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GPT 5.4 Pro vs Kimi K3

Output tokens cost $180.00 per million on GPT 5.4 Pro and $15.00 per million on Kimi K3. Input tokens cost $30.00 per million on GPT 5.4 Pro and $3.00 per million on Kimi K3. Cached input tokens are billed at $30.00 per million on GPT 5.4 Pro and $0.30 per million on Kimi K3. Context lengths are 1,050,000 tokens on GPT 5.4 Pro and 1,048,576 tokens on Kimi K3. Time to first token (TTFT) measured on AIHubMix is 8.6s on GPT 5.4 Pro and 0.9s on Kimi K3. Measured output throughput is 42.0 tok/s on GPT 5.4 Pro and 73.1 tok/s on Kimi K3.

OpenAIGPT 5.4 ProMoonshot AIKimi K3
+ Add model · 2/4
OpenAI logo
GPT 5.4 Pro
OpenAI · text, image → text

Please note: this model is extremely expensive and very slow. If a request fails due to network issues, you may still be charged heavily; we cannot refund charges incurred by requests to this model. GPT-5.4 pro is available in the Responses API only to enable support for multi-turn model interactions before responding to API requests, and other advanced API features in the future. Since GPT-5.4 pro is designed to tackle tough problems, some requests may take several minutes to finish. To avoid timeout, please set a longer timeout duration. It is recommended to use this under good network conditions.

Input$30.00 /M
Output$180.00 /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.

GPT 5.4 Pro
Kimi K3
Input /M
$30.00
$3.00
Output /M
$180.00
$15.00
Cache read /M
$30.00
$0.30
Context length
1,050,000
1,048,576
Max output
128,000
1,048,576
Time to First Token
8.6 s
0.9 s
Throughput
42.0 tok/s
73.1 tok/s
Modalities
textimage
textimagevideo
Supported Parameters
thinkingwebtoolsfunction callingstructured outputs
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.

gpt-5.4-prokimi-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.

gpt-5.4-prokimi-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.

Kimi K3
$405 /mo
GPT 5.4 Pro
$4,500 /mo

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

FAQ

Which is cheaper: GPT 5.4 Pro, Kimi K3?

Kimi K3: $15.00/M output tokens; GPT 5.4 Pro: $180.00/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?

GPT 5.4 Pro accepts 1,050,000 and Kimi K3 accepts 1,048,576 input tokens. Maximum output per request is 128,000 tokens on GPT 5.4 Pro and 1,048,576 tokens on Kimi K3.

Which one generates tokens faster?

Kimi K3 at 73.1 tok/s and GPT 5.4 Pro at 42.0 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

GPT 5.4 Pro accepts text and image input and supports thinking, web search, 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 GPT 5.4 Pro 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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