GoKawiilAnthropic is upgrading Claude Sonnet, replacing Sonnet 4.6 from February with Sonnet 5 as the best medium-sized model.
Claude Sonnet 5 has arrived as ‘most agentic Sonnet model yet’
In Anthropic’s universe, Sonnet is Claude’s medium-sized AI model that sits between the smaller Haiku model and the larger Opus model.
“Claude Sonnet 5 is built to be the most agentic Sonnet model yet. It can make plans, use tools like browsers and terminals, and run autonomously at a level that, just a few months ago, required larger and more expensive models,” the company says.
“Sonnet 5 narrows the gap: its performance is close to that of Opus 4.8, but at lower prices. It’s a substantial improvement over its predecessor, Sonnet 4.6, on important aspects of agentic performance like reasoning, tool use, coding, and knowledge work.”
Sonnet 5 is the new default model for Claude free and pro users
Anthropic says that today’s Sonnet 5 release is the default for both Free and Pro Claude users. The company also has special introductory pricing that runs through August 31.
“Claude Sonnet 5 is available everywhere today at an introductory price of $2 per million input tokens and $10 per million output tokens through August 31, 2026,” the company says.
“It then moves to standard pricing at $3 per million input tokens and $15 per million output tokens. We’ve increased rate limits across Chat, Cowork, Claude Code, and the Claude Platform to accommodate the higher token usage of higher effort levels; users can select whichever level makes sense for their particular project,” Anthropic adds.
Anthropic also has its most capable Mythos 5 and Fable 5 models. Mythos 5 has fewer guardrails for select security researchers and platform owners.
... continue reading