Kimi K3.1 Pro

Kimi K3.1 Pro is Moonshot’s first K3.1-series model: a post-trained version of Kimi K3 with substantially larger post-training compute, a 1,048,576-token context window, vision input and reasoning effort control. The provider describes it as its most capable 3T-class open-weight model.

Pricing

The China platform lists ¥13 per 1M input tokens, ¥68 per 1M output tokens, with cached input at ¥1.3 per 1M — a 90% cache discount. A kimi-k3.1-pro-highspeed variant lists ¥26 / ¥136 with roughly 2–3x the throughput.

At an indicative 7.1 CNY/USD, that is about $1.83 input / $9.58 output per 1M tokens. The comparison to the previous flagship is the point: Kimi K3 lists $3.00/$15.00 on the international platform, so K3.1 Pro is roughly a third cheaper on input and a third cheaper on output — consistent with the provider’s own “about one-third lower” framing.

The number to be careful with is the currency. This record is in CNY because that is how the price was published; the international USD list was not available when the record was created. Any cross-provider comparison that mixes this row with USD rows without stating an exchange rate is not a comparison.

What changed from K3

• Larger post-training, described by the provider as joint RL across hundreds of downstream domains, rather than a new base model.
• Flat pricing: no tiering by context length, but cache writes are billed separately by TTL (5 minutes or 1 hour).
• Batch inference at 60% of the standard price, for kimi-k3.1-pro and kimi-k3.
• A highspeed variant at exactly double the standard price.

How to read it

China AI Hub analysis: K3.1 Pro is a price cut wrapped in a capability release. The architecture is inherited from K3; the changes are post-training and packaging. That makes the migration decision unusually simple for existing K3 users — same window, same deployment model, lower price — and unusually hard for K2 users, whose models retire by the end of December 2026 and who now face a flagship price instead of a mid-tier one.

Verify the CNY price on the platform before budgeting: it is the number most likely to move, and the international list may appear at a different level.