How much does Anthropic: Claude Sonnet 4.5 cost per 1M tokens?

Anthropic: Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens on the standard tier. Cached input is $0.300 per 1M.

What is Anthropic: Claude Sonnet 4.5's context window?

Anthropic: Claude Sonnet 4.5 accepts up to 1,000,000 tokens in a single request, and can return up to 64,000 output tokens.

Is there a cheaper OpenRouter model than Anthropic: Claude Sonnet 4.5?

Yes. OpenAI: GPT-3.5 Turbo is $0.500 per 1M input tokens versus $3.00 for Anthropic: Claude Sonnet 4.5, with a 16,385 token context window.

Where does this Anthropic: Claude Sonnet 4.5 price come from?

From the OpenRouter catalogue, because OpenRouter does not publish machine-readable pricing. OpenRouter is a reseller, so its rate can differ from OpenRouter's own — verify before committing spend.

Anthropic: Claude Sonnet 4.5 pricing

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. Anthropic: Claude Sonnet 4.5 from OpenRouter costs $3.00 per 1M input tokens and $15.00 per 1M output tokens. Cached input is $0.300 per 1M. Context window 1,000,000 tokens.

API id anthropic/claude-sonnet-4.5 · OpenRouter · source · updated 2026-09-25 · general-purpose

$3.00

Input / 1M tokens

$15.00

Output / 1M tokens

$0.300

Cached input / 1M

Context window

Anthropic: Claude Sonnet 4.5 specifications

Provider: OpenRouter
API id: anthropic/claude-sonnet-4.5
Model type: general-purpose
Context window: 1M tokens
Max output: 64K tokens
Currency: USD
Price source: Provider API
Last checked: 2026-09-25

Claude Sonnet 4.5 across providers

The same model, priced by every seller we track. Ranked by the cost of 1M input + 1M output tokens, standard tier; savings measured against buying from the vendor directly.

Provider	Input /1M	Cached /1M	Output /1M	1M in + 1M out	vs vendor
AnthropicVendorCheapest	$3.00	$0.300	$15.00	$18.00	—
OpenRouterHostviewing	$3.00	$0.300	$15.00	$18.00	—

What Anthropic: Claude Sonnet 4.5 costs in practice

Estimated cost at common usage volumes
Workload	Input tokens	Output tokens	Estimated cost
Short chat turn	1,000	500	$0.01
Document summary	50,000	2,000	$0.18
1M tokens in, 200K out	1,000,000	200,000	$6.00

Estimates use the standard tier and ignore caching discounts, so real bills with repeated prompt prefixes are typically lower.

Common questions

How much does Anthropic: Claude Sonnet 4.5 cost per 1M tokens?: Anthropic: Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens on the standard tier. Cached input is $0.300 per 1M.
What is Anthropic: Claude Sonnet 4.5's context window?: Anthropic: Claude Sonnet 4.5 accepts up to 1,000,000 tokens in a single request, and can return up to 64,000 output tokens.
Is there a cheaper OpenRouter model than Anthropic: Claude Sonnet 4.5?: Yes. OpenAI: GPT-3.5 Turbo is $0.500 per 1M input tokens versus $3.00 for Anthropic: Claude Sonnet 4.5, with a 16,385 token context window.
Where does this Anthropic: Claude Sonnet 4.5 price come from?: From the OpenRouter catalogue, because OpenRouter does not publish machine-readable pricing. OpenRouter is a reseller, so its rate can differ from OpenRouter's own — verify before committing spend.

Head-to-head comparisons

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