Claude✓ ReviewedTry itChecked 30 August 2026Claude Sonnet 5 may be the smarter default before you reach for Opus.
Anthropic's new Sonnet model targets professional coding, agentic work and reasoning at a lower price point than Opus. The launch rate has since become its standard price.
Bit’s takeaway
What changed
Anthropic released Claude Sonnet 5 with API pricing of US$2 per million input tokens and US$10 per million output tokens. Announced as introductory through 31 August 2026, that rate has since become the standard price and the scheduled increase to US$3 and US$15 was cancelled. It is positioned as the practical default for broad professional work.
Why it matters
A stronger flagship model is not automatically the better operating default. Sonnet may deliver enough quality with lower cost and latency for repeatable work, leaving Opus for tasks that fail a named quality test or genuinely need longer-horizon reasoning.
Who should care
- Teams choosing a default Claude API model
- People using Claude for routine coding, documents or agentic work
What to do
Start a representative workload on Sonnet 5, define the failure conditions that justify Opus, and track how often escalation actually changes the accepted result.
The human take
Tools change fast. Your judgment matters more.
A person defines the quality threshold and decides when a task has earned the extra cost and review burden of Opus.
Affected guidance
Put this to work
Verified facts
- Anthropic released Claude Sonnet 5 for professional coding, agentic work and reasoning, and its published API pricing is now the standard rate rather than an introductory one, with the previously scheduled increase cancelled.Checked
Sources and method