Fable 5.1
Since Tuesday, September 1 · updated 4 days ago · 4 pieces from 4 sources, in the order they came out.
3 news · 1 analysis
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From the start
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Agents on Rails: Claude Fable 5.1 and GLM 5.3 Flash (formerly known as ox-alpha)
Claude Fable 5.1 dropped yesterday. See how it handles real Rails tasks, and where it landed on the leaderboard today. We also finally have a name for the stealth model from the last round.
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Testing Astra 6 v Fable 5.1 on a Gradle docs bug
On the afternoon of September 7th, claude-fable-5-1 was handed a git repository, a GitHub issue, and fifty turns to fix it. Just over three hours later, gpt-6-astra finished the same assignment in another worktree. Same…
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Open-weight models take 56% of token volume, Astra doubles Fable 5.1 spend
AI Gateway Production Index — September 2026 Every month, AI Gateway routes tens of trillions of tokens between production applications and AI labs. That traffic gives us a view of what AI usage actually looks like in to…
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Tutorial: Benchmarking GPT-6 Astra vs Claude Fable 5.1 vs GPT-5.6 Sol using W&B Weave
Learn how to benchmark GPT-6 Astra, Claude Fable 5.1, and GPT-5.6 Sol with Weave, comparing model quality, latency, cost, and performance across practical evaluation tasks.
Tuesday, September 1
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The story so far.