{"slug": "anthropics-new-fable-release-is-cheaper-less-restrictive", "title": "Anthropic’s new Fable release is cheaper, less restrictive", "summary": "Anthropic released Fable 5.1 and Mythos 5.1 on Tuesday, with the unrestricted Fable version now available on cloud platforms and via the Anthropic API, while Mythos remains limited to registered partners in cybersecurity and life sciences. The new models reduce token costs and false-positive restrictions, and Anthropic will roll out its Enterprise Frontier Safeguards service in June, allowing clients to run models on their own infrastructure with Zero Data Retention. The system card rates Mythos 5.1 as 'low-risk' for automated AI development concerns, though it notes a slight regression in misaligned behavior compared to Opus 5.", "body_md": "On Tuesday, Anthropic released Fable and Mythos 5.1, twinned versions of the company’s most advanced AI model. In addition to performance upgrades, the new Fable release includes changes meant to reduce token cost and false-positive restrictions from the model’s safeguards.\n\nAs with the previous Mythos model, Mythos 5.1 will only be available to registered Anthropic partners engaged in either cybersecurity or life sciences research. Fable 5.1, the unrestricted version, is available starting today on cloud platforms or through the Anthropic API.\n\nOne of the most significant changes is Anthropic’s [previously reported](https://www.axios.com/2026/08/19/openai-previews-zero-retention-safety-system-as-anthropic-requires-data-logs) embrace of Zero Data Retention, allowing clients to run Anthropic models on their own infrastructure without data outflows. Previously unavailable for Fable due to security concerns, a high-privacy service (called [Enterprise Frontier Safeguards](https://www.anthropic.com/news/enterprise-frontier-safeguards)) will now roll out to users in June. Notably, the system will still monitor for misuse by agents or human users, but clients will control how the monitoring takes place.\n\nAs part of [the announcement](https://www.anthropic.com/news/enterprise-frontier-safeguards), Anthropic assured customers that their data had not been inappropriately accessed. “Anthropic has never trained on enterprise data without explicit permission, and never will,” the announcement reads.\n\nAs is common for an Anthropic release, the new models set records in a range of benchmarks, including Terminal-Bench 4.0 (for CLI-based coding) and Humanity’s Last Exam (for general reasoning). Anthropic also released three novel scientific findings generated by the models before their release, including a custom GPU optimization and a high-resolution map of Venus assembled from existing photos.\n\nAs with previous releases, the models come with [a detailed system card](https://www-cdn.anthropic.com/0339e6a7c5c7b87f5c07798616dc32c215d14235/Claude%20Fable%205.1%20&%20Claude%20Mythos%205.1%20System%20Card.pdf), which explains their capabilities in most straightforward terms. The system card rates Mythos as “low-risk” for concerns related to automated AI development — where the AI improves itself — which some see as a trigger for a loss of human control. It says, “its ability to accelerate internal AI R&D progress is in line with current trends.”\n\nIn terms of general misbehavior, Mythos is slightly more prone to it than Opus, possibly as a result of its enhanced capabilities.\n\n“Mythos 5.1 is a slight regression on overall misaligned behavior compared to Opus 5, and an improvement over Mythos 5 and Claude Sonnet 5,” the system card reads. “It cooperates with human misuse and accepts unverifiable claims of authorization somewhat more readily than Opus 5, but it is less likely to ignore explicit constraints, hallucinate inputs, or falsely claim to have completed tasks than previous models.”", "url": "https://wpnews.pro/news/anthropics-new-fable-release-is-cheaper-less-restrictive", "canonical_source": "https://techcrunch.com/2026/09/01/anthropics-new-fable-release-is-cheaper-less-restrictive/", "published_at": "2026-09-01 19:39:22+00:00", "updated_at": "2026-09-01 19:54:40.691432+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-products", "ai-safety", "ai-policy"], "entities": ["Anthropic", "Fable 5.1", "Mythos 5.1", "Opus 5", "Claude Sonnet 5", "Enterprise Frontier Safeguards"], "alternates": {"html": "https://wpnews.pro/news/anthropics-new-fable-release-is-cheaper-less-restrictive", "markdown": "https://wpnews.pro/news/anthropics-new-fable-release-is-cheaper-less-restrictive.md", "text": "https://wpnews.pro/news/anthropics-new-fable-release-is-cheaper-less-restrictive.txt", "jsonld": "https://wpnews.pro/news/anthropics-new-fable-release-is-cheaper-less-restrictive.jsonld"}}