Activefrontierllm Proprietary

Claude Sonnet 4.5

by Anthropic· Released February 2025· Cutoff April 2024

Claude Sonnet 4.5 is Anthropic's most intelligent model, offering state-of-the-art performance across a wide range of tasks including coding, analysis, and creative writing. It balances high capability with improved speed and efficiency, making it suitable for complex enterprise applications.

Official Site API Docs

Input cost

$3.00 per 1M tokens

Output cost

$15.00 per 1M tokens

Context window

200K tokens

Max output

8192 tokens

Modalities

textimage

License

proprietary

Capabilities

Function CallingVisionCode GenerationStreamingJSON ModeTool UseMultilingual

Best For

Complex reasoning, coding, and analysis tasks requiring high accuracy and nuanced understanding.

Strengths

Top-tier performance on reasoning and coding benchmarks
Large 200K token context window
Strong instruction following and safety alignment
Multilingual proficiency

Limitations

Higher cost compared to smaller models
Slower inference than Haiku or Sonnet 4
Not suitable for real-time applications requiring low latency

Use Cases

Advanced software development and debugging

Complex data analysis and report generation

Legal document review and summarization

Scientific research assistance

Creative writing and content generation

Customer support automation for complex queries

Multilingual translation and localization

Improvements Over Previous Model

Significantly improved reasoning and coding performance over Claude Sonnet 4
Larger context window (200K vs 100K tokens)
Enhanced vision capabilities with better image understanding
Improved safety and alignment with reduced hallucination rates
Faster inference speed compared to Claude Opus 4
Lower pricing than Claude Opus 4 ($3/$15 vs $15/$75 per 1M tokens)

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