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GPT 5 Pro vs Kimi K3

Output tokens cost $120.00 per million on GPT 5 Pro and $15.00 per million on Kimi K3. Input tokens cost $15.00 per million on GPT 5 Pro and $3.00 per million on Kimi K3. Cached input tokens are billed at $15.00 per million on GPT 5 Pro and $0.30 per million on Kimi K3. Context lengths are 400,000 tokens on GPT 5 Pro and 1,048,576 tokens on Kimi K3. Time to first token (TTFT) measured on AIHubMix is 313.1s on GPT 5 Pro and 0.9s on Kimi K3. Measured output throughput is 8.6 tok/s on GPT 5 Pro and 73.1 tok/s on Kimi K3.

OpenAIGPT 5 ProMoonshot AIKimi K3
+ Add model · 2/4
OpenAI logo
GPT 5 Pro
OpenAI · text, image → text

GPT-5 pro uses more compute to think harder and provide consistently better answers. GPT-5 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 pro is designed to tackle tough problems, some requests may take several minutes to finish. To avoid timeouts, try using background mode. As our most advanced reasoning model, GPT-5 pro defaults to (and only supports) reasoning.effort: high. GPT-5 pro does not support code interpreter.

Input$15.00 /M
Output$120.00 /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 Pro
Kimi K3
Input /M
$15.00
$3.00
Output /M
$120.00
$15.00
Cache read /M
$15.00
$0.30
Context length
400,000
1,048,576
Max output
128,000
1,048,576
Time to First Token
313.1 s
0.9 s
Throughput
8.6 tok/s
73.1 tok/s
Modalities
textimage
textimagevideo
Supported Parameters
thinkingtoolsfunction 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-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-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 Pro
$2,700 /mo

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

FAQ

Which is cheaper: GPT 5 Pro, Kimi K3?

Kimi K3: $15.00/M output tokens; GPT 5 Pro: $120.00/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 Pro accepts 400,000 and Kimi K3 accepts 1,048,576 input tokens. Maximum output per request is 128,000 tokens on GPT 5 Pro and 1,048,576 tokens on Kimi K3.

Which one generates tokens faster?

Kimi K3 at 73.1 tok/s and GPT 5 Pro at 8.6 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 Pro accepts text and image input and supports thinking, 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 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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