Model Comparison

Claude Opus 4.5 vs Kimi K2 0905Which is better in 2026?

Claude Opus 4.5 significantly outperforms across most benchmarks. Kimi K2 0905 is 9.3x cheaper per token.

Verdict: Claude Opus 4.5 vs Kimi K2 0905 — which is better?

Claude Opus 4.5 (by Anthropic) and Kimi K2 0905 (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 Opus 4.5 outperforms in 1 benchmarks (GPQA), while Kimi K2 0905 is better at 0 benchmarks. Claude Opus 4.5 significantly outperforms across most benchmarks.

On price, Kimi K2 0905 is roughly 9.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Kimi K2 0905 also accepts a larger context window (262,144 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Nov 2025

Choose Kimi K2 0905 if…

  • cost matters — it's about 9.3x cheaper per token
  • you process long inputs — it offers a 262,144 token context window
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Opus 4.5 outperforms in 1 benchmarks (GPQA), while Kimi K2 0905 is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Sat Jun 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2 0905 costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 8.3x more expensive than Kimi K2 0905 ($0.60/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 10.0x more expensive than Kimi K2 0905 ($2.50/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than Kimi K2 0905.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sat Jun 13 2026 • llm-stats.com
Anthropic
Claude Opus 4.5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
Moonshot AI
Kimi K2 0905
Input tokens$0.60
Output tokens$2.50
Best providerNovita
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K2 0905 accepts 262,144 input tokens compared to Claude Opus 4.5's 200,000 tokens. Kimi K2 0905 can generate longer responses up to 262,144 tokens, while Claude Opus 4.5 is limited to 64,000 tokens.

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
Moonshot AI
Kimi K2 0905
Input262,144 tokens
Output262,144 tokens
Sat Jun 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Opus 4.5 supports multimodal inputs, whereas Kimi K2 0905 does not.

Claude Opus 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4.5

Text
Images
Audio
Video

Kimi K2 0905

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 Opus 4.5

Proprietary

Closed source

Kimi K2 0905

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Kimi K2 0905 was released on 2025-09-05.

Claude Opus 4.5 is 3 months newer than Kimi K2 0905.

Claude Opus 4.5

Nov 24, 2025

6 months ago

2mo newer
Kimi K2 0905

Sep 5, 2025

9 months ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Kimi K2 0905's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without Kimi K2 0905's cutoff date.

Claude Opus 4.5

Mar 2025

Kimi K2 0905

—

Provider Availability

Claude Opus 4.5 is available from Anthropic. Kimi K2 0905 is available from Novita.

Claude Opus 4.5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

Kimi K2 0905

novita logo
Novita
Input Price:Input: $0.60/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Supports multimodal inputs
Higher GPQA score (87.0% vs 75.8%)
Moonshot AI
Larger context window (262,144 tokens)
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Moonshot AI
Kimi K2 0905

FAQ

Common questions about Claude Opus 4.5 vs Kimi K2 0905.

Which is better, Claude Opus 4.5 or Kimi K2 0905?

Claude Opus 4.5 significantly outperforms across most benchmarks. Claude Opus 4.5 is made by Anthropic and Kimi K2 0905 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.5 compare to Kimi K2 0905 in benchmarks?

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. Kimi K2 0905 scores HumanEval: 94.5%, MMLU: 90.2%, MATH: 89.1%, MMLU-Pro: 82.5%, GPQA: 75.8%.

Is Claude Opus 4.5 cheaper than Kimi K2 0905?

Kimi K2 0905 is 8.3x cheaper for input tokens. Claude Opus 4.5 costs $5.00/M input and $25.00/M output via anthropic. Kimi K2 0905 costs $0.60/M input and $2.50/M output via novita.

What are the context window sizes for Claude Opus 4.5 and Kimi K2 0905?

Claude Opus 4.5 supports 200K tokens and Kimi K2 0905 supports 262K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 4.5 and Kimi K2 0905?

Key differences include context window (200K vs 262K), input pricing ($5.00 vs $0.60/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.5 and Kimi K2 0905?

Claude Opus 4.5 is developed by Anthropic and Kimi K2 0905 is developed by Moonshot AI.

Related comparisons