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Claude Opus 4.8: AI Large Language Models

Claude Opus 4.8 is Anthropic's most 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-4-8) and live streaming (/claude-opus-4-8/stream) via SSE.

Interactive model controls

Claude Opus 4.8 is Anthropic's most 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-4-8) and live streaming (/claude-opus-4-8/stream) via SSE.

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Overview

About this model

Claude Opus 4.8 is Anthropic's most capable model, optimized for complex coding, long-context reasoning, and agentic workflows. It delivers stronger debugging, better code review, and more reliable large-context performance than Sonnet — ideal for the most 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 the highest 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 4.8 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-4-8 — returns request_id, poll for result via /api/v1/predictions/{id}/result.

Streaming (SSE)

POST /api/v1/claude-opus-4-8/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 vs Sonnet?

Use Opus for the most complex tasks requiring deep reasoning, large codebases, or maximum reliability. Use Sonnet for faster responses and everyday tasks — it offers a better cost/performance trade-off for most use cases.

Does Claude Opus 4.8 support images?

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