Grok 4.20 vs Kimi K2 Thinking

Grok 4.20 versus Kimi K2 Thinking specifications and price.
metric	Grok 4.20	Kimi K2 Thinking
Input / 1M	$1.25	$0.60
Output / 1M	$2.50	$2.50
Context	2M	262K
Cost @ typical workload	$625/mo	$430/mo
Modality	text + image	Text only
Price source	list	routed
Provider	xAI	Moonshot

Which should you pick?

On a typical workload, Kimi K2 Thinking costs $430/mo against Grok 4.20's $625/mo — roughly 1.5× cheaper. But the ranking depends on your output-to-input ratio: output is the pricier direction for both, so an output-heavy job (code generation, long answers) widens the gap while an input-heavy one (summarization, retrieval) narrows it. If you need to fit more in a single prompt, Grok 4.20 has the larger 2M-token window (~3,000 pages). Only Grok 4.20 accepts image input — decisive if your prompts include images.

These are list and routed market prices, not measured outcomes. Two models at the same rate can still cost different amounts to finish the same task, because verbose or reasoning-heavy models emit more tokens. That gap is exactly what measured cost-per-task captures.

Frequently asked questions

Is Grok 4.20 or Kimi K2 Thinking cheaper?

For a typical workload (1,500 input + 500 output tokens × 200,000 requests/month), Kimi K2 Thinking costs $430/mo versus $625/mo for Grok 4.20 — about 1.5× less. Because output is priced higher than input, the winner can flip if your workload writes much more or less than this; check your own numbers in the calculator.

What's the main difference between Grok 4.20 and Kimi K2 Thinking?

On price, Grok 4.20 is $1.25/$2.50 per 1M (in/out) and Kimi K2 Thinking is $0.60/$2.50. Grok 4.20 has the larger context window at 2M tokens. Grok 4.20 also accepts image input, while Kimi K2 Thinking is text-only.

More comparisons

Grok 4.20 and Kimi K2 Thinking — full specs and price history.
API cost calculator — compare on your own workload.
All comparisons — the full head-to-head index.