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Claude Sonnet 5.5: AI Large Language Models

Claude Sonnet 5.5 is Anthropic's faster, cost-efficient model for everyday coding, agents, and knowledge work. Supports text and image inputs. Token-based pricing: $2.00/M input tokens, $10.00/M output tokens. Two endpoints: standard async (/claude-sonnet-5-5) and live streaming (/claude-sonnet-5-5/stream) via SSE.

Interactive model controls

Claude Sonnet 5.5 is Anthropic's faster, more cost-efficient upgrade to Sonnet 5, built for everyday coding, agentic workflows, knowledge work, and visual understanding. Supports text and image inputs. Token-based pricing: $2.00/M input tokens, $10.00/M output tokens. Two endpoints: standard async (/claude-sonnet-5-5) and live streaming (/claude-sonnet-5-5/stream) via SSE.

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Overview

About this model

Claude Sonnet 5.5 is Anthropic's faster, more cost-efficient upgrade to Sonnet 5, built for everyday coding, well-scoped agents, knowledge work, and visual understanding. It runs more than 30% faster than Sonnet 5 and typically uses fewer tokens per task. Pricing: $2.00 per million input tokens and $10.00 per million output tokens — matches official Anthropic pricing.

1Everyday Coding: Generate, debug, and review code across large codebases.
2Agentic Workflows: Drive multi-step agents that batch tool calls efficiently.
3Knowledge Work: Analyze documents, connect information across sources, and produce structured outputs.
4Visual Understanding: Pass an image_url alongside your prompt for image-grounded answers.
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Pricing & Value

Cost analysis

muapiapp$2.00/M input tokens, $10.00/M output tokens

Token-based billing. Minimum $0.0004 per call. Matches official Anthropic pricing.

Anthropic (official)$2.00/M input tokens, $10.00/M output tokens

Official pricing via api.anthropic.com.

Fal.aiNot available

Claude Sonnet 5.5 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 pull request diff and list the riskiest changes first.
Image URLstring

Optional image URL for multimodal requests.

Default Valueundefined
System Promptstring

Optional system-level instruction to guide model behavior.

Default ValueYou are a senior code reviewer.
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Implementation Guide

Developer documentation

Standard (Async)

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

Streaming (SSE)

POST /api/v1/claude-sonnet-5-5/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: $2.00 per million input tokens and $10.00 per million output tokens. The minimum charge per call is $0.0004. Actual cost is deducted after each call based on token counts returned by the model.

When should I use Sonnet 5.5 vs Opus 5.5?

Use Sonnet 5.5 for fast everyday coding, agents, and knowledge work at a lower price. Use Opus 5.5 for the most complex tasks that need maximum reasoning depth.

Does Claude Sonnet 5.5 support images?

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