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Kimi K2 (0905) vs Claude Sonnet 5

At a glance

September 2025 checkpoint of Kimi K2 with improved capabilities.

262K ctx$0.60/$2.50 per M

Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.

801M ctx$2.00/$10.00 per M#26/92
Agent Demos
All agent demos

No shared agent demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
No benchmarks available

This model hasn't been benchmarked yet.

Reasoning
CI 72.7-84.7
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI80.1
Reasoning & Knowledge
Graduate Science90.5%Factual Recall25.0%
Math
Competition Math94.7%
Specs
262K
Context
100K
Max output
Sep 2025
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input70%$0.60/M tokens
Output75%$2.50/M tokens
Live pricing, shown before you run
Input$2.00/M tokens
Output$10.00/M tokens
Cache read$0.20/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Chat with Kimi K2 (0905)Go to model
Chat with Claude Sonnet 5Go to model
Frequently Asked Questions: Kimi K2 (0905) vs Claude Sonnet 5▼

Which is better, Kimi K2 (0905) or Claude Sonnet 5?

▼

Both Kimi K2 (0905) and Claude Sonnet 5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Kimi K2 (0905) or Claude Sonnet 5?

▼

Kimi K2 (0905) has a lower blended cost. Kimi K2 (0905): $0.60 input / $2.50 output. Claude Sonnet 5: $2.00 input / $10.00 output.

Which has a larger context window, Kimi K2 (0905) or Claude Sonnet 5?

▼

Claude Sonnet 5 has a larger context window: Kimi K2 (0905) supports 262K tokens vs Claude Sonnet 5 at 1M tokens.

Do both Kimi K2 (0905) and Claude Sonnet 5 support vision?

▼

Claude Sonnet 5 supports vision/image input, but Kimi K2 (0905) does not.

What are the key differences between Kimi K2 (0905) and Claude Sonnet 5?

▼

Key differences: Kimi K2 (0905) is significantly cheaper; only Claude Sonnet 5 supports vision input; only Claude Sonnet 5 offers extended reasoning mode. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Kimi K2 (0905) and Claude Sonnet 5 for free on idapt.app to see which performs better for your specific needs.

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