Anthropic says Fable 5.1 sets new standards on coding, knowledge work, and long-running problem-solving tasks, and can fix the root causes of software issues (Carl Franzen/VentureBeat)
Fable 5.1 is live in Claude Code and the Claude Platform, with cheaper cache reads and stronger benchmark claims.
Anthropic says Fable 5.1 is generally available, while Mythos 5.1 is limited to trusted partners with safeguards for cybersecurity and life sciences. The company says Fable 5.1 improves coding, knowledge work, scientific research, and long-running tasks. It keeps Fable 5 input and output pricing, but cache reads are 75% cheaper. Anthropic says that cuts typical workload costs by about 25%, and up to 45% for highly agentic work. Techmeme's note
Anthropic says Fable 5.1 is generally available, while Mythos 5.1 is limited to trusted partners with safeguards for cybersecurity and life sciences. The company says Fable 5.1 improves coding, knowledge work, scientific research, and long-running tasks. It keeps Fable 5 input and output pricing, but cache reads are 75% cheaper. Anthropic says that cuts typical workload costs by about 25%, and up to 45% for highly agentic work. Techmeme's note
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