Claude Opus 5.5 vs Claude Sonnet 5.5

Claude Opus 5.5 from Anthropic and Claude Sonnet 5.5 from Anthropic, side by side. Every figure comes from the model registry. No markup on model usage: you pay the provider's list price.

Side-by-side comparison of Claude Opus 5.5, Claude Sonnet 5.5

Attribute	Claude Opus 5.5	Claude Sonnet 5.5
Provider	Anthropic	Anthropic
Model id	anthropic/claude-opus-5-5	anthropic/claude-sonnet-5-5
Status	Available via Safeguard	Available via Safeguard
Input / 1M tokens	$4	$2
Output / 1M tokens	$20	$10
Price notes	Base price, full 1M context at standard rate. Cache hits $0.20/1M. Batch 50% off. US-only inference 1.1x.	Base price, full 1M context at standard rate. Cache hits $0.10/1M. Batch 50% off.
Context	1M	1M
Parameters	Not published	Not published
Max output	128,000 tokens	128,000 tokens
Modality	Text and image	Text and image
Weights	Closed	Closed
Zero data retention	Available	Available
Prompts go to	Anthropic (global routing by default)	Anthropic (global routing by default)
Retention	Not used for model training without express permission, per Anthropic's API retention doc, conversation content is not retained by default except for Covered Models that require 30-day retention, flagged content and legal holds can be kept longer	Not used for model training without express permission, per Anthropic's API retention doc, conversation content is not retained by default except for Covered Models that require 30-day retention, flagged content and legal holds can be kept longer
Region	Global by default, US-only inference via inference_geo at 1.1x pricing (Claude 4.6 and later)	Global by default, US-only inference via inference_geo at 1.1x pricing (Claude 4.6 and later)
Price checked	2026-10-08	2026-10-08

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