Grok 4.20 0309 Reasoning vs Kimi K3.1 Pro

Price, context window & benchmark comparison

Grok 4.20 0309 Reasoning

xAI

$1.25 / $2.50

Input / Output · per 1M tokens

Kimi K3.1 Pro

Moonshot AI

$2.00 / $10.00

Input / Output · per 1M tokens

Compare different models

Verdict: Grok 4.20 0309 Reasoning is 2.6× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix. Kimi K3.1 Pro has the larger context window (1M vs 1M).

	Grok 4.20 0309 Reasoning	Kimi K3.1 Pro
Input price / 1M	$1.25	$2.00
Output price / 1M	$2.50	$10.00
Blended price (3:1)	$1.56	$4.00
Cached input / 1M	$0.20	$0.20
Context window	1M	1M
Max output	30K	944K
Intelligence index	—	46
Coding index	—	—
Providers	—	2
Best provider uptime (30m)	—	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-10-16	2026-10-23
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Grok 4.20 0309 Reasoning or Kimi K3.1 Pro?

Grok 4.20 0309 Reasoning is 2.6× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix.

Grok 4.20 0309 Reasoning vs Kimi K3.1 Pro: which has a bigger context window?

Grok 4.20 0309 Reasoning: 1,000,000 tokens. Kimi K3.1 Pro: 1,048,576 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Grok 4.20 0309 Reasoning ≈ $3,750, Kimi K3.1 Pro ≈ $9,000.

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