Anthropic's latest release, Fable and Mythos 5.1, marks a significant milestone in the company's efforts to make its AI models more affordable and efficient. The new models, which are essentially the same but with different safeguards, offer a 75% reduction in cache read prices, dropping from $1 per million tokens to $0.25 per million tokens.

The reduced pricing is expected to cut typical workload costs by about 25% and agentic ones by up to 45%. This move is likely to make Anthropic's models more competitive in the market and attract a wider range of users. The company has also reported significant improvements in the models' performance, with Fable 5.1 scoring 52.6% on Terminal-Bench-Science 0.1 and 55.8% on Terminal-Bench 4.0, outperforming its predecessor.

Mythos 5.1, which is only available to registered Anthropic partners engaged in cybersecurity or life sciences research, has been rated as "low-risk" for concerns related to automated AI development. The model's system card notes that it is less likely to ignore explicit constraints, hallucinate inputs, or falsely claim to have completed tasks than previous models. However, it is slightly more prone to misbehavior than Opus, possibly due to its enhanced capabilities.

Anthropic has also introduced a watermarking system for its models, as required by the EU AI Act. The watermark is invisible without a detection tool and does not carry any information about the user. The company has made the detection API available in private preview for eligible organizations, including regulators, law enforcement, and fact-checkers.

The release of Fable and Mythos 5.1 marks an important step forward for Anthropic, as the company continues to push the boundaries of AI development and make its models more accessible to a wider range of users. With its focus on performance, affordability, and transparency, Anthropic is well-positioned to remain a major player in the AI market.

This article was written with the assistance of AI.
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