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
Step 3.7 Flash
Kimi K3 vs Step 3.7 Flash
Output tokens cost $15.00 per million on Kimi K3 and $1.32 per million on Step 3.7 Flash. Input tokens cost $3.00 per million on Kimi K3 and $0.22 per million on Step 3.7 Flash. Cached input tokens are billed at $0.30 per million on Kimi K3 and $0.04 per million on Step 3.7 Flash. Context lengths are 1,048,576 tokens on Kimi K3 and 256,000 tokens on Step 3.7 Flash.
Kimi K3Step 3.7 Flash+ Add model · 2/4
Step 3.7 Flash
StepFun · text, image → text
step-3.7-flash is stepfun's flagship inference model, designed for high-complexity tasks that require deep reasoning and fast execution. It excels at decomposing multi-step problems, performing tool calls, and maintaining consistency across massive datasets. It is the preferred choice for complex workloads such as long-context agents, advanced software engineering, and end-to-end research automation.
Input$0.22 /M
Output$1.32 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Kimi K3
Step 3.7 Flash
Input /M
$3.00
$0.22
Output /M
$15.00
$1.32
Cache read /M
$0.30
$0.04
Context length
1,048,576
256,000
Max output
1,048,576
0
Time to First Token
0.9 s
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Throughput
73.1 tok/s
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Modalities
textimagevideo
textimage
Supported Parameters
thinkingfunction callingstructured outputs
API Formats
Released
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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-k3step-3.7-flash
Tokens / day
-
Requests / day
-
Performance Past 3 Days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
kimi-k3step-3.7-flash
Throughput (tok/s)
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TTFT (s)
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Uptime (%)
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Cost calculator
Estimate your monthly bill for the same workload on each model.
Step 3.7 Flash
$33.00 /mo
Kimi K3
$405 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: Kimi K3, Step 3.7 Flash?
Step 3.7 Flash: $1.32/M output tokens; Kimi K3: $15.00/M. Use the cost calculator above to estimate your own workload.
How large is each context window?
Kimi K3 accepts 1,048,576 and Step 3.7 Flash accepts 256,000 input tokens.
What inputs and capabilities does each model support?
Kimi K3 accepts text, image and video input and supports thinking, function calling and structured outputs; Step 3.7 Flash accepts text and image input.
Can I call Kimi K3 and Step 3.7 Flash 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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