Anthropic

Claude Sonnet 5.5

A fast, versatile model for coding, agents, and everyday work, with text and image input.

ActiveReleased September 26, 2026Knowledge cutoff June 30, 2026
Tool callingCan invoke external tools and APIs (function calling) mid-response.Structured outputCan return JSON or schema-constrained responses instead of free text.ReasoningUses extended thinking / chain-of-thought for harder multi-step problems.Effort controlLets you dial thinking depth (low / medium / high) to trade cost for quality.Fine-tuningSupports training a custom variant on your own data (vendor fine-tune API or self-hosted open weights).

Source: https://www.anthropic.com/claude-sonnet-5-5, https://docs.anthropic.com/en/docs/about-claude/pricing, https://www.anthropic.com/claude/sonnet, https://www.anthropic.com/transparency, Claude Sonnet 5.5 specifications and modalities

Price per 1M tokens
$2 in / $10 out
Context window1,000,000
Max output128,000
Cache read$0.2 / M
Batch discount-50%
Input
  • Text
  • Image
Output
  • Text

Pricing

Every billing leg from the live catalog, in USD per 1M tokens.

Billing legRateBatch
Input$2 / M$1 / M
Output$10 / M$5 / M
Cache read$0.2 / M$0.1 / M
Cache write · 5 min$2.5 / M$1.25 / M
Cache write · 1 hour$4 / M$2 / M

Cost calculator

Billing-grade math over the rate card above, including the thinking tokens most estimates miss.

Hidden reasoning tokens bill as output. 1.0x = thinking off. Medium-effort reasoning typically lands near 3x; heavy reasoning runs 6x to 8x. Set it to match your workload.

Estimated monthly cost
$1.0K
at current list prices
Fresh input$400
Cached input$0.00
Output incl. thinking$600
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Provider

Where this model runs, and what it charges.

PlatformInput / MOutput / MCache read / MBatchAccess
Anthropic
$2$10$0.2✓First-party API

Price history

Has this model gotten cheaper or more expensive?

No changePriced at $2 / $10 per 1M since October 1, 2026.

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Rates are generated from SuperPenguin's live pricing catalog.