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Anthropic releases Claude 5.1 with dual safety settings and price cuts · 1 source tracked

By PulseAugur Editorial · [1 sources] ·

Anthropic has released two versions of its Claude model, Fable 5.1 and Mythos 5.1, which are fundamentally the same AI but differ in their safety restrictions. Fable 5.1 is available to all users with stricter safety protocols, while Mythos 5.1 offers loosened restrictions for vetted organizations. This release also includes a significant 75% price reduction on cache reads and enables the public model to discover software vulnerabilities for the first time. AI

IMPACT Dual-model release strategy with adjustable safety layers may set a new standard for AI accessibility and customization.

RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — Anthropic tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic releases Claude 5.1 with dual safety settings and price cuts · 1 source tracked

How we ranked this

Signal score
81 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, product
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — Anthropic tag TIER_1 English(EN) · Breach Protocol ·

    Anthropic shipped one model under two names and two safety settings

    <p>Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 on September 1, 2026, and the two are the same model. The only thing separating them is how tightly the safety layer is wound: Fable 5.1 ships to everyone with cybersecurity and life-sciences restrictions active, while …

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