What does Claude Sonnet 5.5 cost?

Claude Sonnet 5.5 is priced at $10 output and $2 input (USD per 1M tokens)

How large is the context window of Claude Sonnet 5.5?

Claude Sonnet 5.5 has a 1M Tokens context window with up to 128K Tokens output.

Where can I access Claude Sonnet 5.5?

Official channels: Website and API platform.

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Anthropic

Claude Sonnet 5.5

AClosed

The second model in the Claude 5.5 family, released by Anthropic on September 28, 2026. A clear upgrade over Sonnet 5, it runs more than 30% faster and cuts costs by up to 30% on most tasks. Positioned as a faster, lower-cost complement to Opus 5.5, it excels at well-scoped everyday tasks, bug fixes, and document/slide/spreadsheet creation.

API Pricing

Input

Output

$10

Cached input

$0.2

Peak hours

—

USD / 1M tokens

※ Official release announcement (anthropic.com/claude-sonnet-5-5, 2026-09-28): input $2 / cache read $0.2 / output $10 per million tokens, the same price as Sonnet 5; because fewer tokens are needed per task, measured per-task cost is up to 30% lower

Price sourceanthropic.com ↗openrouter.ai ↗

No price change in the last two snapshots

Price history

12 snapshots · 2026-04-28 → 2026-08-17

Current: $25Period low: $25 (2026-04-28)Period high: $25 (2026-04-28)First tracked: $25 (2026-04-28)

Specifications

Context window: 1M Tokens
Max output: 128K Tokens
Input modalities: Text · Image
License: Closed

Overall score

Total

69.6

Rank

Tier

Data confidence

85%

Capability97

Scale35

Value52

Context60.5

Ecosystem36

Freshness92.8

Capabilities & use cases

Terminal-Bench_4.0 70.6%GDPval-AA_v2.1 1844

Key capabilities

Cyber safeguards (first Sonnet with Opus-level safeguards)
Long-horizon work
Image understanding
Fast iteration

Best for

Everyday coding and bug fixes
Document/slide/spreadsheet creation
High-concurrency agents
Long-horizon tasks

Official links

Website ↗API platform ↗Pricing page ↗Open in comparator ↗

Same vendor

Claude Haiku 5.5 Claude Opus 5.5 Claude Fable 5.1 Claude Opus 4.8

FAQ

What does Claude Sonnet 5.5 cost?: Claude Sonnet 5.5 is priced at $10 output and $2 input (USD per 1M tokens)
How large is the context window of Claude Sonnet 5.5?: Claude Sonnet 5.5 has a 1M Tokens context window with up to 128K Tokens output.
Where can I access Claude Sonnet 5.5?: Official channels: Website and API platform.

Data is refreshed daily and cross-checked against two independent sources; please confirm pricing and specs on the vendor page.