modelpick

Claude Sonnet 5.5 vs Seed 2.0 Pro pricing

Prices

Claude Sonnet 5.5 and Seed 2.0 Pro prices, USD per 1M tokens
USD per 1M tokensClaude Sonnet 5.5Seed 2.0 Pro
Input$2.00$0.50
Output$10.00$3.00
Cache read$0.10$0.10
Cache write$2.50Not published
Batch input$1.00$0.25
Batch output$5.00$1.50

Verified against the provider's official pricing page on Oct 9, 2026. Official pricing page

Monthly cost by workload

WorkloadClaude Sonnet 5.5Seed 2.0 Pro
Chatbot1,000 in / 500 out tokens, 10,000 requests a day$2,100/mo$600.00/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day$3,150/mo$825.00/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input$1,320/mo$450.00/mo

Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.

Context and capabilities

Claude Sonnet 5.5Seed 2.0 Pro
Context1,000,000 tokens256,000 tokens
Max output128,000 tokens128,000 tokens
Inputtext, image, pdftext, image, video
Tool callingYesYes
ReasoningYesYes
Structured outputsYesNo

Questions

What is the price difference between Claude Sonnet 5.5 and Seed 2.0 Pro?
Claude Sonnet 5.5: $2.00 per 1M input tokens and $10.00 per 1M output tokens. Seed 2.0 Pro: $0.50 per 1M input tokens and $3.00 per 1M output tokens. For the Chatbot workload (1,000 in / 500 out tokens, 10,000 requests a day), that is about $2,100 per month for Claude Sonnet 5.5 and $600.00 for Seed 2.0 Pro.
Which has the longer context window, Claude Sonnet 5.5 or Seed 2.0 Pro?
Claude Sonnet 5.5 has the longer context window: up to 1,000,000 tokens, compared with 256,000 for Seed 2.0 Pro.
Do Claude Sonnet 5.5 and Seed 2.0 Pro have prompt caching and batch prices?
Claude Sonnet 5.5: cached input $0.10 per 1M tokens; batch $1.00 per 1M input tokens and $5.00 per 1M output tokens. Seed 2.0 Pro: cached input $0.10 per 1M tokens; batch $0.25 per 1M input tokens and $1.50 per 1M output tokens.

More comparisons