Claude Sonnet 5.5

Name: Claude Sonnet 5.5
Price: 2 USD
Author: Anthropic

Claude Sonnetv5.5Current

Anthropic(ai lab)

Released September 28, 2026

API Docs Playground

OpenTools Scorenormalized /100

14.6

Valuescore / $M

OpenTools Score

Context1M tokens

Price (In / Out)$2.00/M / $10.00/M

Training Cutoff2026-06

CategoryLarge Language Model

Max Output128K tokens

About Claude Sonnet 5.5

Claude Sonnet 5.5 is Anthropic's proprietary adaptive-reasoning model. The Claude API identifier is claude-sonnet-5-5. It accepts text and images, returns text, has a 1,000,000-token context window and a 128,000-token standard output limit. Anthropic lists standard API input and output pricing at $2 and $10 per million tokens.

Capabilities

textvisionreasoningcodingtool uselong contextcontext caching

Input Modalities

textimage

Output Modalities

text

Technical Details

API Identifier: claude-sonnet-5-5
Category: Large Language Model
Context Window: 1,000,000 tokens
Max Output Tokens: 128,000 tokens

Benchmarks

Performance scores for Claude Sonnet 5.5 across standard benchmarks.

Artificial Analysis Intelligence Index v4.3.2Artificial Analysis

55.9779549012591%

Artificial Analysis Intelligence Index v4.3.2Artificial Analysis

56.0001286580794%

Pricing

Token pricing for Claude Sonnet 5.5 API usage.

Input Tokens

$2.00/M

per million tokens

Output Tokens

$10.00/M

per million tokens

Pricing Calculator

Input tokens/month

Output tokens/month

Input cost$2.00

Output cost$5.00

Estimated monthly cost$7.00

Anthropic Claude API standard tier, USD per million tokens: $2 input, $10 output; 5-minute cache writes $2.50, 1-hour cache writes $4, cache reads $0.20. Batch API gives 50% off input and output. A 300K output limit is available only for Message Batches API with the output-300k-2026-03-24 beta header; standard maximum output is 128K. Provider and regional terms may vary.

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Building reliable, interpretable, and steerable AI systems

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Claude Haiku 5.5Current	1.0M	$0.10 / $0.50	reasoningvisiontool uselong context+1
Claude Fable 5.1Current	1.0M	$10.00 / $50.00	textvisionreasoningcoding+4
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Claude Sonnet 5Current	1.0M	$2.00 / $10.00	textvisionreasoningcoding+3
Claude Fable 5Current	1.0M	$10.00 / $50.00	textvisionreasoningcoding+3
Claude Opus 4.7Current	1.0M	$5.00 / $25.00	textvisioncodetool use