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Anthropic: Claude Opus 5.5 vs Anthropic: Claude Sonnet 5.5

Anthropic: Claude Sonnet 5.5 is 2× cheaper for the sample workload; both have the same context window.

MetricAnthropic: Claude Opus 5.5Anthropic: Claude Sonnet 5.5
Model IDanthropic/claude-opus-5.5anthropic/claude-sonnet-5.5
Prompt price$4.00 / 1M tokens$2.00 / 1M tokens
Completion price$20.00 / 1M tokens$10.00 / 1M tokens
Context1,000,000 tokens1,000,000 tokens
Tool calling✓✓
Structured outputs✓✓
Reasoning✓✓
Response format✓✓
Web search––
Input modalitiestext, image, filetext, image, file
Output modalitiestexttext
Added2026-09-222026-09-28

Sample workload

Chat app: 1,000 prompt + 500 completion tokens × 100 requests per day.

CostAnthropic: Claude Opus 5.5Anthropic: Claude Sonnet 5.5
Per day$1.40$0.70
Per 30 days$42.00$21.00

Difference: $0.70 per day and $21.00 per 30 days.

Data updated 2026-10-30