Claude Sonnet 4.5

anthropic/claude-sonnet-4.5

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...

InputFileImageText
OutputText
Input / Outputclub$3.18 / $15.9per 1M tokens · USD
Context window1Mtoken
Maximum output64Ktoken

Pricing

Current model usage rates. Choose your plan to see its published prices.

Pricing
UsagePricing
InputUS$3.18/ 1M token
InputInput length ≥ 200,001 tokensUS$6.36/ 1M token
Cache readUS$0.318/ 1M token
Cache readInput length ≥ 200,001 tokensUS$0.636/ 1M token
Cache writeUS$3.975/ 1M token
Cache writeInput length ≥ 200,001 tokensUS$7.95/ 1M token
Cache write · 1 hUS$6.36/ 1M token
Cache write · 1 hInput length ≥ 200,001 tokensUS$12.72/ 1M token
OutputUS$15.9/ 1M token
OutputInput length ≥ 200,001 tokensUS$23.85/ 1M token

Membership and model usage are billed separately. Compare plans

Capabilities

Input
FileImageText
Output
Text
Context window
1,000,000 token
Maximum output
64,000 token

Providers

Model supply available through Vecbase.

Via OpenRouter

Access is subject to your account’s permissions and model availability.

Frequently asked questions

What is Claude Sonnet 4.5, and who develops it?

Claude Sonnet 4.5 is a model from Anthropic. Its model ID on Vecbase is anthropic/claude-sonnet-4.5. 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...

How much does Claude Sonnet 4.5 cost on Vecbase?

For Claude Sonnet 4.5, the Club plan lists USD 3.18 per 1 million input tokens and USD 15.9 per 1 million output tokens, as of 10/22/2026, 9:29:04 PM UTC. See the pricing table for cache rates, input-length tiers and other usage types. Membership fees are separate.

How many tokens fit in Claude Sonnet 4.5’s context window?

Claude Sonnet 4.5 has a context window of 1,000,000 tokens. Input and output must fit within the limits of the API you use.

What is the maximum output length for Claude Sonnet 4.5?

Claude Sonnet 4.5 can generate up to 64,000 tokens per response. Your API or request settings may set a lower limit.

Can Claude Sonnet 4.5 call tools in an agent workflow?

Yes. Claude Sonnet 4.5 supports tool calling. Your application provides the tool definitions and runs the tools the model requests.

Does Claude Sonnet 4.5 support structured outputs?

Yes. Claude Sonnet 4.5 supports structured output. Set the required format in your API request and check the returned data before using it.

Which input and output formats does Claude Sonnet 4.5 support?

Claude Sonnet 4.5 accepts File, Image, and Text and produces Text.

Which providers make Claude Sonnet 4.5 available through Vecbase?

Vecbase offers Claude Sonnet 4.5 through OpenRouter. Availability may vary by provider.

Which model ID should an agent use to request Claude Sonnet 4.5?

Use anthropic/claude-sonnet-4.5 as the model identifier for Claude Sonnet 4.5. See Vecbase’s API documentation for authentication, required inputs and supported request formats.

What does an agent need to access Claude Sonnet 4.5 through Vecbase?

To use Claude Sonnet 4.5, you need an authenticated account with the required permissions, sufficient balance and the relevant capability enabled. See the documentation for setup.

Is a release date available for Claude Sonnet 4.5?

We do not yet have a confirmed release date for Claude Sonnet 4.5.

Which models can I compare with Claude Sonnet 4.5 on Vecbase?

You can compare Claude Sonnet 4.5 with Claude Haiku Latest (anthropic/claude-haiku-latest), Claude Sonnet Latest (anthropic/claude-sonnet-latest), and Claude Opus Latest (anthropic/claude-opus-latest). Check their capabilities and prices to find the best fit for your task.