Anthropic launches Claude Sonnet 5 with improved AI capabilities

Investing.com -- Anthropic released Claude Sonnet 5 on Tuesday, marking what the company describes as its most capable Sonnet-class AI model to date. The new model can perform autonomous tasks including planning, tool use, and coding at performance levels previously requiring more expensive models.

The company said Claude Sonnet 5 delivers performance close to its Opus 4.8 model while maintaining lower costs. The model shows improvements over its predecessor, Sonnet 4.6, in areas including reasoning, tool use, coding, and knowledge work.

Anthropic's safety evaluations indicated that Sonnet 5 demonstrates a lower overall rate of undesirable behaviors compared to Sonnet 4.6. The model also shows reduced cybersecurity capabilities relative to current Opus models.

Claude Sonnet 5 became available Tuesday across all subscription tiers as the default model for Free and Pro plans. Team and Enterprise users can also access the model through Claude Code and the Claude Platform.

The company set introductory pricing at $2 per million input tokens and $10 per million output tokens through August 31, 2026. After that date, pricing will increase to $3 per million input tokens and $15 per million output tokens.

On agentic search and computer use evaluations, Sonnet 5 performed better than Sonnet 4.6 across different effort levels. Opus 4.8 maintains higher accuracy for these tasks at a higher price point.

Safety testing showed Sonnet 5 improved at refusing malicious requests and resisting prompt injection attacks compared to Sonnet 4.6. The model displayed lower rates of hallucination and sycophancy than its predecessor.

Anthropic's cybersecurity evaluations revealed that Sonnet 5 could not develop working exploits for software vulnerabilities, though it showed slightly higher partial success rates than Sonnet 4.6. The company launched the model with cyber safeguards enabled by default.

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