claude-sonnet-5

Anthropicclaude-sonnet-5

Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max, and x-high), a 1M-token context window, and text, image, and file inputs. Sonnet 5 uses an updated tokenizer and includes real-time cyber safeguards that block certain high-risk dual-use activities.

API Pricing

Price typeBilling expression
Official price
Base pricingPricing tier: base
  • Input usage × $2.00
  • Output usage × $10.00
  • Cached read × $0.20
  • Cache creation × $2.50
  • Cache creation (1 hour) × $4.00
Claude_Pro×0.880% of official list price
Base pricingPricing tier: base
  • Input usage × $1.60
  • Output usage × $8.00
  • Cached read × $0.16
  • Cache creation × $2.00
  • Cache creation (1 hour) × $3.20

Group multiplier: x0.8

Claude_Ultra×0.990% of official list price
Base pricingPricing tier: base
  • Input usage × $1.80
  • Output usage × $9.00
  • Cached read × $0.18
  • Cache creation × $2.25
  • Cache creation (1 hour) × $3.60

Group multiplier: x0.9

Official pricing is subject to the model provider's latest published pricing and may vary by request method or service region. Claude_Pro, Claude_Ultra — TokenByte channel pricing. Actual prices and availability reflect current platform data.

Model information

Model providerAnthropic
Model IDclaude-sonnet-5
Context window1000000
InputTextImage
OutputText

Frequently asked questions

01

What is Claude Sonnet 5.5?

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing polished documents, slides, and spreadsheets, and it writes and communicates more clearly than its predecessor.
02

How much does Claude Sonnet 5.5 cost?

Claude Sonnet 5.5 costs $2.00/M input tokens and $10.00/M output tokens, with separate rates for Cache Read at $0.10/M tokens, Cache Write at $2.50/M tokens, and Cache Write (1h) at $4.00/M tokens.
03

What is the context length of Claude Sonnet 5.5?

Claude Sonnet 5.5 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.