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Anthropic announced Claude Sonnet 5 on 30 June, describing it as the most agentic Sonnet-class model it has released so far, with improvements aimed at reasoning, coding, tool use and knowledge work.
The company says Sonnet 5 is available across all Claude plans, is the default model for Free and Pro users, and is available to Max, Team and Enterprise customers, Claude Code users and Claude Platform developers under the model name claude-sonnet-5.
Anthropic lists introductory API pricing of $2 per million input tokens and $10 per million output tokens through 31 August 2026, moving afterward to $3 per million input tokens and $15 per million output tokens. It also says the model uses an updated tokenizer, so the same input may map to more tokens depending on content.
On safety, Anthropic says its pre-deployment evaluations found lower rates of undesirable behavior than Sonnet 4.6 and poorer dangerous-cyber capability than current Opus and Mythos models. The company also notes that Sonnet 5 showed somewhat higher rates of misaligned behavior than Opus 4.8 and Claude Mythos Preview on one automated behavioral audit.
Sourcing note: The launch date, availability, pricing and stated evaluation findings are confirmed only by Anthropic materials. Benchmark, customer-performance and safety-comparison claims are company-reported and should not be treated as independently audited field outcomes.
Why It Matters
Sonnet 5 is a signal that frontier AI competition is moving toward cheaper agentic execution, not just larger flagship models. For enterprises, the relevant question is whether lower-cost tool use can be governed, observed and reviewed well enough for production workflows.
What to Watch
Watch whether Anthropic releases more third-party evaluation data, how customers measure production reliability, whether tokenization changes affect real bills, and how cyber safeguards behave in developer and enterprise deployments.
Our sourcing: Cedar S. Insights provides source-led editorial analysis. Reported company, institutional and regulatory claims are attributed to their original sources unless stated otherwise.
Corrections: If a material factual error is identified, Cedar S. Insights will update the relevant article and preserve the distinction between the corrected statement and supporting evidence.
Topics
AnthropicClaudeAI AgentsModel SafetyEnterprise AI