Anthropic
Claude Sonnet 4.5 Pricing, Specs & Alternatives
Listed under additional models on Anthropic's pricing page.
Latest changes
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Questions
How much does Claude Sonnet 4.5 cost
Claude Sonnet 4.5 lists $3 per 1M input tokens and $15 per 1M output tokens, checked Nov 9, 2026 on platform.claude.com.
When was Claude Sonnet 4.5 released
Sep 29, 2025, per platform.claude.com.
What is the Claude Sonnet 4.5 context window
200K tokens, per platform.claude.com, read Nov 9, 2026.
Who makes Claude Sonnet 4.5
Anthropic.
What are alternatives to Claude Sonnet 4.5
Claude Haiku 4.5, Claude Opus 4.1, Claude Opus 4.5, Claude Opus 4.6, Claude Opus 4.7.