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Anthropic · frontier · Mixed (not disclosed)

Claude Sonnet 4.6

License
Proprietary (Anthropic API)
Provider
Anthropic
Parameters
Mixed (not disclosed)

Chain assignments

Which inference chains this model serves in production. Source: policy.toml.

  • frontier-last-resort

Most-recent measurement

blended F1 = 0.952

Bench: Securie public-bench held-out (cross-class) · Measured: 2026-04-29

Provenance

Weights source: https://www.anthropic.com/claude

Notes

  • Frontier last-resort escalation only. <5% of total traffic by design.
  • The Enterprise tier hard-blocks via TenantOverrides::ENTERPRISE — operator-zero-knowledge invariant requires inference to stay on owned/OSS infrastructure.
  • Replaced GPT-5.4 Nano on 2026-04-28 (better measured F1).
Source of truth: app/_data/model-cards.ts · Updated via PR + reviewable in git history.