Claude Sonnet 4.5
language modelAnthropic
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Key facts
| Made by | Anthropic |
|---|---|
| Type | language model |
| Released | September 29, 2025 |
| Reads at once | 1,000,000 tokens |
| Price (API, per million tokens) | $3 in · $15 out |
| Input → output | text, image, file → text |
Questions about Claude Sonnet 4.5
Who makes Claude Sonnet 4.5?
Claude Sonnet 4.5 is made by Anthropic.
When was Claude Sonnet 4.5 released?
We first saw Claude Sonnet 4.5 listed on September 29, 2025.
How much does Claude Sonnet 4.5 cost?
Through OpenRouter it costs $3 per million input tokens and $15 per million output tokens. Prices change, so check the provider before you build on it.
How much text can Claude Sonnet 4.5 read at once?
Up to 1,000,000 tokens, roughly 750K words.
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