Claude Sonnet 4.5

Latest Claude Sonnet with improved reasoning and extended thinking.

claude-sonnet-4-5
STABLEGet StartedView uptime
1,000,000 context
Released September 29, 2025
Starting at $3.00/M input tokens (tiered)
Starting at $15.00/M output tokens (tiered)
Streaming
Vision
Tools
Reasoning
JSON Output
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All Providers for Claude Sonnet 4.5

LLM Gateway routes requests to the best providers that are able to handle your prompt size and parameters.

S

OpenRouter
Context: 1M
Input
$3
/M tokens
Cache Read
$0.3
/M tokens
Output
$15
/M tokens
Cache Write 5m
$3.75
/M tokens
Cache Write 1h
$6
/M tokens
Tiered Pricing
IN
CACHED
OUT
≤200K tokens
$3
$0.3
$15
>200K tokens
$6
$0.6
$22.5
+ $0.010 per search
Get Started
Anthropic
Context: 200k
Input
$3
/M tokens
Cache Read
$0.3
/M tokens
Output
$15
/M tokens
Cache Write 5m
$3.75
/M tokens
Cache Write 1h
$6
/M tokens
+ $0.010 per search
Get Started

S

AvalAI
Context: 200k
Input
$3
/M tokens
Cache Read
$1.5
/M tokens
Output
$15
/M tokens
Get Started

S

Hormouz
Context: 200k
Input
$3
/M tokens
Cache Read
$1.5
/M tokens
Output
$15
/M tokens
Get Started

S

Metis
Context: 200k
Input
$3
/M tokens
Cache Read
$1.5
/M tokens
Output
$15
/M tokens
Get Started
AWS Bedrock
Context: 200k
Input
$3
/M tokens
Cache Read
$0.3
/M tokens
Output
$15
/M tokens
Cache Write 5m
$3.75
/M tokens
Cache Write 1h
$6
/M tokens
Get Started
Vertex AI (Anthropic)
Context: 200k
Input
$3
/M tokens
Cache Read
$0.3
/M tokens
Output
$15
/M tokens
Get Started

Frequently asked questions

What is Claude Sonnet 4.5?

Latest Claude Sonnet with improved reasoning and extended thinking. You can access it through LLM Gateway's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.

How much does Claude Sonnet 4.5 cost?

Pricing for Claude Sonnet 4.5 on LLM Gateway starts at $3.00 per million input tokens and $15.00 per million output tokens, depending on the provider. The pricing table above always reflects the current per-provider rates.

What is the context length of Claude Sonnet 4.5?

Claude Sonnet 4.5 supports a context window of up to 1,000,000 tokens on its largest provider deployment.

Which providers serve Claude Sonnet 4.5?

Claude Sonnet 4.5 is served by OpenRouter, Anthropic, AvalAI, Hormouz, Metis, AWS Bedrock, Vertex AI (Anthropic) through LLM Gateway. Requests are automatically routed to the best available provider, with fallback when a provider has issues.

Does Claude Sonnet 4.5 support tool calling and structured outputs?

Yes. Claude Sonnet 4.5 supports both tool (function) calling and structured JSON outputs through LLM Gateway.

When was Claude Sonnet 4.5 released?

Claude Sonnet 4.5 was released on September 29, 2025.