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grok-4-fast-non-reasoning vs Kimi K3

Output tokens cost $0.50 per million on grok-4-fast-non-reasoning and $15.00 per million on Kimi K3. Input tokens cost $0.20 per million on grok-4-fast-non-reasoning and $3.00 per million on Kimi K3. Cached input tokens are billed at $0.05 per million on grok-4-fast-non-reasoning and $0.30 per million on Kimi K3. Context lengths are 2,000,000 tokens on grok-4-fast-non-reasoning and 1,048,576 tokens on Kimi K3. Time to first token (TTFT) measured on AIHubMix is 2.7s on grok-4-fast-non-reasoning and 0.9s on Kimi K3. Measured output throughput is 136.9 tok/s on grok-4-fast-non-reasoning and 73.1 tok/s on Kimi K3. On the LMArena coding leaderboard grok-4-fast-non-reasoning scores 1459 and Kimi K3 scores 1531.

Grokgrok-4-fast-non-reasoningMoonshot AIKimi K3
+ Add model · 2/4
Grok logo
grok-4-fast-non-reasoning
Grok · text, image → text

Grok-4-fast is a cost-effective inference model developed by xAI that delivers cutting-edge performance with excellent token efficiency. The model features a 2 million token context window, advanced Web and X search capabilities, and a unified architecture supporting both "inference" and "non-inference" modes. Compared to Grok 4, it reduces thinking tokens by an average of 40% and lowers the price by 98% while achieving the same performance.

Input$0.20 /M
Output$0.50 /M
Details
Moonshot AI logo
Kimi K3
Moonshot AI · text, image, video → text

Kimi K3 is Kimi’s flagship model for long-horizon coding and end-to-end knowledge work, with a 1M-token context window and industry-leading intelligence.

Input$3.00 /M
Output$15.00 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

grok-4-fast-non-reasoning
Kimi K3
Input /M
$0.20
$3.00
Output /M
$0.50
$15.00
Cache read /M
$0.05
$0.30
Context length
2,000,000
1,048,576
Max output
30,000
1,048,576
Time to First Token
2.7 s
0.9 s
Throughput
136.9 tok/s
73.1 tok/s
Modalities
textimage
textimagevideo
Supported Parameters
toolsfunction callingstructured outputs
thinkingfunction callingstructured outputs
API Formats
Released
-
-

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

grok-4-fast-non-reasoningkimi-k3

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

grok-4-fast-non-reasoningkimi-k3

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
grok-4-fast-non-reasoningkimi-k3
1360142014801540
Overall
14211486
Coding
14591531
Math
14241424
Hard prompts
14331505
Instruction following
14001479
Multi-turn
14241499
Creative writing
13861470
Longer query
14211502
Chinese
14831527
English
14291491

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

grok-4-fast-non-reasoning
$19.50 /mo
Kimi K3
$405 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: grok-4-fast-non-reasoning, Kimi K3?

grok-4-fast-non-reasoning: $0.50/M output tokens; Kimi K3: $15.00/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Kimi K3: 1531; grok-4-fast-non-reasoning: 1459 (LMArena coding leaderboard).

Which responds faster?

Kimi K3: 0.9s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

grok-4-fast-non-reasoning accepts 2,000,000 and Kimi K3 accepts 1,048,576 input tokens. Maximum output per request is 30,000 tokens on grok-4-fast-non-reasoning and 1,048,576 tokens on Kimi K3.

Which one generates tokens faster?

grok-4-fast-non-reasoning at 136.9 tok/s and Kimi K3 at 73.1 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

grok-4-fast-non-reasoning accepts text and image input and supports tool calling, function calling and structured outputs; Kimi K3 accepts text, image and video input and supports thinking, function calling and structured outputs.

Can I call grok-4-fast-non-reasoning and Kimi K3 with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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