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Assistant evaluation efficiency

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Slack reports better offline results with fewer tokens

IN CONTEXTAssistant evaluation efficiency1 viewpoints
2026-09-28

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Slack reports better offline results with fewer tokens

In a customer testimonial published by Anthropic, Slack’s Curtis Allen reports that Sonnet 5.5 outperformed Sonnet 5 on almost all of their offline Slackbot evaluations without prompt changes, using fewer steps and about 14% fewer output tokens.

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Supporting evidence

Customer testimonials published by Anthropic for Claude Sonnet 5.5

Original excerpt

“Without changing any of our prompts, Claude Sonnet 5.5 did better than Sonnet 5 on almost all of our offline Slackbot evals, in fewer steps and with about 14% fewer output tokens. When someone gives Slackbot a task, quality and speed are what matter most, and Sonnet 5.5 allows Slackbot to deliver better outcomes for users, faster.”

Publication dates describe the sources, not changes in belief.