Claude Opus 4.6

Claude Opus 4.6 is a multimodal language model developed by Anthropic, first observed on 2026-02-16. It is associated with twelve aliases—Claude, Claude 3 Opus, Claude 3.5 Opus 4.6, Claude Opus, Claude Opus 3, Claude Opus 4, Claude Opus 4.0, Claude Opus 4.1, Claude Opus 4.5, Claude Opus 4.7, Claude Opus 4.8, and Claude Opus 5—reflecting its position within an aggressively branched, non-sequential versioning scheme. On the BIRD text-to-SQL benchmark, Claude Opus 4.6 posted a score of 71.04. Anthropic has not publicly disclosed the evaluation configuration, dataset split, or testing date for this result, which limits reproducibility and cross-model comparison. Claude Opus 4.6 matters now because its extensive alias set, spanning version numbers from 3 to 5, introduces direct traceability risks for enterprise deployments: without a canonical name, usage logs, cost reports, and audit trails can fragment across multiple labels, complicating compliance verification and vendor management for organizations that require unambiguous model identification.

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