Model Comparison
Claude 3 Sonnet vs Kimi K3Which is better in 2026?
Kimi K3 significantly outperforms across most benchmarks. Claude 3 Sonnet and Kimi K3 cost the same.
Verdict: Claude 3 Sonnet vs Kimi K3 — which is better?
Claude 3 Sonnet (by Anthropic) and Kimi K3 (by Moonshot AI) 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.
Claude 3 Sonnet outperforms in 0 benchmarks, while Kimi K3 is better at 1 benchmark (GPQA). Kimi K3 significantly outperforms across most benchmarks.
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 Claude 3 Sonnet if…
- you want predictable pricing at $3.00/M input and $15.00/M output
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
Performance Benchmarks
Comparative analysis across standard metrics
Claude 3 Sonnet outperforms in 0 benchmarks, while Kimi K3 is better at 1 benchmark (GPQA).
Kimi K3 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Claude 3 Sonnet ($3.00/1M tokens) costs the same as Kimi K3 ($3.00/1M tokens).
For output processing, Claude 3 Sonnet ($15.00/1M tokens) costs the same as Kimi K3 ($15.00/1M tokens).
In conclusion, Claude 3 Sonnet and Kimi K3 cost the same.*
* 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 Claude 3 Sonnet's 200,000 tokens. Kimi K3 can generate longer responses up to 1,048,576 tokens, while Claude 3 Sonnet is limited to 200,000 tokens.
Input Capabilities
Supported data types and modalities
Both Claude 3 Sonnet and Kimi K3 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude 3 Sonnet
Kimi K3
Release Timeline
When each model was launched
Claude 3 Sonnet was released on 2024-02-29, while Kimi K3 was released on 2026-07-16.
Kimi K3 is 29 months newer than Claude 3 Sonnet.
Feb 29, 2024
2.4 years ago
Jul 16, 2026
2 days ago
2.4yr newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3 Sonnet is available from Anthropic, Bedrock, Google. Kimi K3 is available from Moonshot AI.
Claude 3 Sonnet
Kimi K3
Outputs Comparison
Key Takeaways
Claude 3 Sonnet
View detailsAnthropic
No standout differentiators in the data we have for this pair.
Kimi K3
View detailsMoonshot AI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Claude 3 Sonnet and Kimi K3 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Claude 3 Sonnet vs Kimi K3.