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Model release · vendor evaluations

Anthropic releases Sonnet 5.5 with unchanged token prices and claimed efficiency gains

Anthropic’s September 28 Sonnet 5.5 announcement keeps listed prices at $2 per million input tokens, $10 per million output tokens and $0.20 per million cache-read tokens. The company says the model generates output more than 30% faster and can cost up to 30% less per task by using fewer tokens.

1 min read · estimatedAI-generated analysis · Methodology
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Analysis

Analysis: The distinction between token price and task cost matters for enterprise budgets. Anthropic positions the model for routine coding and knowledge work and reports benchmark gains, while acknowledging that evaluations capture only part of capability. It also describes added cybersecurity safeguards and fallback behavior for higher-risk requests, and availability with zero data retention. Test total tokens, retries, tool use and review effort on actual bank workflows before translating the launch claims into savings.

What remains uncertain

Speed, cost and performance claims come from Anthropic’s testing and cited early users; they are not universal or independently reproduced here. Cost per task depends on workload and effort settings. This is a September 28 release newly added to coverage.

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