Claude Sonnet 4
AnthropicLarge Language ModelProprietaryAnthropic's balanced model offering strong performance at lower cost than Opus. Ideal for most production workloads.
Abilities
Use Cases
Available in Tools
Availability
How to Use
Pros
- Best quality-to-cost ratio in the Claude family — strong performance at 1/3 the price of Opus 4.8
- Fast enough for real-time chat while still being highly capable
- 1M token context window with excellent long-document comprehension
- Strong coding performance — powers Claude Code for autonomous development
- Default model in most third-party integrations (Cursor, Copilot, Windsurf)
- Excellent instruction following — reliably produces structured outputs and follows constraints
Cons
- Closed source — no self-hosting or model customization possible
- Noticeable quality gap vs Opus on very complex reasoning and nuanced writing
- May oversimplify in specialized domains (law, medicine, advanced math)
- Same safety constraints as Opus — can occasionally refuse valid requests
What to Use It For
Perfect For
Best quality-to-cost ratio — 80-90% of Opus quality at 1/5 the price, powering most IDE integrations
Fast enough for real-time chat with strong instruction following and safety alignment
Optimal balance of speed, quality, and cost for iterative coding workflows
Good For
Produces well-structured, clear content for blogs, emails, and marketing copy
Reliable structured output and good comprehension make it efficient for ETL-like tasks
Not Recommended
Drops nuance on highly complex legal, medical, or academic analysis tasks
Try instead: Claude Opus 4
Closed source cloud-only model — no weights available for self-hosting
Try instead: Llama 3.3 70B
Do Not Use For
Cloud-only closed model — cannot run without internet connection to Anthropic servers
Try instead: Phi-4, Gemma 3
Text-only LLM with no image generation capabilities
Try instead: DALL-E 3