Using Claude Sonnet 4.5 on Replicate API

Implementation guide · Claude 4.5 · Anthropic

Serverless

Replicate API exposes Claude Sonnet 4.5 through model ID anthropic/claude-4.5-sonnet. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-07-26. Next refresh: weekly.

Quick Start

1
Create an account at Replicate API and generate an API key.
2
Use the Replicate API SDK or REST API to call anthropic/claude-4.5-sonnet — see the documentation for request format.
3
You'll be billed $3.00/1M input, $15.00/1M output tokens. See full pricing.

API Portal Documentation Pricing Model Card

Code Examples

Install

pip install replicate

API key

REPLICATE_API_TOKEN

Model ID

anthropic/claude-4.5-sonnet

Replicate uses "owner/model-name" format (e.g. "meta/meta-llama-3-8b-instruct") for the latest version, or "owner/model-name:version-sha" to pin to a specific version. The REST endpoint splits owner and model-name into the path: /v1/models/{owner}/{model-name}/predictions.

import replicate

# reads REPLICATE_API_TOKEN from env
# anthropic/claude-4.5-sonnet format: "owner/model-name" (latest version) or "owner/model-name:version-hash"
output = replicate.run(
    "anthropic/claude-4.5-sonnet",
    input={"prompt": "Hello"}
)
# Output is a list or generator depending on the model
print("".join(output))

Pricing on Replicate API

Type	Price (per 1M)
Input tokens	$3.00
Output tokens	$15.00

Capabilities

VisionMultimodalReasoningJSON / Tool useStructured Outputs

About Claude Sonnet 4.5

Claude Sonnet 4.5 is Anthropic's Claude 4.5 model with multimodal text and image input and an optional reasoning mode. It offers a 200K-token context window and scores 86 on MMLU PRO.

Full model details →

Model Specs

Released2025-09-29

Context200k

ArchitectureDecoder Only

Knowledge cutoff2025-12

Replicate

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