Kimi K3 vs Kimi K3.1 Pro
Kimi K3.1 Pro leads the LLM Stats Score 55.5 to 51.3. Kimi K3.1 Pro is 1.4x cheaper per token.
Moonshot AI · Moonshot AI · Updated for 2026
Which is better?
Kimi K3.1 Pro leads the overall LLM Stats Score 55.5 to 51.3, ranking #5 overall.
In the 15 individual benchmarks reported for both models, Kimi K3.1 Pro wins 11; this is a narrower head-to-head signal than the composite indexes.
On price, Kimi K3.1 Pro is roughly 1.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Kimi K3
- you need open weights you can self-host or fine-tune
Choose Kimi K3.1 Pro
- overall performance matters — it scores 55.5 and ranks #5 on LLM Stats
- you value its reported benchmark strengths — it wins 11 of 15 exact shared results
- cost matters — it's about 1.4x cheaper per token
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
31 reported for Kimi K3 · 30 for Kimi K3.1 Pro
Kimi K3 outperforms in 4 benchmarks (CharXiv-R, Humanity's Last Exam, PostTrainBench, ZEROBench), while Kimi K3.1 Pro is better at 11 benchmarks (APEX-Agents, BabyVision, BrowseComp, DeepSWE, GPQA, Kimi Code Bench v2, MMMU-Pro, MMMU-Pro (with tools), OfficeQA Pro, PerceptionBench, SWE-Marathon).
Kimi K3.1 Pro shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Kimi K3 ($2.85/1M tokens) is 1.4x more expensive than Kimi K3.1 Pro ($2.00/1M tokens).
For output processing, Kimi K3 ($14.25/1M tokens) is 1.4x more expensive than Kimi K3.1 Pro ($10.00/1M tokens).
In conclusion, Kimi K3 is more expensive than Kimi K3.1 Pro.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,048,576 tokens. Both models can generate responses up to 1,048,576 tokens.
Input capabilities
Documented input modalities across available providers
Both Kimi K3 and Kimi K3.1 Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Kimi K3
Kimi K3.1 Pro
Release Timeline
When each model was launched
Kimi K3 was released on 2026-07-16, while Kimi K3.1 Pro was released on 2026-10-23.
Kimi K3.1 Pro is 3 months newer than Kimi K3.
Jul 16, 2026
3 months ago
Oct 23, 2026
3 days ago
3mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Kimi K3 is available from DeepInfra, Fireworks, Moonshot AI, Novita, Together. Kimi K3.1 Pro is available from Moonshot AI.
Kimi K3
Kimi K3.1 Pro
Outputs Comparison
Judge for yourself.
Run your own prompts against Kimi K3 and Kimi K3.1 Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about Kimi K3 vs Kimi K3.1 Pro.