Anthropic upgrades Claude with new Fable 5.1 model, details here
Anthropic says the model is up to 25% cheaper for typical workloads and up to 45% cheaper for highly agentic tasks.
- Three months after the original launch, Anthropic is enhancing Claude with its new Fable 5.1 model upgrade, which improves coding performance and problem-solving tasks while reducing costs across the API.
- Anthropic first released Fable 5 as its flagship Mythos-class AI model positioned above smaller models like Haiku, Sonnet, and Opus in the Claude lineup.
- Fable 5.1 will cost an estimated 25% less than Fable 5 for typical workloads, with savings reaching approximately 45% for highly agentic work. Anthropic says it "achieves similar or better results than Fable 5 at a much lower cost."
- Alongside the general release, Anthropic is launching Claude Mythos 5.1 for trusted access programs with specialized safeguards designed for cybersecurity and life sciences work.
- In testing by investment firm Millennium, Fable 5.1 found the cause of a rare crash that engineers had struggled to explain for years, demonstrating its root-cause problem-solving capability.
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Anthropic is launching a new version of its powerful Fable artificial intelligence model, which, according to the company, is better at programming and scientific tasks, besides being more economical — changes that it claims to have been made in response to customer feedback. The company reported that Fable 5.1, whose release forecast is still on Tuesday, is more competent in performing long and complex computer programming tasks, such as softwa…
Anthropic's Claude Fable 5.1 Raises the Bar for Agentic AI While Tightening the Guardrails
Anthropic released Claude Fable 5.1 for general use and Mythos 5.1 for vetted researchers on Sept. 1, 2026. The shared model delivers major gains in agentic coding, scientific research and long-horizon tasks while cutting typical costs 25% via cheaper cache reads and sharpening safeguards to reduce false positives by up to 60%.
Anthropic Says New Fable AI Model Is Cheaper, Better at Coding
Anthropic PBC is releasing a new version of its powerful Fable artificial intelligence model that it says is better at coding and science tasks, as well as more economical — all changes it says are in response to customer feedback.
Anthropic Launches Claude Fable 5.1 With Lower Costs and Fewer False Positives
Anthropic today introduced Claude Fable 5.1 and Claude Mythos 5.1, which the company says are the "world's most advanced models for coding and knowledge work". According to Anthropic, Claude Fable 5.1 sets a new standard for coding, knowledge work, and long-running problem-solving tasks. It achieves similar or better results than Fable 5 at low or medium effort, and has much higher performance at higher effort tiers.
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