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
← ModelsKimi K3
O4 Mini
Kimi K3 vs O4 Mini
Output tokens cost $15.00 per million on Kimi K3 and $4.40 per million on O4 Mini. Input tokens cost $3.00 per million on Kimi K3 and $1.10 per million on O4 Mini. Cached input tokens are billed at $0.30 per million on Kimi K3 and $0.28 per million on O4 Mini. Context lengths are 1,048,576 tokens on Kimi K3 and 200,000 tokens on O4 Mini. Time to first token (TTFT) measured on AIHubMix is 0.9s on Kimi K3 and 5.8s on O4 Mini. Measured output throughput is 73.1 tok/s on Kimi K3 and 93.9 tok/s on O4 Mini. On the LMArena coding leaderboard Kimi K3 scores 1531 and O4 Mini scores 1432.
Kimi K3O4 Mini+ Add model · 2/4
O4 Mini
OpenAI · text, image → text
o4-mini is a remarkably smart model for its speed and cost-efficiency. This allows it to support significantly higher usage limits than o3, making it a strong high-volume, high-throughput option for everyone with questions that benefit from reasoning.
Input$1.10 /M
Output$4.40 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Kimi K3
O4 Mini
Input /M
$3.00
$1.10
Output /M
$15.00
$4.40
Cache read /M
$0.30
$0.28
Context length
1,048,576
200,000
Max output
1,048,576
100,000
Time to First Token
0.9 s
5.8 s
Throughput
73.1 tok/s
93.9 tok/s
Modalities
textimagevideo
textimage
Supported Parameters
thinkingfunction callingstructured outputs
thinkingtoolfunction 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.
kimi-k3o4-mini
Tokens / day
-
Requests / day
-
Performance Past 3 Days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
kimi-k3o4-mini
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
LMArena Benchmarks
LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.
Text
kimi-k3o4-mini
13201380144015001560
Overall
13901486
Coding
14321531
Math
14161416
Hard prompts
14061505
Instruction following
13681479
Multi-turn
13811499
Creative writing
13381470
Longer query
13681502
Chinese
14001527
English
14031491
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.
O4 Mini
$132 /mo
Kimi K3
$405 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: Kimi K3, O4 Mini?
O4 Mini: $4.40/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; O4 Mini: 1432 (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?
Kimi K3 accepts 1,048,576 and O4 Mini accepts 200,000 input tokens. Maximum output per request is 1,048,576 tokens on Kimi K3 and 100,000 tokens on O4 Mini.
Which one generates tokens faster?
O4 Mini at 93.9 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?
Kimi K3 accepts text, image and video input and supports thinking, function calling and structured outputs; O4 Mini accepts text and image input and supports thinking, tool calling, function calling and structured outputs.
Can I call Kimi K3 and O4 Mini 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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