Model Comparison

Claude Opus 5 vs Kimi K2 0905Which is better in 2026?

Comparing Claude Opus 5 and Kimi K2 0905 across benchmarks, pricing, and capabilities.

Verdict: Claude Opus 5 vs Kimi K2 0905 — which is better?

Claude Opus 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.

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.

Claude Opus 5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 5 if…

  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Jul 2026

Choose Kimi K2 0905 if…

  • cost matters — it's about 9.3x cheaper per token

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Opus 5 and Kimi K2 0905don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2 0905 costs less

For input processing, Claude Opus 5 ($5.00/1M tokens) is 8.3x more expensive than Kimi K2 0905 ($0.60/1M tokens).

For output processing, Claude Opus 5 ($25.00/1M tokens) is 10.0x more expensive than Kimi K2 0905 ($2.50/1M tokens).

In conclusion, Claude Opus 5 is more expensive than Kimi K2 0905.*

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

Lowest available price from all providers
Sun Jul 26 2026 • llm-stats.com
Anthropic
Claude Opus 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

Claude Opus 5 accepts 1,000,000 input tokens compared to Kimi K2 0905's 262,144 tokens. Kimi K2 0905 can generate longer responses up to 262,144 tokens, while Claude Opus 5 is limited to 128,000 tokens.

Anthropic
Claude Opus 5
Input1,000,000 tokens
Output128,000 tokens
Moonshot AI
Kimi K2 0905
Input262,144 tokens
Output262,144 tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Opus 5 supports multimodal inputs, whereas Kimi K2 0905 does not.

Claude Opus 5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 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 5

Proprietary

Closed source

Kimi K2 0905

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5 was released on 2026-07-24, while Kimi K2 0905 was released on 2025-09-05.

Claude Opus 5 is 11 months newer than Kimi K2 0905.

Claude Opus 5

Jul 24, 2026

1 days ago

10mo newer
Kimi K2 0905

Sep 5, 2025

10 months ago

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

Provider Availability

Claude Opus 5 is available from Anthropic. Kimi K2 0905 is available from Novita.

Claude Opus 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
Larger context window (1,000,000 tokens)
Supports multimodal inputs
Moonshot AI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Opus 5 and Kimi K2 0905 side-by-side, then vote on the output you prefer.

Claude Opus 5
✓ Preferred
Kimi K2 0905
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Opus 5
Moonshot AI
Kimi K2 0905

FAQ

Common questions about Claude Opus 5 vs Kimi K2 0905.

Which is better, Claude Opus 5 or Kimi K2 0905?

Claude Opus 5 (Anthropic) and Kimi K2 0905 (Moonshot AI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Claude Opus 5 compare to Kimi K2 0905 in benchmarks?

Claude Opus 5 scores BrowseComp: 90.8%, BioMysteryBench: 90.1%, OSWorld 2.0: 70.6%, DeepSWE 1.1: 68.8%, Humanity's Last Exam: 64.7%. Kimi K2 0905 scores HumanEval: 94.5%, MMLU: 90.2%, MATH: 89.1%, MMLU-Pro: 82.5%, GPQA: 75.8%.

Is Claude Opus 5 cheaper than Kimi K2 0905?

Kimi K2 0905 is 8.3x cheaper for input tokens. Claude Opus 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 5 and Kimi K2 0905?

Claude Opus 5 supports 1.0M 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 5 and Kimi K2 0905?

Key differences include context window (1.0M 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 5 and Kimi K2 0905?

Claude Opus 5 is developed by Anthropic and Kimi K2 0905 is developed by Moonshot AI.

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