Model Comparison

Claude 3 Opus vs Kimi-k1.5Which is better in 2026?

Kimi-k1.5 significantly outperforms across most benchmarks.

Verdict: Claude 3 Opus vs Kimi-k1.5 — which is better?

Claude 3 Opus (by Anthropic) and Kimi-k1.5 (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 Opus outperforms in 0 benchmarks, while Kimi-k1.5 is better at 1 benchmark (MMLU). Kimi-k1.5 significantly outperforms across most benchmarks.

Choose Claude 3 Opus if…

  • you want predictable pricing at $15.00/M input and $75.00/M output

Choose Kimi-k1.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jan 2025
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude 3 Opus outperforms in 0 benchmarks, while Kimi-k1.5 is better at 1 benchmark (MMLU).

Kimi-k1.5 significantly outperforms across most benchmarks.

Sat Jun 06 2026 • llm-stats.com

Arena Performance

Human preference votes

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-k1.5
Input- tokens
Output- tokens
Sat Jun 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude 3 Opus and Kimi-k1.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude 3 Opus

Text
Images
Audio
Video

Kimi-k1.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude 3 Opus

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3 Opus was released on 2024-02-29, while Kimi-k1.5 was released on 2025-01-20.

Kimi-k1.5 is 11 months newer than Claude 3 Opus.

Claude 3 Opus

Feb 29, 2024

2.3 years ago

Kimi-k1.5

Jan 20, 2025

1.4 years ago

10mo 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

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Moonshot AI
Higher MMLU score (87.4% vs 86.8%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude 3 Opus
Moonshot AI
Kimi-k1.5

FAQ

Common questions about Claude 3 Opus vs Kimi-k1.5.

Which is better, Claude 3 Opus or Kimi-k1.5?

Kimi-k1.5 significantly outperforms across most benchmarks. Claude 3 Opus is made by Anthropic and Kimi-k1.5 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude 3 Opus compare to Kimi-k1.5 in benchmarks?

Claude 3 Opus scores ARC-C: 96.4%, HellaSwag: 95.4%, GSM8k: 95.0%, MGSM: 90.7%, BIG-Bench Hard: 86.8%. Kimi-k1.5 scores MATH-500: 96.2%, CLUEWSC: 91.4%, C-Eval: 88.3%, MMLU: 87.4%, IFEval: 87.2%.

What are the context window sizes for Claude 3 Opus and Kimi-k1.5?

Claude 3 Opus supports 200K tokens and Kimi-k1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Claude 3 Opus and Kimi-k1.5?

Claude 3 Opus is developed by Anthropic and Kimi-k1.5 is developed by Moonshot AI.

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