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Anthropic Launches Claude Sonnet 5 With Near-Opus Performance at a Lower Price
Anthropic says the new medium-sized model can plan, use tools and run autonomously, while matching near-Opus performance at lower cost.
- On Tuesday, June 30, 2026, Anthropic released Claude Sonnet 5, a mid-tier AI model designed to deliver near-flagship performance at significantly lower cost than its Opus 4.8 counterpart.
- Designed to be its "most agentic Sonnet model yet," Sonnet 5 can make plans, use tools like browsers and terminals, and run autonomously at capabilities that previously required larger, costlier systems.
- Performance benchmarks show Sonnet 5 approaches Claude Opus 4.8, scoring 63.2% on agentic coding tests versus 69.2% for Opus 4.8 and 58.1% for the predecessor Sonnet 4.6.
- Anthropic reports Sonnet 5 demonstrates lower rates of hallucinations and "undesirable behaviors" than Sonnet 4.6, though the company noted cybersecurity capabilities remain intentionally below Opus-class systems.
- Introductory pricing of $2 per million input tokens and $10 per million output tokens holds through August 31, 2026, after which standard rates increase to $3 and $15 per million tokens.
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Coverage Details
Total News Sources19
Leaning Left4Leaning Right2Center3Last UpdatedBias Distribution45% Left
Bias Distribution
- 45% of the sources lean Left
45% Left
L 45%
C 33%
R 22%
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