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GPT-5.1-Codex Max vs Kimi K3

Output tokens cost $10.00 per million on GPT-5.1-Codex Max and $15.00 per million on Kimi K3. Input tokens cost $1.25 per million on GPT-5.1-Codex Max and $3.00 per million on Kimi K3. Cached input tokens are billed at $0.13 per million on GPT-5.1-Codex Max and $0.30 per million on Kimi K3. Context lengths are 400,000 tokens on GPT-5.1-Codex Max and 1,048,576 tokens on Kimi K3.

OpenAIGPT-5.1-Codex MaxMoonshot AIKimi K3
+ Add model · 2/4
OpenAI logo
GPT-5.1-Codex Max
OpenAI · text, image → text

GPT-5.1-Codex-Max is a frontier programming model built for the agent-driven era. Powered by an upgraded core reasoning architecture, it is specially trained for complex agentic tasks in software engineering, mathematics, and scientific research. It delivers faster performance, greater stability, and higher token efficiency across the entire development lifecycle, including code generation, refactoring, debugging, and engineering collaboration. With native support for multiple context windows and a built-in compaction mechanism, the model can coherently process millions of tokens within a single task.

Input$1.25 /M
Output$10.00 /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-5.1-Codex Max
Kimi K3
Input /M
$1.25
$3.00
Output /M
$10.00
$15.00
Cache read /M
$0.13
$0.30
Context length
400,000
1,048,576
Max output
128,000
1,048,576
Time to First Token
-
0.9 s
Throughput
-
73.1 tok/s
Modalities
textimage
textimagevideo
Supported Parameters
function callingstructured outputsthinking
thinkingfunction 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.

gpt-5.1-codex-maxkimi-k3

Tokens / day

-

Requests / day

-

Performance Past 3 Days

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

gpt-5.1-codex-maxkimi-k3

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

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Cost calculator

Estimate your monthly bill for the same workload on each model.

GPT-5.1-Codex Max
$225 /mo
Kimi K3
$405 /mo

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

FAQ

Which is cheaper: GPT-5.1-Codex Max, Kimi K3?

GPT-5.1-Codex Max: $10.00/M output tokens; Kimi K3: $15.00/M. Use the cost calculator above to estimate your own workload.

How large is each context window?

GPT-5.1-Codex Max accepts 400,000 and Kimi K3 accepts 1,048,576 input tokens. Maximum output per request is 128,000 tokens on GPT-5.1-Codex Max and 1,048,576 tokens on Kimi K3.

What inputs and capabilities does each model support?

GPT-5.1-Codex Max accepts text and image input and supports function calling, structured outputs and thinking; Kimi K3 accepts text, image and video input and supports thinking, function calling and structured outputs.

Can I call GPT-5.1-Codex Max 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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