Claude Sonnet 5 vs Kimi K2 0905 (Comparative Analysis)
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Comparative Analysis: Claude Sonnet 5 vs. Kimi K2 0905
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Overview
Kimi K2 0905 was released 9 months before Claude Sonnet 5.
 Claude Sonnet 5 |  Kimi K2 0905 | |
|---|---|---|
Model Provider The organization behind this AI's development | Anthropic | MoonshotAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 262.1K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 100.4K tokens |
Release Date When this model first became publicly available | June 30, 2026 27 days ago June 30th, 2026 | September 4, 2025 10 months ago September 4th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | December 31, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Claude Sonnet 5 | Kimi K2 0905 | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File | 📝Text |
Reasoning Controls Defaults and configurable reasoning effort | Enabled by defaultEffort: Max, Extra High, High, Medium, LowDefault: High | Not reported |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Claude | Other |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured OutputReasoning ModeContent Moderation |
Open Source Model availability | Proprietary | Available on HuggingFace → |
Pricing
Claude Sonnet 5 is roughly 3.3x more expensive compared to Kimi K2 0905 for input tokens and roughly 4.0x more expensive for output tokens.
| Claude Sonnet 5 | Kimi K2 0905 | |
|---|---|---|
Input Token Cost Cost per million input tokens | $2.00 per million tokens | $0.60 per million tokens |
Output Token Cost Cost per million output tokens | $10.00 per million tokens | $2.50 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | Not specified |
Cache Read Cost Cost to reuse cached input tokens | $0.20 per million tokens | Not specified |
Cache Write Cost Cost to write input tokens to the cache | $2.50 per million tokens | Not specified |
1-Hour Cache Write Cost Cost to cache input tokens for one hour | $4.00 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Claude Sonnet 5 and Kimi K2 0905.
| Claude Sonnet 5 | Kimi K2 0905 | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 53.4 (Artificial Analysis index; higher is better) | Benchmark not available. |
Coding Index Programming performance across independent evaluations | 71.5 (Artificial Analysis index; higher is better) | Benchmark not available. |
Agentic Index Ability to complete multi-step agentic tasks | 46.7 (Artificial Analysis index; higher is better) | Benchmark not available. |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,345 Elo (#3 in Game Dev (59.9% win rate)) | 1,132 Elo (#81 in Website (48.3% win rate)) |
At a Glance
Quick overview of what makes Claude Sonnet 5 and Kimi K2 0905 unique.
Claude Sonnet 5 by Anthropic understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $2.00/M input and $10.00/M output tokens. Includes built-in content moderation for safer outputs. Released June 30th, 2026.Kimi K2 0905 by MoonshotAI can use external tools and APIs, generates structured data. It can handle standard conversations with its 262.1K token context window. Reasonably priced at $0.60/M input and $2.50/M output tokens. Released September 4th, 2025.Explore More Comparisons
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Models optimized for creative writing
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Technical analysis and explanations
🔬Science
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