A new Sonnet baseline
Anthropic introduced Claude Sonnet 4.6 on February 17, 2026. The release described improvements across coding, computer use, planning, and professional tasks, together with a one-million-token context window in beta.
For teams that had reserved difficult work for a larger model, the announcement created a reason to rerun established evaluations.
Revisit decisions with evidence
A model-routing rule can become outdated as smaller tiers improve. However, switching based on a provider's comparison alone can overlook the application's unusual inputs or formatting constraints. The existing regression set is a useful starting point because it reflects failures the team has already encountered.
Review ordinary successful tasks as well, so a gain on difficult examples does not hide a regression in everyday work.
Compare the review burden
Measure the number of interventions needed to produce an accepted deliverable. Include incomplete work, unintended changes, and errors that appear only after a file is rendered or executed. Combine those observations with latency and usage. The result can justify moving a class of tasks to a different tier while keeping a clear escalation path for the cases that still require more capability.
Official sources
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