Kimi K3.1 Pro

MoonshotAI · Released October 2026

Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window.

It belongs to Moonshot AI's Kimi family, open-weight models known for agentic tool use, where K3 leads and the K2.x Code and Thinking variants target their namesake strengths.

Facts and pricing

Provider

MoonshotAI

Context window

1.0M tokens

Input price

24.0 credits / 1M tokens ($2.00 raw)

Output price

120 credits / 1M tokens ($10.00 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

Try Kimi K3.1 Pro now

What Kimi K3.1 Pro is best for

• Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
• Very long documents and codebases: a 1.0M-token window fits entire books or repositories in one conversation
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a frontier model like Kimi K3.1 Pro:

• Review this business plan and give me the three hardest questions an investor would ask
• Rewrite this announcement so it lands with both engineers and executives
• I am choosing between two job offers, help me think through the tradeoffs
• Draft a technical design doc for a rate limiter, including failure modes

MoonshotAI family

Compare Kimi K3.1 Pro

• Kimi K3.1 Pro vs GPT-6 Sol
• Kimi K2 Thinking vs DeepSeek V4 Pro 0423
• Grok Build 0.1 vs Kimi K2.7 Code
• Kimi K2.7 Code vs Codestral 2508

Frequently asked questions

What is Kimi K3.1 Pro?

Kimi K3.1 Pro is an AI model by MoonshotAI. Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window.

How much does Kimi K3.1 Pro cost on Zeplik?

Input tokens cost 24.0 credits per million and output tokens 120 credits per million (1 credit = $0.10; the raw provider rates are $2.00 and $10.00 per million). New accounts start with free credits.

How long can a conversation with Kimi K3.1 Pro be?

Kimi K3.1 Pro has a 1.0M-token context window (1,048,576 tokens), which covers the conversation plus any documents you attach.

Does Kimi K3.1 Pro support images and tools?

Kimi K3.1 Pro accepts image input and supports tool calling.

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