Anthropic releases Fable 5.2 and Mythos 5.2 with 20% price cut and 30% faster output
Anthropic released Claude Fable 5.2 and Mythos 5.2, describing them as the same underlying model with Fable carrying cybersecurity and biology safeguards for general availability while Mythos is restricted to verified organizations in life sciences and cyber programs. Anthropic says both improve on coding, reasoning and vision, generate outputs up to 30% faster than version 5.1, and cost $8 per million input tokens and $40 per million output tokens, a 20% reduction from $10 and $50. An optional fast mode is priced at $16/$80.
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Anthropic Launches Fable 5.2 and Mythos 5.2 AI Models With 20% Price Cut
Anthropic released two new AI models, Fable 5.2 and Mythos 5.2, on November 10 to strengthen its product competitiveness. Fable 5.2 is designed for more complex software development tasks, hardware operations such as robot control, and coordinating more than 1,000 AI agents simultaneously, making it suited to long-term, complex projects. Mythos 5.2 is available to a limited set of vetted organizations and offers stronger capabilities in cybersecurity and life sciences. Anthropic said both models run faster. Fable 5.2 is priced at $8 per million input tokens and $40 per million output tokens, a 20% reduction from the previous version's $10 and $50. Anthropic also expanded Mythos access to more enterprises in the United States and overseas.
Anthropic launches Mythos 5.2 and Fable 5.2 amid recursive self-improvement concerns
Anthropic released Mythos 5.2 and Fable 5.2 on Monday, saying the models improve in coding, reasoning, and vision and communicate more clearly with users. Fable's input token price drops from $10 to $8 per million, making it cheaper than competitor GPT-6 Astra, and responses return 30% faster across effort levels, with faster inference available at double the price. Fable 5.2 supports zero data retention through Anthropic's Enterprise Frontier Safeguards system. It is Anthropic's first release since a METR report suggested the lab may be approaching recursive self-improvement, finding internal models sped up Anthropic's AI progress roughly 2x, though uncertainties remain. Anthropic notes both models suspect they are being evaluated more often, challenging real-world assessment, and says Mythos 5.2 lacks the ability to act covertly against users despite stronger covert capabilities on some evaluations. Fable 5.2 reportedly solved two open theoretical physics problems and formalized Fermat's Last Theorem.
Read sourceAnthropic releases Claude Fable 5.2 and Mythos 5.2, claiming gains over Opus 5.5
Anthropic announced two new models, Claude Fable 5.2 and Mythos 5.2, which the company says outperform Opus 5.5 in almost every capability it evaluated, including coding, reasoning and vision. According to the post, both models deliver up to 30% faster output than Fable 5.1 and Mythos 5.1 with clearer communication. On FrontierCode 2.0, Fable 5.2 at High effort reportedly matched Opus 5.5 at Max effort for roughly half the cost per task, and at Xhigh it scored highest among released models Anthropic tested. The post also claims 1,000 Fable 5.2 agents formalized the existing proof of Fermat's Last Theorem in 30 hours, versus Opus 5.5 completing 26% in 18 hours with the same setup, and that Mythos 5.2 accurately modeled 28 of 34 tested capsids used to deliver gene therapies. Both models reportedly performed as well as or better than recent Claude models on most alignment measures and were externally evaluated before release. Medium effort is the default in Claude apps and Claude Code.
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Anthropic Releases Claude Fable 5.2 and Mythos 5.2 With Faster Output and Lower Pricing
Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2 on November 9, 2026, describing them as the same underlying model with Fable carrying cybersecurity and biology safeguards for general availability while Mythos is restricted to verified organizations in life sciences and cyber programs. Anthropic says the models improve on coding, reasoning, and vision, generate outputs up to 30% faster than version 5.1, and cost $8 per million input tokens and $40 per million output tokens, with an optional fast mode at $16/$80. Prerelease testing reportedly included a Python-to-Rust production migration, designing three working electronic devices, solving two open black hole physics problems, and formalizing Fermat's Last Theorem in 30 hours. Anthropic says alignment risk remains low and safeguards produce fewer unnecessary blocks, and recommends most users start with Claude Opus 5.5.
Read sourceFable 5.2 and Mythos 5.2 Appear on AWS Bedrock at 20% Lower Prices
A post on X reports that the AI models Fable 5.2 and Mythos 5.2 have appeared in Amazon AWS Bedrock. According to the post, both models are priced 20% cheaper than their 5.1 counterparts, with input cost dropping from $10 to $8 per 1 million tokens and output cost falling from $50 to $40 per 1 million tokens. The post also speculates that Anthropic may be preparing to release something, though no confirmation or official announcement is included in the item.
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