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Claude Opus 5: AI Large Language Models

Run Claude Opus 5 API on Muapi. Anthropic's flagship model for deep reasoning and code generation. Try free — pay per token, no subscription. Claude Opus 5 is Anthropic's flagship most capable model, offering state-of-the-art performance for complex coding, reasoning, and multimodal analysis. Supports text and image inputs. Token-based pricing: $3.00/M input tokens, $15.00/M output tokens. Two endpoints: standard async (/claude-opus-5) and live streaming (/claude-opus-5/stream) via SSE.

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Overview

About this model

Claude Opus 5 is Anthropic's most capable flagship model, delivering unmatched reasoning, expert-level coding assistance, and advanced multimodal image-plus-text analysis. Built with an enhanced reasoning engine and a 1-million-token context window, it excels at complex logic, multi-step agentic automation, architectural engineering, and deep document synthesis. Access elite AI capabilities with low token pricing on standard async (/claude-opus-5) and real-time streaming (/claude-opus-5/stream) endpoints.

1Complex Reasoning: Solve multi-step mathematical, logical, and strategic problems with maximum precision.
2Advanced Software Architecture: Design, refactor, debug, and review large software projects across file boundaries.
3Multimodal Visual Analysis: Parse complex technical charts, screenshots, UI mockups, and structured documents.
4Agentic Task Automation: Power complex autonomous agent loops with reliable instruction-following and tool use.
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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. Pay per generation with no subscription requirement.

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

Direct API subscription rates.

Fal.aiNot available

Claude Opus 5 is not hosted 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 ValueDraft a high-quality article about agentic coding workflows.
Image URLstring

Optional image URL for multimodal requests.

Default Valueundefined
System Promptstring

Optional system-level instruction to guide model behavior.

Default ValueYou are a professional copywriter.
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Implementation Guide

Developer documentation

Claude Opus 5 Integration Guide

Submit text and multimodal prompts using standard async or real-time streaming Server-Sent Events (SSE).

1. Standard (Async) Endpoint

POST /api/v1/claude-opus-5

Returns a request_id immediately. Poll /api/v1/predictions/{id}/result for completion status and output.

curl -X POST https://muapi.ai/api/claude-opus-5 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "Architect a high-performance distributed caching solution.",
    "system_prompt": "You are a principal systems architect."
  }'

2. Streaming (SSE) Endpoint

POST /api/v1/claude-opus-5/stream

Returns a chunked Content-Type: text/event-stream stream. SSE deltas match the format data: {"choices":[{"delta":{"content":"..."}}]}, ending with data: [DONE].

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Common Questions

Frequently asked

What is the context window size of Claude Opus 5?

Claude Opus 5 supports a context window of up to 1 million input tokens and supports up to 8,192 output tokens per generation request.

Does Claude Opus 5 accept visual inputs?

Yes, Claude Opus 5 is a multimodal model. You can supply an optional image_url parameter to analyze diagrams, code screenshots, UI wireframes, and documents.

How is billing structured for Claude Opus 5 on Muapi?

Pricing is strictly token-based: $3.00 per million input tokens and $15.00 per million output tokens, with a minimum execution cost of $0.0006 per call.

What is the difference between /claude-opus-5 and /claude-opus-5/stream?

The standard /api/v1/claude-opus-5 endpoint runs asynchronously, returning a task ID for background polling. The /api/v1/claude-opus-5/stream endpoint streams token deltas in real-time via SSE for interactive applications.

How do I specify system instructions for Claude Opus 5?

You can provide a system_prompt parameter in your request body to define the assistant persona, behavioral constraints, and output formatting rules.