Claude Fable 5.1 Brings Massive Performance Gains at Lower Cost

Anthropic has introduced Claude Fable 5.1 and Claude Mythos 5.1, two versions of the same underlying model with different safeguards and access levels.

Key points

• Claude Fable 5.1 is available now through Anthropic, Amazon Web Services, Google Cloud and Microsoft Azure.
• Mythos 5.1 additionally optimized seven open-source biology models, improving inference speeds by 1.4x to 2.5x on Nvidia H100 GPUs while keeping outputs identical.
• Mythos 5.1 will be available through Anthropic's Cyber Verification Program and Life Sciences Verification Program.
• While highly agentic workloads could save up to 45%, the firm estimates that typical Fable 5.1 workloads will cost around 25% less than Fable 5.
• Fable 5.1 defaults to High effort in Claude Code and Medium effort in Claude Cowork and Claude.ai.

While Mythos 5.1 is limited to trusted-access programs for vetted cybersecurity and life-sciences users, fable 5.1 is generally available.

For context, the new release focuses on stronger coding, scientific research, long-running tasks, lower costs, better privacy, and more precise safeguards. Fable 5.1 vs Mythos 5.1. Feature Claude Fable 5.1 Claude Mythos 5.1. Core model Same model Same model. Availability Generally available Trusted access only.

Cybersecurity Vulnerability discovery allowed, exploit development restricted Reduced safeguards for vetted cyberdefenders. Life sciences Advanced research remains restricted Expanded capabilities for verified researchers. Main users General, developer and enterprise customers Cybersecurity and life-sciences professionals. AI Coding Agents Can Be Tricked Into Installing Malware.

Anthropic has cut the cost of cache reads by 75% to $0.25 per million tokens.

Input and output pricing remains unchanged at $10 per million input tokens and $50 per million output tokens.

Anthropic notes Fable 5.1 improves substantially throughout coding, research, knowledge work, computer employ, and business automation.

Anthropic notes the model is additionally better at solving root causes instead of taking shortcuts. In testing by Millennium, Fable 5.1 identified the cause of a rare software crash that engineers and other models had failed to explain for four to five years. Anthropic tested both models throughout scientific research tasks.

Mythos 5.1 designed high-affinity protein binders using open-source protein design and folding tools. Throughout three targets, its binding affinities were 10 times higher than the best designs submitted to Adaptyv Bio competitions.

Its hit rate reached almost 50% throughout 12 targets, compared with typical protein-design rates of 10% to 15%.

Mythos 5.1 additionally optimized seven open-source biology models, improving inference speeds by 1.4x to 2.5x on Nvidia H100 GPUs while keeping outputs identical. Anthropic estimates the changes could reduce GPU costs for genome-wide analyses by 30% to 60%.

Fable 5.1 separately trained a neural network to produce a higher-resolution elevation map covering around one-third of Venus. The map improves detail from roughly 10-20 kilometers to 2-3 kilometers and produces height estimates up to 25% more accurately. Better Privacy and Safeguards.

Fable 5.1 will backing Anthropic's new Enterprise Frontier Safeguards. It provide privacy equivalent to zero data retention while keeping customer data inside infrastructure controlled by the customer.

Meanwhile, the system will roll out in phases beginning this fall. Until then, eligible customers can employ Fable 5.1 with zero data retention.

Anthropic has additionally produced cybersecurity safeguards more precise. While Fable 5.1 can now identify software vulnerabilities for defensive purposes, claude Code users should see around 60% fewer safeguard interventions per session. Penetration testing, exploit generation, and binary-based vulnerability scanning remain restricted.

Biology safeguards now trigger 85% less often on benign elementary biology and medical questions than the protections that originally introduced with Fable 5. Pentagon Now Has Custom Military Versions of ChatGPT and Grok. Mythos 5.1 Gets Trusted Access.

Meanwhile, the life-sciences program was developed with the US administration and has already enrolled its first participants.

While still remaining in the lower risk category under its framework, anthropic notes Mythos 5.1 has the strongest cybersecurity capabilities of any model it has issued when tested without safeguards. Claude Security is additionally now powered by Mythos 5.1.

Claude Fable 5.1 is available now through Anthropic, Amazon Web Services, Google Cloud and Microsoft Azure. Developers can access it through the API using claude-fable-5-1.

Claude Mythos 5.1 remains limited to vetted cybersecurity and life-sciences users through Anthropic's trusted-access programs. Stay Connected with ProPakistani.

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For now, claude Fable 5.1 Brings Massive Performance Gains at Lower Cost remains the part of the story worth watching, and further updates are likely as more details are confirmed.