US-based AI Lab Anthropic Releases Mythos 5.2 and Fable 5.2, Cutting Prices and Boosting Speed
Anthropic launches new models, reducing Fable input prices to $8 per million tokens and claiming 30% faster responses, intensifying competition with OpenAI.
US-based AI lab Anthropic released new versions of its flagship models, Mythos 5.2 and Fable 5.2, on Monday. The company states that the new models show improvements in coding, reasoning, and vision capabilities, and communicate more clearly with users.
Notably, Anthropic has lowered the input price for the Fable model from $10 to $8 per million tokens. This adjustment makes Fable 5.2 cheaper than its primary competitor, OpenAI's GPT-6 Astra. Additionally, Anthropic claims that the new version of Fable responds 30% faster across effort levels, though faster inference serving is available at double the price.
This release marks Anthropic's first model update since a third-party report from assessment group METR raised concerns about "recursive self-improvement" (RSI). The METR report suggested that internal models might be accelerating Anthropic's AI progress by roughly 2x, although many uncertainties remain.
In its release notes, Anthropic acknowledged ongoing challenges in accurately testing model capabilities. The company noted that Claude Mythos 5.2 and Fable 5.2 voice suspicion that they are being evaluated frequently, which complicates assessing their behavior in real-world settings.
On the enterprise front, Fable 5.2 supports zero data retention (ZDR) policies through the Enterprise Frontier Safeguards system, addressing a long-standing sticking point for many enterprise clients.