Claude Fable 5.1
Claude Fable 5.1 is a language model from Anthropic, first covered on 20 September 2026. It is available in a consumer app.
Last updated
At a glance
- Made by
- Anthropic
- Type
- Language model
- Availability
- Consumer app
- Licence
- Not stated
- Context window
- Not stated
- First seen
- 20 September 2026
Taken from the coverage, not from our own testing; "not stated" means none of the reports we read gave it. All tracked models →
13 stories about Claude Fable 5.1
-
Opinion: M5 Ultra Mac Studio enables fast local AI agents, reviewer says
The reviewer tested Apple’s M5 Ultra Mac Studio with 256 GB of unified RAM, comparing it to the previous M3 Ultra (512 GB) and a desktop PC built around an RTX 5090 GPU. Using local models such as Qwen3.8‑Flash‑Next,…
1 sourcemacstories.net -
Anthropic cuts Claude Fable 5.1 cache read costs by 75%
Anthropic announced the release of Claude Fable 5.1 and Claude Mythos 5.1 on September 1, 2026. While the two models share the same underlying architecture, Mythos 5.1 is restricted to trusted organizations in…
1 sourcenote.com -
Opinion: I remain unconvinced that true recursive self‑improvement will happen soon
The author argues that the hype around rapid recursive self‑improvement (RSI) is overstated. He notes that only two frontier labs—OpenAI and Anthropic—are deploying thousands of concurrent agents, and that this culture…
1 sourceInterconnects -
OpenAI's GPT-6 Astra and Anthropic's Claude Fable fail safety test in RoboHarm benchmark
Researchers at Robocurve introduced the RoboHarm benchmark to test whether AI models refuse dangerous commands when controlling robot arms. They evaluated three leading models—OpenAI's GPT-6 Astra, Anthropic's Claude…
2 sourcesTom's HardwareThe Decoder -
Business leaders at Dreamforce say older AI models are sufficient for today
At Dreamforce in San Francisco, Salesforce CEO Marc Benioff hosted a panel with Anthropic, OpenAI and Nvidia CEOs that turned the AI safety debate into a practical discussion. Jensen Huang urged labs to "run as fast as…
1 sourceCNBC Technology -
TypeSafe AI says Jev is 193.6x faster than Claude Sonnet 5
On September 15, 2026 TypeSafe AI unveiled Jev, a model that deliberately avoids generating any text. Led by Diogo Almeida, a co‑author of the InstructGPT paper, the project emerged from two years of stealth…
10 sourcesnote.comMarkTechPost -
Good Start Labs Uses Strategy Games to Train AI Models for Real-World Tasks
Good Start Labs, spun out of Every, uses strategy games like Diplomacy and 1830 to fine‑tune large language models. The idea came after watching frontier models play Diplomacy on Twitch in 2025. They found that…
1 sourceLatent Space -
Claude Fable 5.1 solves 370-year-old Cyphral Distich cipher
Anthropic’s Claude Fable 5.1 has successfully deciphered the Cyphral Distich, a cryptogram embedded in Sir Thomas Urquhart’s 1653 work Logopandecteision. The puzzle, which has remained unsolved for centuries and was…
1 source HN 97vals.ai -
Datasette Security Patches Released
On September 11, 2026, Datasette, a database server, released two security patches: 1.0a39 and 0.65.4. These updates address vulnerabilities found through an extensive security audit conducted by Claude Fable 5.1,…
1 sourceSimon Willison -
Claude Fable 5.1 shows longer, less hedged responses than Fable 5
Anthropic’s latest Claude model, Fable 5.1, has shifted its writing style compared with the earlier Fable 5. An analysis by Arena.ai of tens of thousands of high‑reasoning Text Arena outputs found the new version uses…
1 sourceThe Decoder -
DeepSeek V4.1 Flash outperforms GPT-6 Astra on design tasks at a fraction of the cost
- DeepSeek V4.1 Flash has been benchmarked against top AI models like GPT-6 Astra and achieved an impressive score of 81.2 out of 100, matching nearly 99% of GPT-6 Astra's performance on real-world design tasks. -…
1 sourcedecrypt.co -
Claude Platform: Cost Reduction and Performance Improvement
Anthropic Engineering's Claude Platform has introduced new features to reduce costs and maintain or improve application performance. The key fixes include maximizing prompt cache hit rates, removing anti-patterns in…
1 source primary sourceAnthropic Engineering -
Video Compressor Tool Using FFmpeg WebAssembly
This article introduces a new video compressor tool that allows users to compress videos directly in their browser. The tool uses FFmpeg compiled to WebAssembly, enabling users to upload a video file and generate…
1 sourceSimon Willison
