Model Comparison

Claude 3 Opus vs Kimi K2 Base

Kimi K2 Base has a slight edge in benchmark performance.

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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Claude 3 Opus outperforms in 2 benchmarks (GPQA, GSM8k), while Kimi K2 Base is better at 3 benchmarks (MATH, MMLU, MMLU-Pro).

Kimi K2 Base has a slight edge in benchmark performance.

Sat Apr 11 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Cost data unavailable.

Lowest available price from all providers
Sat Apr 11 2026 • llm-stats.com
Anthropic
Claude 3 Opus
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
Moonshot AI
Kimi K2 Base
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
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Context Window

Maximum input and output token capacity

Only Claude 3 Opus specifies input context (200,000 tokens). Only Claude 3 Opus specifies output context (200,000 tokens).

Anthropic
Claude 3 Opus
Input200,000 tokens
Output200,000 tokens
Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Sat Apr 11 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude 3 Opus supports multimodal inputs, whereas Kimi K2 Base does not.

Claude 3 Opus can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude 3 Opus

Text
Images
Audio
Video

Kimi K2 Base

Text
Images
Audio
Video

License

Usage and distribution terms

Claude 3 Opus is licensed under a proprietary license, while Kimi K2 Base uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Claude 3 Opus

Proprietary

Closed source

Kimi K2 Base

MIT

Open weights

Release Timeline

When each model was launched

Claude 3 Opus was released on 2024-02-29, while Kimi K2 Base was released on 2025-07-11.

Kimi K2 Base is 17 months newer than Claude 3 Opus.

Claude 3 Opus

Feb 29, 2024

2.1 years ago

Kimi K2 Base

Jul 11, 2025

9 months ago

1.4yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher GPQA score (50.4% vs 48.1%)
Higher GSM8k score (95.0% vs 92.1%)
Moonshot AI
Has open weights
Higher MATH score (70.2% vs 60.1%)
Higher MMLU score (87.8% vs 86.8%)
Higher MMLU-Pro score (69.2% vs 68.5%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude 3 Opus
Moonshot AI
Kimi K2 Base

FAQ

Common questions about Claude 3 Opus vs Kimi K2 Base

Kimi K2 Base has a slight edge in benchmark performance. Claude 3 Opus is made by Anthropic and Kimi K2 Base is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Claude 3 Opus scores ARC-C: 96.4%, HellaSwag: 95.4%, GSM8k: 95.0%, MGSM: 90.7%, BIG-Bench Hard: 86.8%. Kimi K2 Base scores C-Eval: 92.5%, GSM8k: 92.1%, MMLU-redux-2.0: 90.2%, MMLU: 87.8%, TriviaQA: 85.1%.
Claude 3 Opus supports 200K tokens and Kimi K2 Base supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.
Claude 3 Opus is developed by Anthropic and Kimi K2 Base is developed by Moonshot AI.