---
title: "Claude Fable 5.1"
type: entity
entity_type: model
url: https://frontiernewswire.com/models/claude-fable-5-1
updated: 2026-09-22T00:00:00.000Z
---

# Claude Fable 5.1

Canonical: https://frontiernewswire.com/models/claude-fable-5-1

- **Type:** Model
- **Signals:** 10
- **First seen:** Sep 1, 2026
- **Last seen:** Sep 21, 2026

## Recent signals

- [Introducing Claude Opus 5.5](https://frontiernewswire.com/s/introducing-claude-opus-5-5-cfbcc4ec) (Sep 21, 2026)
- [OpenAI prices GPT-6 Astra at $10/1M input tokens and $50/1M output tokens, matching Anthropic's pricing for Claude Fable 5.1 (The Deep View)](https://frontiernewswire.com/s/openai-prices-gpt-6-astra-at-10-1m-input-tokens-and-50-1m-output-254da268) (Sep 3, 2026)
- [Muse Spark 1.3 with max reasoning, in limited preview for partners, scores 62 on the Artificial Analysis Intelligence Index, behind only Fable 5.1 and Opus 5 (@artificialanlys)](https://frontiernewswire.com/s/muse-spark-1-3-with-max-reasoning-in-limited-preview-for-partners-904c8565) (Sep 2, 2026)
- [Claude Fable 5.1 made me a really nice animated pelican](https://frontiernewswire.com/s/claude-fable-5-1-made-me-a-really-nice-animated-pelican-v6cb14383) (Sep 1, 2026)
- [Anthropic says Fable 5.1 "will cost an estimated 25% less than Fable 5 for typical workloads" and up to \~45% less for "highly agentic work" (Zac Hall/9to5Mac)](https://frontiernewswire.com/s/anthropic-says-fable-5-1-will-cost-an-estimated-25-less-than-fable-5-57adf887) (Sep 1, 2026)
- [Anthropic prices Fable 5.1 at $10/1M input tokens and $50/1M output tokens, unchanged from Fable 5, and cuts cache read pricing by 75% to $0.25/1M tokens (Frederic Lardinois/The New Stack)](https://frontiernewswire.com/s/anthropic-prices-fable-5-1-at-10-1m-input-tokens-and-50-1m-output-50ff3272) (Sep 1, 2026)
- [Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work](https://frontiernewswire.com/s/anthropic-launches-claude-fable-5-1-and-says-its-up-to-45-percent-v84e4d2c8) (Sep 1, 2026)
- [Claude Fable 5.1 and Mythos 5.1 are Anthropic's first models to watermark text outputs; a detection API is available to eligible groups as required under EU law (Ben Patterson/PCWorld)](https://frontiernewswire.com/s/claude-fable-5-1-and-mythos-5-1-are-anthropics-first-models-to-e958b312) (Sep 1, 2026)
- [Anthropic Releases Claude Fable 5.1 and Claude Mythos 5.1: 52.6% on Terminal-Bench-Science and 75% Cheaper Cache Reads](https://frontiernewswire.com/s/anthropic-releases-claude-fable-5-1-and-claude-mythos-5-1-52-6-on-vfc0348df) (Sep 1, 2026)
- [Anthropic unveils Claude Fable 5.1, which is generally available, and Mythos 5.1, for trusted partners and with cybersecurity and life sciences safeguards (Anthropic)](https://frontiernewswire.com/s/anthropic-unveils-claude-fable-5-1-which-is-generally-available-and-cd62eaf9) (Sep 1, 2026)

## Related

- [Anthropic](https://frontiernewswire.com/companies/anthropic) (Company)
- [Mythos 5.1](https://frontiernewswire.com/models/mythos-5-1) (Model)
- [Fable 5](https://frontiernewswire.com/models/fable-5) (Model)
- [Claude Opus 5](https://frontiernewswire.com/models/claude-opus-5) (Model)
- [AWS](https://frontiernewswire.com/companies/aws) (Company)
- [Claude](https://frontiernewswire.com/models/claude) (Model)
- [Google Cloud](https://frontiernewswire.com/companies/google-cloud) (Company)
- [Project Glasswing](https://frontiernewswire.com/topics/project-glasswing) (Topic)

---

[All models](https://frontiernewswire.com/models) · [Latest Signal](https://frontiernewswire.com/)