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Gemini 3.1 Pro Preview Customtools vs Kimi K3

Output tokens cost $12.00 per million on Gemini 3.1 Pro Preview Customtools and $15.00 per million on Kimi K3. Input tokens cost $2.00 per million on Gemini 3.1 Pro Preview Customtools and $3.00 per million on Kimi K3. Cached input tokens are billed at $0.50 per million on Gemini 3.1 Pro Preview Customtools and $0.30 per million on Kimi K3. Context lengths are 1,000,000 tokens on Gemini 3.1 Pro Preview Customtools and 1,048,576 tokens on Kimi K3. Time to first token (TTFT) measured on AIHubMix is 2.7s on Gemini 3.1 Pro Preview Customtools and 0.9s on Kimi K3. Measured output throughput is 103.4 tok/s on Gemini 3.1 Pro Preview Customtools and 73.1 tok/s on Kimi K3.

GoogleGemini 3.1 Pro Preview CustomtoolsMoonshot AIKimi K3
+ Add model · 2/4
Google logo
Gemini 3.1 Pro Preview Customtools
Google · text, image, audio, video → text

gemini-3.1-pro-preview-customtools For users who build applications mixing bash and custom tools, the Gemini 3.1 Pro preview provides a separate endpoint accessible via the API call gemini-3.1-pro-preview-customtools. This endpoint is better at prioritizing your custom tools (for example, view_file or search_code). Please note that while gemini-3.1-pro-preview-customtools is optimized for agent workflows that use custom tools and Bash, you may experience quality fluctuations in some use cases that cannot benefit from these tools.

Input$2.00 /M
Output$12.00 /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.

Gemini 3.1 Pro Preview Customtools
Kimi K3
Input /M
$2.00
$3.00
Output /M
$12.00
$15.00
Cache read /M
$0.50
$0.30
Context length
1,000,000
1,048,576
Max output
64,000
1,048,576
Time to First Token
2.7 s
0.9 s
Throughput
103.4 tok/s
73.1 tok/s
Modalities
textimageaudiovideo
textimagevideo
Supported Parameters
thinkingtoolsfunction callingstructured outputswebdeepsearchlong context
thinkingfunction callingstructured outputs
API Formats
chat_completions · gemini_api · claude_api
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.

gemini-3.1-pro-preview-customtoolskimi-k3

Tokens / day

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Requests / day

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Performance Past 3 Days

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

gemini-3.1-pro-preview-customtoolskimi-k3

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.

Gemini 3.1 Pro Preview Customtools
$300 /mo
Kimi K3
$405 /mo

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

FAQ

Which is cheaper: Gemini 3.1 Pro Preview Customtools, Kimi K3?

Gemini 3.1 Pro Preview Customtools: $12.00/M output tokens; Kimi K3: $15.00/M. Use the cost calculator above to estimate your own workload.

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?

Gemini 3.1 Pro Preview Customtools accepts 1,000,000 and Kimi K3 accepts 1,048,576 input tokens. Maximum output per request is 64,000 tokens on Gemini 3.1 Pro Preview Customtools and 1,048,576 tokens on Kimi K3.

Which one generates tokens faster?

Gemini 3.1 Pro Preview Customtools at 103.4 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?

Gemini 3.1 Pro Preview Customtools accepts text, image, audio and video input and supports thinking, tool calling, function calling, structured outputs, web search, deep search and long context; Kimi K3 accepts text, image and video input and supports thinking, function calling and structured outputs.

Can I call Gemini 3.1 Pro Preview Customtools 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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