Claude Sonnet 4.6 is Here
Anthropic's most capable Sonnet yet — approaching Opus-level intelligence at Sonnet pricing. Try it free in Code Reviewer and Kilo Cloud to celebrate the launch.
Why Sonnet 4.6
Opus-level intelligence at a fraction of the cost
Opus-Level Intelligence
Users preferred Sonnet 4.6 over Opus 4.5 59% of the time. Get frontier-class performance without the frontier price tag.
79.6% SWE-bench Verified
Near the top of the field for agentic coding, rivaling models costing significantly more.
1M Token Context
Reason effectively across entire codebases, contracts, and research papers with a 1 million token context window.
Less Lazy, More Reliable
Significantly less prone to overengineering and laziness. Better instruction following, fewer hallucinations, fewer false claims of success.
Agentic Powerhouse
59.1% on Terminal-Bench 2.0, 72.5% on OSWorld for computer use, 91.7% on τ-bench Retail for tool use.
Beautiful Frontend Code
Notably more polished visual outputs with better layouts, animations, and design sensibility. Fewer rounds of iteration needed.
Free to Try — Celebrate the Launch
Experience Sonnet 4.6 at no cost in Code Reviewer and Kilo Cloud
Free in Code Reviewer
Get AI-powered code reviews using Sonnet 4.6 — completely free during the launch celebration. Review your PRs with Opus-level intelligence.
Start Reviewing →Free in Kilo Cloud
Run Sonnet 4.6 agents in the cloud with zero cost during launch week. Build, debug, and ship code with the most capable Sonnet ever.
Open Kilo Cloud →Sonnet 4.6 Benchmark Performance
Approaching Opus-level scores at Sonnet pricing
Read the full announcement →| Benchmark | Sonnet 4.6 | Opus 4.6 | Sonnet 4.5 |
|---|---|---|---|
| SWE-bench Verified | 79.6% | 80.8% | 77.2% |
| Terminal-Bench 2.0 | 59.1% | 65.4% | 51.0% |
| OSWorld-Verified | 72.5% | 72.7% | 61.4% |
| τ-bench Retail | 91.7% | 91.9% | 86.2% |
| BrowseComp | 74.7% | 84.0% | 43.9% |
| ARC-AGI-2 | 58.3% | 68.8% | 13.6% |
| GPQA Diamond | 89.9% | 91.3% | 83.4% |
| Finance Agent v1.1 | 63.3% | 60.1% | 54.5% |
How to use Claude Sonnet 4.6
Get started in minutes
Install Kilo Code
Install the Kilo Code extension in VS Code, JetBrains, or use the CLI.
Select Claude Sonnet 4.6
Choose claude-sonnet-4-6 from the model picker in any mode.
Or Try Code Reviewer
Visit kilo.ai/code-reviewer and get free Sonnet 4.6 code reviews on your PRs.
Or Try Kilo Cloud
Visit kilo.ai/cloud and run Sonnet 4.6 agents in the cloud for free during launch.
Start Building
Use Code, Architect, Debug, or Orchestrator mode with Opus-level intelligence.
Trusted by developers at the world's most innovative companies
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Ask mode
A knowledgeable technical assistant focused on answering questions without changing your codebase
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Start Using Claude Sonnet 4.6 Today
Opus-level intelligence. Sonnet pricing. Free in Code Reviewer and Kilo Cloud.