Kimi K3 (Reasoning)

by Moonshot AI

Kimi K3 (Reasoning) is a reasoning model from Moonshot AI, released on July 16, 2026. It has a 1M-token context window and can generate up to 1M output tokens. API pricing is $2.85 per 1M input tokens and $14.25 per 1M output tokens. It ranks #9 of 220 models by Intelligence Score with a score of 52.1.

Kimi K3 is Moonshot AI's flagship open Mixture-of-Experts model for long-horizon coding, knowledge work, and reasoning. It has 2.8 trillion total parameters, activates 16 of 896 experts, and combines Kimi Delta Attention, Attention Residuals, and Stable LatentMoE. The model supports a 1M-token context window, native image and video understanding, tool calling, structured output, and always-on reasoning with max thinking effort at launch.

Key specs

ProviderMoonshot AI
Release date2026-07-16
Licenseopen weights
Context window1M tokens
Max output1M tokens
Input price$2.85 / 1M tokens
Output price$14.25 / 1M tokens
Intelligence Score52.1
Coding index41.1
Output speed90 tokens/s
Time to first token6.03 s

Quick answers

What is the context window of Kimi K3 (Reasoning)?

Kimi K3 (Reasoning) has a context window of 1M tokens, with a maximum output of 1M tokens per response.

How much does Kimi K3 (Reasoning) cost?

Kimi K3 (Reasoning) costs $2.85 per 1M input tokens and $14.25 per 1M output tokens through the API.

Is Kimi K3 (Reasoning) open source?

Yes. Kimi K3 (Reasoning) is an open model released under the open weights license.

When was Kimi K3 (Reasoning) released?

Moonshot AI released Kimi K3 (Reasoning) on July 16, 2026.

How does Kimi K3 (Reasoning) compare to Claude Opus 5.5 (Reasoning)?

Kimi K3 (Reasoning) scores 52.1 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1. Input pricing is $2.85 vs $4 per 1M tokens.

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