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Get started freeClaude 4.5 Sonnet vs Claude 3 Sonnet
Compare Claude 4.5 Sonnet and Claude 3 Sonnet. Build AI products powered by either model on Appaca.
Model Comparison
| Feature | Claude 4.5 Sonnet | Claude 3 Sonnet |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Model Type | text | text |
| Context Window | 1,000,000 tokens | 200,000 tokens |
| Input Cost | $3.00/ 1M tokens | $3.00/ 1M tokens |
| Output Cost | $15.00/ 1M tokens | $15.00/ 1M tokens |
Stop choosing. Use both.
With Appaca you don't have to pick — build apps that are powered by Claude 4.5 Sonnet, Claude 3 Sonnet, for your specific use case.
Build your first app freeStrengths & Best Use Cases
Claude 4.5 Sonnet
Anthropic1. 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.
Claude 3 Sonnet
Anthropic1. Speed + Intelligence Blend
- 2x faster than Claude 2/2.1
- Strong reasoning with lower cost
2. Enterprise-Ready
- Designed for high-volume, large-scale deployments
- Excellent stability for production workloads
3. Versatile Task Performance
- Great for RAG, search, document understanding
- High-quality code generation
- Effective at sales automation and knowledge retrieval
4. Vision Capabilities
- Reads charts, graphs, images reliably
- Extracts text from visuals efficiently
Prompts to Get Started
Use these prompts to power AI products you build on Appaca. Each works great with the models above.
Best for Claude 4.5 Sonnet
textTransfer Pricing Explainer
Explain transfer pricing concepts and compliance requirements in plain language.
Technical Specification
Write a detailed technical specification for a feature before implementation.
Definition of Done
Write a team's Definition of Done for sprint work and releases.
Best for Claude 3 Sonnet
textUser Content Policy
Write a user-generated content policy for a platform or community.
Workplace Investigation Procedure
Write a procedure for investigating a workplace complaint or misconduct allegation.
Terms of Sale
Draft terms of sale for an e-commerce or product business.