Claude Sonnet 4.5
Balanced
The Sonnet that established the Claude 4 line as the default mid-tier choice. Still widely deployed where 4.6 hasn't been re-validated.
Claude Sonnet 4.5 is a multimodal AI model from Anthropic. It costs $3.000 per million input tokens and $15.000 per million output tokens (blended $6.600/M), with a 200,000-token context window.
INPUT
$3.000/M
per million input tokens
OUTPUT
$15.000/M
per million output tokens
CONTEXT
200,000
tokens
What it is good at
- Strong coding for the price
- 1M context
- Solid vision
- Wide ecosystem support
Typical use cases
- Mid-cost production chat
- Existing Sonnet 4.5 pipelines
- Document Q&A
Benchmarks
vs. best public score
Hand-curated from each provider's published reports and public leaderboards. Methodology varies across sources, treat as directional rather than authoritative.
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Frequently asked questions
How much does Claude Sonnet 4.5 cost?
Claude Sonnet 4.5 costs $3.000 per million input tokens and $15.000 per million output tokens, for a blended reference rate of $6.600 per million tokens.
What is Claude Sonnet 4.5's context window?
Claude Sonnet 4.5 supports up to 200,000 tokens of context in a single request.
What is Claude Sonnet 4.5 best for?
Claude Sonnet 4.5 is well suited to Strong coding for the price, 1M context and Solid vision.
Who makes Claude Sonnet 4.5?
Claude Sonnet 4.5 is developed and served by Anthropic. It was released in Sep 2025.