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Claude Opus 4.5: AI Large Language Models

Claude Opus 4.5 is Anthropic's highly capable model for complex coding, long-context reasoning, and agentic workflows. Supports text and image inputs. Token-based pricing: $3.00/M input tokens, $15.00/M output tokens. Two endpoints: standard async (/claude-opus-4-5) and live streaming (/claude-opus-4-5/stream) via SSE.

Interactive model controls

Claude Opus 4.5 is Anthropic's highly capable model for complex coding, long-context reasoning, and agentic workflows. Supports text and image inputs. Token-based pricing: $3.00/M input tokens, $15.00/M output tokens. Two endpoints: standard async (/claude-opus-4-5) and live streaming (/claude-opus-4-5/stream) via SSE.

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Overview

About this model

Claude Opus 4.5 is Anthropic's highly capable model, optimized for complex coding, long-context reasoning, and agentic workflows. It delivers strong debugging, code review, and large-context performance — ideal for demanding engineering and knowledge-work tasks. Pricing: $3.00 per million input tokens and $15.00 per million output tokens — significantly below official Anthropic pricing.

1Complex Coding: Tackle large refactors, architecture decisions, and multi-file engineering tasks.
2Deep Research: Synthesize and reason across long documents, papers, and extensive context.
3Agentic Pipelines: Power autonomous agents that require high reliability and reasoning depth.
4Knowledge Work: Complex analysis, legal review, financial modeling, and expert-level writing.
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Pricing & Value

Cost analysis

muapiapp$3.00/M input tokens, $15.00/M output tokens

Token-based billing. Minimum $0.0006 per call. ~60% of official Anthropic pricing.

Anthropic (official)~$5.00/M input tokens, ~$25.00/M output tokens

Official pricing via api.anthropic.com.

Fal.aiNot available

Claude Opus 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-opus-4-5 — returns request_id, poll for result via /api/v1/predictions/{id}/result.

Streaming (SSE)

POST /api/v1/claude-opus-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: $3.00 per million input tokens and $15.00 per million output tokens. The minimum charge per call is $0.0006. Actual cost is deducted after each call based on token counts returned by the model.

When should I use Opus 4.5 vs Opus 4.7/4.8?

All Opus models share the same pricing tier. Use whichever version best fits your requirements — Opus 4.8 is the latest iteration while Opus 4.5 is a highly stable previous version.

Does Claude Opus 4.5 support images?

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