Model comparison

Claude Opus 4.5 vs Claude Sonnet 5.5

Compare Claude Opus 4.5 (Anthropic) and Claude Sonnet 5.5 (Anthropic) by price, context, capabilities, and latency.

Which should you pick?

Price: Claude Sonnet 5.5 is cheaper ($2 / 1M tokens input / $10 / 1M tokens output) vs Claude Opus 4.5 ($5 / 1M tokens input / $25 / 1M tokens output).
Context: Claude Sonnet 5.5 has the larger context window (1M tokens).

Side by side

Claude Opus 4.5 vs Claude Sonnet 5.5 — full comparison

Compare price, provider, context, capabilities, latency, and source basis.

Model	Provider	Input	Output	Context	Capabilities	Best for	Latency	Status	Source
Claude Opus 4.5anthropic/claude-opus-4.5	Anthropic	$5 / 1M tokens	$25 / 1M tokens	200k	StreamingTool callingJSON modeVision	image understanding, multimodal chat	2108-3510ms	Catalog	Platform curated
Claude Sonnet 5.5anthropic/claude-sonnet-5.5	Anthropic	$2 / 1M tokens	$10 / 1M tokens	1M	StreamingTool callingJSON modeVision	image understanding, multimodal chat	1230-2392ms	Catalog	Platform curated

FAQ

Claude Opus 4.5 vs Claude Sonnet 5.5 FAQ

Is Claude Opus 4.5 or Claude Sonnet 5.5 cheaper?

Claude Sonnet 5.5 is cheaper ($2 / 1M tokens input / $10 / 1M tokens output) vs Claude Opus 4.5 ($5 / 1M tokens input / $25 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.

Which has a larger context window, Claude Opus 4.5 or Claude Sonnet 5.5?

Claude Sonnet 5.5 is larger (1M tokens) vs 200k tokens.

Claude Opus 4.5 vs Claude Sonnet 5.5 for Vision: which should I pick?

Both target Vision. Pick Claude Sonnet 5.5 to optimize cost, or Claude Sonnet 5.5 for the longer context window. Test both on real prompts before committing production traffic.

Claude Opus 4.5 details Claude Sonnet 5.5 details Pricing calculator OpenAI-compatible quickstart

Related comparisons

Compare other models

Claude Sonnet 5.5 vs ‌Gemini 4 Argon