Anthropic Launches Claude Sonnet 5 AI Model with Coding, Safety Upgrades
Anthropic PBC today debuted Claude Sonnet 5, a midrange large language model that outperforms its predecessor in several areas. The LLM will be the default option in the consumer tiers of the company’s Claude chatbot service.
2026-07-01
Anthropic introduces Claude Sonnet 5, a new AI model with enhanced coding capabilities.
The model shows significant improvements over its predecessor in various benchmarks.
New cybersecurity features reduce risks associated with LLM autonomy.
Export controls on Mythos 5 and Fable 5 have been lifted, restoring access.
Sonnet 5 will be available in multiple pricing tiers starting September.
Introduction of Claude Sonnet 5
Performance Improvements Over Predecessors
Anthropic measured Sonnet 5’s coding capabilities using two benchmarks called SWE-Bench Pro and Terminal-Bench 2.1. The model improved upon the scores of its predecessor by 5.1% and 13.4%, respectively.
Enhanced Autonomy and Cybersecurity Features
One of the contributors to Sonnet 5’s increased output quality is that it’s more autonomous. It is better at blocking malicious requests and prompt injection attacks .
Pricing and Availability
Sonnet 5 will be available in multiple pricing tiers starting September, priced at $3 per million input tokens and $15 per million output tokens.
Restoration of Access to Mythos and Fable Models
The U.S. government lifted export controls on Mythos 5 and Fable 5, allowing Anthropic to restore access. Fable 5 will be broadly available, while Mythos 5 will be limited.