Claude 3.5 Sonnet vs Kimi-k1.5
Claude 3.5 Sonnet and Kimi-k1.5 are closely matched at 19.2 and 17.3 on the LLM Stats Score.
Anthropic · Moonshot AI · Updated for 2026
Which is better?
Claude 3.5 Sonnet and Kimi-k1.5 are closely matched on the overall LLM Stats Score at 19.2 and 17.3.
In the 3 individual benchmarks reported for both models, Kimi-k1.5 wins 2; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude 3.5 Sonnet
- you want predictable pricing at $3.00/M input and $15.00/M output
Choose Kimi-k1.5
- you value its reported benchmark strengths — it wins 2 of 3 exact shared results
- you want the most recent training data — it shipped Jan 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
19 reported for Claude 3.5 Sonnet · 9 for Kimi-k1.5
Claude 3.5 Sonnet outperforms in 1 benchmarks (MMLU), while Kimi-k1.5 is better at 2 benchmarks (MathVista, MMMU).
Kimi-k1.5 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Claude 3.5 Sonnet specifies input context (200,000 tokens). Only Claude 3.5 Sonnet specifies output context (200,000 tokens).
Input capabilities
Documented input modalities across available providers
Both Claude 3.5 Sonnet and Kimi-k1.5 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude 3.5 Sonnet
Kimi-k1.5
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude 3.5 Sonnet was released on 2024-10-22, while Kimi-k1.5 was released on 2025-01-20.
Kimi-k1.5 is 3 months newer than Claude 3.5 Sonnet.
Oct 22, 2024
1.9 years ago
Jan 20, 2025
1.6 years ago
3mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3.5 Sonnet and Kimi-k1.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3.5 Sonnet vs Kimi-k1.5.