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Vendor: Anthropic Model ID: claude-opus-4-6 Capability: 200K context · tool use · vision · prompt caching · streaming · extended thinking Pricing: per-token, Opus tier (live rate) Opus 4.6 is the refinement step on 4.5 — tighter long-form prose and a measurable drop in hallucinations when summarising across many documents within its 200K context. It’s the right Opus for multi-document workflows that 4.5 was nearly good enough at: legal review, scientific literature synthesis, codebase audit reports. Opus 4.8 is the current flagship; 4.6 is kept available for teams who’ve validated against this specific version.

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Cache rate at the discounted tier visible in the pricing table.

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When to use

  • Multi-document synthesis where 4.5 was almost-but-not-quite reliable.
  • Long-form summarisation that needs tight, non-repetitive prose.
  • For the current flagship Opus, see Opus 4.8.
  • For mid-tier cost / latency, see Sonnet 4.6.

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