Claude 4.5 Sonnet
A frontier-level hybrid-reasoning model excelling at coding, long-horizon tasks, computer use, and domain reasoning with top-tier alignment and reliability.
Claude 4.5 Sonnet at a glance
Context window
1M tokens
Input price
$3
per 1M tokens
Output price
$15
per 1M tokens
Why use Claude 4.5 Sonnet
Strengths, benchmarks, and where Claude 4.5 Sonnet fits in your team's workflow.
1. Best-in-class coding performance
- #1 on SWE-bench Verified (77.2% standard, 82.0% high-compute).
- Excels at debugging, architecture, and multi-file code generation.
- Maintains coherence for extremely long tasks (30+ hours).
2. State-of-the-art computer use & agents
- Leads OSWorld at 61.4%.
- Strongest model for agentic workflows, multi-step tool use, and real computer control.
- Powering Claude Code, the new Claude Agent SDK, and Chrome agent actions.
3. Advanced reasoning & math
- Large improvements across reasoning-heavy benchmarks (AIME, MMMLU, τ2-bench, Terminal-Bench).
- Deep multi-step reasoning with extended or interleaved thinking.
4. High alignment & safety
- Most aligned Claude model to date with reduced deception, hallucinations, sycophancy, and harmful compliance.
- Strong protections against prompt injection for agentic tasks (ASL-3 safeguards).
5. Domain-expert performance
- Notable gains in finance, law, medicine, and STEM tasks.
- Trusted by early customers for long-context legal analysis, multi-file engineering, security research, and red-teaming.
Power your team with Claude 4.5 Sonnet
Appaca is the AI workspace for operators. Build internal tools and AI co-workers powered by Claude 4.5 Sonnet - connected to your real data and ready for your whole team. No code, no deployment.
Build internal AI tools
Describe what you need and the Appaca agent builds it - lead scorers, report generators, email drafters - with Claude 4.5 Sonnet as the engine. No code, no deployment.
Give Claude 4.5 Sonnet your real data
Connect the tools your team already uses - Slack, Notion, Google Sheets, Airtable, and more - so Claude 4.5 Sonnet works with real context, not generic answers.
Automate recurring tasks
Schedule Claude 4.5 Sonnet to run on autopilot - daily digests, weekly summaries, or real-time triggers - all managed inside your Appaca workspace.
Describe it, and it's built
Tell the Appaca agent what your team needs and it builds a working app powered by Claude 4.5 Sonnet - connected to the tools you already use.
Where teams use Claude 4.5 Sonnet
See how teams put Claude 4.5 Sonnet to work inside Appaca - internal tools and AI agents that work around you.
Sales
Score leads, draft follow-ups, and summarise deals with Claude 4.5 Sonnet doing the heavy lifting.
Explore Appaca for SalesMarketing
Draft, repurpose, and report on campaigns in your brand voice - powered by Claude 4.5 Sonnet.
Explore Appaca for MarketingOperations
Automate reporting, vendor tracking, and process docs with AI built around your workflow.
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Build internal AI tools with Claude 4.5 Sonnet
Describe the tool your team needs and get a working app powered by Claude 4.5 Sonnet - with a built-in database, team access, and integrations. No code, no deployment.