@argofowl: astra has been pretty solid for me after i took my time with the agents.md it's not perfect, nothing is, but i like it a bit more than fable 5.1 right now controversial i know
XSEP 29, 2026
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Released
Claude Fable 5.1
Anthropic · released SEP 01, 2026
CLAIM — WHAT ANTHROPIC SAYS
Anthropic's most advanced model for coding and knowledge work, with the largest gains on terminal-based scientific and engineering work, computer use, and long-horizon agentic tasks. Around 25% cheaper than Fable 5 for typical workloads, with cache reads down 75%.
- Terminal-Bench 4.0
- 55.8%
- Terminal-Bench-Science 0.1
- 52.6%
- OSWorld 2.0 (strict)
- 41.7%
- Humanity's Last Exam (tools)
- 65.0%
- Price / Mtok
- $10.00
REALITY — 10 INDEPENDENT REPORTS
Other
Other
I've asked Claude Fable 5.1 to create 100 HTML files
XSEP 01, 2026
Coding
laude Fable 5.1 has gone absolutely unhinged with the visual aesthetic
XSEP 04, 2026
Claude Fable 5.1 ONE SHOTTED this Call of Duty game.
XSEP 04, 2026
Stop looking at benchmarks for 18 seconds. Watch this. GPT-6 Astra vs Fable 5.1.
also tested on GPT-6 Astra
XSEP 04, 2026
Fable 5.1 is NUTS at Game Design.
XSEP 02, 2026
A few notes on Anthropic's new Claude Fable 5.1
XSEP 02, 2026
Another Fable 5.1 result , flappy Bird
XSEP 02, 2026
I made this ARC Survival game with just 1 prompt
XSEP 01, 2026
Claude Fable 5.1 High vs Fable 5 high in claude code
also tested on Claude Fable 5
XSEP 01, 2026