Model Comparison
Kimi K3 vs Mercury 2Which is better in 2026?
Kimi K3 significantly outperforms across most benchmarks. Mercury 2 is 16.0x cheaper per token.
Verdict: Kimi K3 vs Mercury 2 — which is better?
Kimi K3 (by Moonshot AI) and Mercury 2 (by Inception) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Kimi K3 outperforms in 1 benchmarks (GPQA), while Mercury 2 is better at 0 benchmarks. Kimi K3 significantly outperforms across most benchmarks.
On price, Mercury 2 is roughly 16.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Kimi K3 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Choose Kimi K3 if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Jul 2026
Choose Mercury 2 if…
- cost matters — it's about 16.0x cheaper per token
Performance Benchmarks
Comparative analysis across standard metrics
Kimi K3 outperforms in 1 benchmarks (GPQA), while Mercury 2 is better at 0 benchmarks.
Kimi K3 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Kimi K3 ($3.00/1M tokens) is 12.0x more expensive than Mercury 2 ($0.25/1M tokens).
For output processing, Kimi K3 ($15.00/1M tokens) is 20.0x more expensive than Mercury 2 ($0.75/1M tokens).
In conclusion, Kimi K3 is more expensive than Mercury 2.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Kimi K3 accepts 1,048,576 input tokens compared to Mercury 2's 128,000 tokens. Kimi K3 can generate longer responses up to 1,048,576 tokens, while Mercury 2 is limited to 8,192 tokens.
Input Capabilities
Supported data types and modalities
Kimi K3 supports multimodal inputs, whereas Mercury 2 does not.
Kimi K3 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Kimi K3
Mercury 2
Release Timeline
When each model was launched
Kimi K3 was released on 2026-07-16, while Mercury 2 was released on 2026-02-24.
Kimi K3 is 5 months newer than Mercury 2.
Jul 16, 2026
1 weeks ago
4mo newerFeb 24, 2026
5 months ago
Knowledge 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 Moonshot AI. Mercury 2 is available from Inception.
Kimi K3
Mercury 2
Outputs Comparison
Key Takeaways
Kimi K3
View detailsMoonshot AI
Mercury 2
View detailsInception
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Kimi K3 and Mercury 2 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Kimi K3 vs Mercury 2.