Anthropic has given paying Claude users its most powerful artificial intelligence (AI) model yet, and for the next 13 days, it costs nothing extra to use.
The company launched Claude Fable 5 on 9 June 2026, the first public version of its Mythos-class technology, a tier it had kept out of public hands over cybersecurity fears. The model is free on Pro, Max, Team, and seat-based Enterprise plans through 22 June. From 23 June, using it needs usage credits priced at $10 (£7.47) per million input tokens and $50 (£37.35) per million output tokens, double the cost of the firm's Opus 4.8 model.
