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GPT-5.1-Codex Max vs Kimi K3

Compare GPT-5.1-Codex Max from OpenAI and Kimi K3 from Moonshot AI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

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 /M
Cache read$0.125 /M
Details
10% off
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$2.7 /M
Output$15$13.5 /M
Cache read$0.3$0.27 /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$2.7−10%
Output /M
$10
$15$13.5−10%
Cache read /M
$0.125
$0.3$0.27−10%
Context length
400,000
1,048,576
Max output
128,000
1,048,576
Time to First Token
6.6 s
0.9 s
Throughput
28.5 tok/s
73.1 tok/s
Modalities
textimage
textimagevideo
Supported Parameters
function callingstructured outputsthinking
thinkingfunction callingstructured outputs
API Formats
Released
November 13, 2025
July 16, 2026

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

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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-5.1-codex-maxkimi-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.

GPT-5.1-Codex Max
$225 /mo
Kimi K3
$405$365 /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/M output tokens; Kimi K3: $13.5/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-5.1-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.

Which one generates tokens faster?

Kimi K3 at 73.1 tok/s and GPT-5.1-Codex Max at 28.5 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-5.1-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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