Claude Sonnet 5.5
Claude Sonnet 5.5: 30%+ faster than Sonnet 5, with 1M-token context.
Anthropic's fast, cost-efficient AI model for everyday coding, documents and design work.
Claude Sonnet 5.5 announcement
1 / 3Overview
What is Claude Sonnet 5.5?
Claude Sonnet 5.5: 30%+ faster than Sonnet 5, with 1M-token context.
Claude Sonnet 5.5 is Anthropic's fast, cost-efficient AI model for everyday work — coding, bug fixes, documents, slides, spreadsheets and design. The second model in the Claude 5.5 family, it runs 30%+ faster than Sonnet 5 and costs up to 30% less per task, with a 1M-token context window.
Benchmarks (official): Terminal-Bench 4.0 agentic coding at 70.6% (vs 10.3% for Sonnet 5, ahead of Opus 5.5's 66.4%); GDPval-AA knowledge work at 1844; OSWorld computer use 80.1%. It follows slide templates to produce decks needing minimal editing, has adjustable effort levels for cost/speed/quality tradeoffs, and is the first Sonnet with Opus-class cyber safeguards.
Access it through Claude web/desktop/mobile apps, the Claude API (model ID claude-sonnet-5-5), Claude Code, Claude in Chrome and Microsoft 365, AWS Bedrock, Google Cloud, Microsoft Azure, and GitHub Copilot (GA).
Pricing: API at $2 per 1M input tokens and $10 per 1M output tokens, with prompt cache reads at $0.20/1M and writes at $2.50/1M. Claude app plans: Free $0; Pro $17/mo billed annually or $20/mo monthly; Max from $100/mo; Enterprise $20/seat/mo plus API usage.
Platforms and languages
Claude Sonnet 5.5 Availability
Platforms
Languages
Capabilities
Claude Sonnet 5.5 Key Features
Fastest Sonnet to date
30%+ faster output generation than Sonnet 5, lowering task costs up to 30%.
1M-token context
1M-token context window for large codebases and long documents.
Strong coding and knowledge-work benchmarks
Terminal-Bench 4.0 at 70.6%, CursorBench 55.5%, GDPval-AA knowledge work at 1844 — near Opus 5.5 at Sonnet cost.
Design and slide generation
Follows slide templates to produce decks needing minimal editing, with a sharp eye for design.
Adjustable effort levels
Adjustable effort levels let you trade off cost, speed and quality per task.
Enterprise-grade safeguards
First Sonnet with Opus-class cyber safeguards, fallback protections and anti-distillation safety classifiers; zero data retention available on Claude Platform, AWS, Google Cloud and Azure.
Best for
Who uses Claude Sonnet 5.5?
Developers and enterprises
Coding, bug fixes and agentic development with a fast, cost-efficient model
Knowledge workers and teams
Documents, slides, spreadsheets and design tasks on Claude apps or the API
Plans and access
Claude Sonnet 5.5 Pricing
Freemium
API $2 in / $10 out per 1M tokens. App: Free $0, Pro $17-$20/mo, Max from $100, Enterprise $20/seat.
Common questions
Claude Sonnet 5.5 FAQs
What is Claude Sonnet 5.5?
It's Anthropic's fast, cost-efficient AI model for everyday work — coding, bug fixes, documents, slides and design. It runs 30%+ faster than Sonnet 5, costs up to 30% less per task, and has a 1M-token context window.
How much does the Claude Sonnet 5.5 API cost?
Official pricing is $2 per 1M input tokens and $10 per 1M output tokens, with prompt caching at $0.20/1M for reads and $2.50/1M for writes. Claude app plans run from Free ($0) to Pro ($17-$20/mo), Max (from $100/mo) and Enterprise ($20/seat/mo + API usage).
How can I access Claude Sonnet 5.5?
Through the Claude web, desktop and mobile apps, the Claude API (model ID claude-sonnet-5-5), Claude Code, Claude in Chrome and Microsoft 365, AWS Bedrock, Google Cloud, Microsoft Azure, and GitHub Copilot.
How does Sonnet 5.5 compare to Sonnet 5?
Per Anthropic's benchmarks, it's 30%+ faster at generating output and much stronger on agentic coding (Terminal-Bench 4.0: 70.6% vs 10.3%) and knowledge work, at up to 30% lower task cost.
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