AnthropicReleased on Sep 29, 2025

Claude Sonnet 4.5: Benchmarks, Pricing & Context Window

Claude Sonnet 4.5 is a language model from Anthropic, released in September 2025, with multimodal input.

Claude Sonnet 4.5 is the best coding model in the world. It's the strongest model for building complex agents. It’s the best model at using computers. And it shows substantial gains in reasoning and math. Highest intelligence across most

Input
TextImageAudioVideo
Output
Text
Speed
Latency p952.69s
Throughput P9542.0char/s
Cost
$4.33/ 1M · 8:1 in:out
$3.00 in · $15.0 out

Claude Sonnet 4.5 pricing

Providers

Claude Sonnet 4.5 starts at $3.00 per million input tokens and $15.00 per million output tokens via Anthropic.

ProviderInput $/MOutput $/MMax InputMax OutputLatency p95 sThroughput P95QuantInputOutput
Anthropic logoAnthropic
$3.00$15.00200.0K64.0K
2.69
42 c/s
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Claude Sonnet 4.5 API

API access coming soon

Claude Sonnet 4.5 will be available through our gateway shortly.

Claude Sonnet 4.5 examples

Recent arena outputs from Claude Sonnet 4.5, picked from the highest-ranked matchups.

Claude Sonnet 4.5 license

Claude Sonnet 4.5 is released under the Proprietary license, which restricts commercial use, has a knowledge cutoff of January 2025.

License
Proprietary
Non-commercial
Knowledge cutoff
January 2025

Proprietary license - usage restrictions apply

FAQ

Common questions about Claude Sonnet 4.5.

When was Claude Sonnet 4.5 released?

Claude Sonnet 4.5 was released on September 29, 2025 by Anthropic. This is the official Claude Sonnet 4.5 release date tracked on LLM Stats.

Is Claude Sonnet 4.5 available via API?

Yes, Claude Sonnet 4.5 is available via API. See the official documentation for authentication and endpoint details. It is served by 1 provider tracked on LLM Stats.

Who created Claude Sonnet 4.5?

Claude Sonnet 4.5 was created by Anthropic.

What is the license for Claude Sonnet 4.5?

Claude Sonnet 4.5 is released under the Proprietary license.

What is the knowledge cutoff date for Claude Sonnet 4.5?

Claude Sonnet 4.5 has a knowledge cutoff of January 2025, meaning it was trained on data up to that point and may not know about events after it.

Is Claude Sonnet 4.5 multimodal?

Yes, Claude Sonnet 4.5 is multimodal and can accept both text and images as input.

Where can I use Claude Sonnet 4.5?

Claude Sonnet 4.5 is available through 1 provider including Anthropic.

Where is the Claude Sonnet 4.5 paper or technical report?

Claude Sonnet 4.5 has a paper or technical report available at https://www.anthropic.com/news/claude-sonnet-4-5. Use that source for architecture, training, release and evaluation details.