Anthropic introduced Claude Sonnet 5.5 on September 28 as a faster, lower-cost complement to Opus 5.5. The announcement positions it for well-scoped everyday work, bug fixes, and polished business documents. These are supplier descriptions that should guide evaluation, not substitute for it.
Look for repeatable knowledge work
Consider tasks where staff already know what an acceptable result looks like: updating a document from supplied changes, preparing a structured internal summary, or fixing a bounded software defect.
Provide source material and explicit acceptance criteria. A model asked to create a financial summary without verified figures may produce polished output that is still unsuitable for use.
Compare total effort
Anthropic reports improved speed and fewer tokens for many tasks. Measure whether that reduces your actual review and completion time. A faster first draft is only useful if it remains accurate and follows the requested format.
For coding, keep the test environment, repository, and allowed tools consistent across candidates. Model performance depends on the surrounding agent setup as well as the model itself.
Keep a higher-complexity route
Define which tasks require more sustained judgment or specialist review. Escalation should follow observable conditions such as conflicting evidence or repeated failed validation, not only a vague request to try harder.
The middle tier can become an economical default for an evaluated class of work. Avoid making it the default for every process merely because its price and benchmark position appear balanced.
Sources & further reading
Reviewed October 26, 2026. Product availability and regulatory guidance can change. Vendor performance claims are not independent Rovio AI benchmarks.
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