price / 1M	$10.00	$2.70
Blended price (3:1)	$4.00	$1.43
Cached input / 1M	$0.20	$0.10
Context window	1M	1M
Max output	944K	64K
Intelligence index	46	28.5
Coding index	—	—
Providers	2	—
Best provider uptime (30m)	100.0%	—
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-10-23	2026-10-08
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Kimi K3.1 Pro or Step 5 Preview?

Step 5 Preview is 2.8× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix.

Kimi K3.1 Pro vs Step 5 Preview: which has a bigger context window?

Kimi K3.1 Pro: 1,048,576 tokens. Step 5 Preview: 1,048,576 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Kimi K3.1 Pro ≈ $9,000, Step 5 Preview ≈ $3,350.

Kimi K3.1 Pro vs Step 5 Preview

Kimi K3.1 Pro

Step 5 Preview

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