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Claude Sonnet 4.5: AI Large Language Models

Claude Sonnet 4.5 is Anthropic's state-of-the-art model offering high intelligence, speed, and efficiency for code generation, writing, and logical analysis. Supports text and image inputs. Token-based pricing: $1.80/M input tokens, $9.00/M output tokens. Two endpoints: standard async (/claude-sonnet-4-5) and live streaming (/claude-sonnet-4-5/stream) via SSE.

Interactive model controls

Claude Sonnet 4.5 is Anthropic's state-of-the-art model offering high intelligence, speed, and efficiency for code generation, writing, and logical analysis. Supports text and image inputs. Token-based pricing: $1.80/M input tokens, $9.00/M output tokens. Two endpoints: standard async (/claude-sonnet-4-5) and live streaming (/claude-sonnet-4-5/stream) via SSE.

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Overview

About this model

Claude Sonnet 4.5 is Anthropic's state-of-the-art model offering high intelligence, speed, and efficiency for code generation, writing, and logical analysis. It strikes the perfect balance between reasoning depth and execution speed. Pricing: $1.80 per million input tokens and $9.00 per million output tokens.

1Code Generation: Rapid prototyping, writing tests, and implementing structured features.
2Text Generation: High-quality marketing copy, editing, translation, and structured extraction.
3Conversational Interfaces: Power responsive chatbots, assistants, and interactive workflows.
4Analysis: Parse spreadsheets, analyze reports, and extract key insights.
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Pricing & Value

Cost analysis

muapiapp$1.80/M input tokens, $9.00/M output tokens

Token-based billing. Minimum $0.00035 per call. ~60% of official Anthropic pricing.

Anthropic (official)~$3.00/M input tokens, ~$15.00/M output tokens

Official pricing via api.anthropic.com.

Fal.aiNot available

Claude Sonnet 4.5 is not available on Fal.ai.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Promptstring

The user message or instruction.

Default ValueReview this code and suggest improvements for performance and readability.
Image URLstring

Optional image URL for multimodal requests.

Default Valueundefined
System Promptstring

Optional system-level instruction to guide model behavior.

Default ValueYou are an expert software architect.
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Implementation Guide

Developer documentation

Standard (Async)

POST /api/v1/claude-sonnet-4-5 — returns request_id, poll for result via /api/v1/predictions/{id}/result.

Streaming (SSE)

POST /api/v1/claude-sonnet-4-5/stream — returns a live SSE stream. Each chunk: data: {"choices":[{"delta":{"content":"text"}}]}, ending with data: [DONE].

See Streaming Documentation for full code examples.

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Common Questions

Frequently asked

How is pricing calculated?

Pricing is token-based: $1.80 per million input tokens and $9.00 per million output tokens. The minimum charge per call is $0.00035. Actual cost is deducted after each call based on token counts returned by the model.

Does Claude Sonnet 4.5 support images?

Yes. Pass an image_url in the request body to include an image as part of the user message.