Anthropic extended access for Claude Fable 5 for subscribers for the second time in a week, an apparent response to the launch of OpenAI’s latest ChatGPT model. Anthropic, announcing its decision Sunday on X, through an email to subscribers and an updated support page, said Claude Fable 5 would be available to subscribers at no extra cost through July 19. That marks the second time Anthropic has expanded access to Fable after launching a one-week promotion on July 7, allowing Claude users to spend up to 50% of their weekly subscription limits on the model. The extension comes just three days after OpenAI launched GPT-5.6, headlined by its flagship model Sol, which the company said achieved “state-of-the-art” results. OpenAI claimed Sol outperformed Anthropic’s Fable in coding tasks. Anthropic has said it plans to open up Mythos—its restricted flagship AI model, from which Fable is made with additional safety guardrails—“more broadly in the future,” though access is currently limited to roughly 150 organizations across more than 15 countries.