SYSTEM Cited by 1 source

Claude Sonnet 4

Claude Sonnet 4 is Anthropic's frontier-tier Sonnet-class model, positioned as the middle-capacity rung of the Claude family (between Haiku and Opus). Production-available on AWS Bedrock and Anthropic's direct API.

Pattern of appearance in the wiki

Sonnet-4 shows up on the wiki as the default frontier-tier choice for production LLM workloads that need better accuracy than small open-source models but don't need Opus-class capability, typically hosted on AWS Bedrock when compliance review is a pre-condition for sending regulated text (PII, business metrics) to a third-party LLM.

Seen in

• sources/2025-09-24-zalando-dead-ends-or-data-goldmines-ai-powered-postmortem-analysis — Zalando's current-generation postmortem analysis pipeline runs on Claude Sonnet 4 on AWS Bedrock. Per-document processing time ~30 s. Hallucination rate "negligible" at this tier after prompt hardening. Residual surface attribution error rate disclosed at "approximately 10%, even with advanced models such as Claude Sonnet 4" — canonical wiki datum that attribution error is a structural reasoning limitation rather than a scale problem.

Related

• systems/amazon-bedrock — the hosting platform.
• systems/zalando-postmortem-analysis-pipeline — canonical production consumer.
• concepts/llm-hallucination — the failure-mode category Sonnet-4 largely eliminates at this tier.
• concepts/surface-attribution-error — the failure mode Sonnet-4 does not fully eliminate (~10% residual).