Claude Sonnet 4
The workhorse Claude — strong, fast and cost-conscious.
via Anthropic →
What is this model?
Claude Sonnet 4 is the fourth generation of Anthropic's Sonnet line — optimised for the balance between quality and cost. With a 200K-token context window, strong instruction-following and a pronounced focus on safety alignment, this is the workhorse of the Claude family. ZelixAI offers it via a direct API connection with Anthropic — encrypted over TLS 1.3, no third-party processing layer in between.
Strengths
Strengths: top scores on reasoning benchmarks (MMLU, GPQA), excellent tool-use with reliable argument types, broad language coverage, and the most consistent behaviour across different prompt styles. The 200K context enables RAG flows with large knowledge bases. For most users who pick "quality over speed", Sonnet 4 is the recommended Cloud choice.
Best suited for
- Complex reasoning and multi-step tasks
- Tool-use / function-calling workflows
- Text creation, marketing copy, letters
How ZelixAI uses this model
We position Sonnet 4 as the default Cloud Premium pick: for business conversations that demand accuracy — lead qualification, complex support tickets, content creation, B2B conversations. For customers without strict EU-data-residency requirements, this is often the best price/quality balance in our catalog.
Real-world examples within ZelixAI
Concrete praktijkvoorbeelden voor dit model worden binnenkort hier gepubliceerd. Stel intussen vragen via onze contactpagina — we delen graag relevante use-cases uit onze klantbasis.
Limitations and caveats
Limitations: US cloud provider — not suitable if your compliance requirements demand full EU data residency. Higher cost per token than Privacy Cluster models (which translates into a higher multiplier in our packages). Anthropic has a knowledge cut-off in early 2024; for up-to-date information always combine with our RAG layer.
Technical specifications
| Provider | Anthropic |
| Context window | 200K tokens |
| Throughput | 40–100 tokens/s (Fast) |
| Cost tier | Mid-range |
| Tool / function-calling | yes |
| Data residency | United States (cloud provider) |