Which is cheaper, Kimi K3 and Grok 4.6?

Grok 4.6 has the lowest input price. Per 1M input tokens: Kimi K3 from $2.70 and Grok 4.6 from $2.00.

Which has the larger context window, Kimi K3 and Grok 4.6?

Kimi K3 has the largest context window: Kimi K3 1,048,576 tokens and Grok 4.6 500,000 tokens.

Which is better for coding, Kimi K3 and Grok 4.6?

Grok 4.6 scores highest on the Artificial Analysis Coding Index: Kimi K3 76.2 and Grok 4.6 76.8.

Which is smarter, Kimi K3 and Grok 4.6?

Grok 4.6 scores highest on the Artificial Analysis Intelligence Index: Kimi K3 43.6 and Grok 4.6 44.3.

Can I switch between Kimi K3 and Grok 4.6 without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (moonshotai/kimi-k3, x-ai/grok-4.6).

Kimi K3 vs Grok 4.6

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Kimi K3 MoonshotAImoonshotai/kimi-k3

Grok 4.6 xAIx-ai/grok-4.6

Creator

MoonshotAI

xAI

Released

Jul 16, 2026

Aug 12, 2026

Context window

1.05M

500K

Max output

1.05M

500K

Input / 1MLowest provider price

$2.70$2.70–$3.00 across 4

$2.00

Output / 1MLowest provider price

$13.50$13.50–$15.00 across 4

$6.00

Providers

IntelligenceArtificial Analysis index

43.6

44.3

CodingArtificial Analysis index

76.2

76.8

LatencyMedian time to first token

7.4s

—

ThroughputMedian tokens per second

<1 t/s

—

Accepts

Text, Image

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Kimi K3 vs Grok 4.6: summary

Kimi K3 and Grok 4.6 are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Kimi K3, from MoonshotAI, has a 1,048,576-token context window, costs from $2.70/1M input and $13.50/1M output tokens across 4 providers and scores 43.6 on the Artificial Analysis Intelligence Index.

Grok 4.6, from xAI, has a 500,000-token context window, costs $2.00/1M input and $6.00/1M output tokens and scores 44.3 on the Artificial Analysis Intelligence Index.

Grok 4.6 is the cheapest on input, 1.4× cheaper than the next model, Kimi K3 has the largest context window, Grok 4.6 scores highest for intelligence and Grok 4.6 leads on coding.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="moonshotai/kimi-k3", messages=[...]) # or client.chat.completions.create(model="x-ai/grok-4.6", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis