# Anthropic Claude Fable 5.1 and Mythos 5.1 with 75% cost reduction

> Anthropic has refreshed its Claude line with Fable 5.1 and Mythos 5.1, and the headline is price rather than raw intelligence. Cache-read costs, what you pay when a model re-reads context it has already seen, drop by roughly 75 percent to about $0.25 per million tokens, which matters enormously for agents and long-running workflows that reread the same documents thousands of times. The models are not standing still on capability either. Anthropic reports Fable 5.1 scoring 52.6 percent on Terminal-Bench-Science, more than double the prior generation's 24.7 percent, a benchmark meant to test practical scientific and command-line problem solving. The release also ships Enterprise Frontier Safeguards, including customer-controlled encryption aimed at regulated buyers. The interesting signal is competitive. As frontier labs converge on similar quality, the fight is shifting to cost per useful task, and steep discounts on cache reads are a direct play for the developers building expensive, always-on agents where token math decides what is affordable.

_Section: [Daily AI Updates](https://www.wortins.com/daily-ai) · Source: VentureBeat · Published Saturday, September 5, 2026_

## Wortins' read

Anthropic has refreshed its Claude line with Fable 5.1 and Mythos 5.1, and the headline is price rather than raw intelligence. Cache-read costs, what you pay when a model re-reads context it has already seen, drop by roughly 75 percent to about $0.25 per million tokens, which matters enormously for agents and long-running workflows that reread the same documents thousands of times. The models are not standing still on capability either. Anthropic reports Fable 5.1 scoring 52.6 percent on Terminal-Bench-Science, more than double the prior generation's 24.7 percent, a benchmark meant to test practical scientific and command-line problem solving. The release also ships Enterprise Frontier Safeguards, including customer-controlled encryption aimed at regulated buyers. The interesting signal is competitive. As frontier labs converge on similar quality, the fight is shifting to cost per useful task, and steep discounts on cache reads are a direct play for the developers building expensive, always-on agents where token math decides what is affordable.

## Source

[Read the full story at VentureBeat](https://venturebeat.com/technology/anthropics-claude-fable-5-1-and-mythos-5-1-arrive-with-a-75-cost-reduction-for-fable-cache-reads)

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