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Claude Opus 5 vs Kimi-k1.5

Claude Opus 5 leads the LLM Stats Score 54.9 to 17.2.

Anthropic · Moonshot AI · Updated for 2026

Which is better?

Claude Opus 5 leads the overall LLM Stats Score 54.9 to 17.2, ranking #5 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Opus 5

  • overall performance matters — it scores 54.9 and ranks #5 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Jul 2026

Choose Kimi-k1.5

  • you are already invested in the Moonshot AI ecosystem

At a glance

The differences that matter most.

Claude Opus 5
Anthropic
Kimi-k1.5
Moonshot AI
Core performance indexes
LLM Stats Score
54.9
#5
17.2
#217
Reasoning
53.9
#4
16.4
#214
Cost, coverage & limits
Benchmark wins
—
—
Input price
$5.00 / M
— / M
Output price
$25.00 / M
— / M
Context window
1,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Opus 5
Kimi-k1.5
Vision
37.9#4
11.0#111
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

13 reported for Claude Opus 5 · 9 for Kimi-k1.5

No common benchmarks found

Claude Opus 5 and Kimi-k1.5don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Opus 5 specifies input context (1,000,000 tokens). Only Claude Opus 5 specifies output context (128,000 tokens).

Anthropic
Claude Opus 5
Input1,000,000 tokens
Output128,000 tokens
Moonshot AI
Kimi-k1.5
Input- tokens
Output- tokens
Sun Sep 13 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

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

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

Claude Opus 5

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 Opus 5

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5 was released on 2026-07-24, while Kimi-k1.5 was released on 2025-01-20.

Claude Opus 5 is 18 months newer than Kimi-k1.5.

Claude Opus 5

Jul 24, 2026

1 months ago

1.5yr newer
Kimi-k1.5

Jan 20, 2025

1.6 years 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

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Opus 5 and Kimi-k1.5 side-by-side, then vote on the output you prefer.

Claude Opus 5
✓ Preferred
Kimi-k1.5
Open in Playground

FAQ

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

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

Claude Opus 5 leads the LLM Stats Score 54.9 to 17.2. Claude Opus 5 is made by Anthropic and Kimi-k1.5 is made by Moonshot AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 5 compare to Kimi-k1.5 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-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 Opus 5 and Kimi-k1.5?

Claude Opus 5 supports 1.0M 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.

What are the main differences between Claude Opus 5 and Kimi-k1.5?

Key differences include LLM Stats Score (54.9 vs 17.2). See the full comparison above for benchmark-by-benchmark results.

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

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

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