GPT-6 Astra edges past Claude Fable 5.1 on WebDev Arena
As of September 5, OpenAI’s GPT-6 Astra sits on top of Code Arena’s WebDev leaderboard, 35 points ahead of the recently released Claude Fable 5.1. The gap reads 1,797 to 1,762 on a crowdsourced Elo-style rating.
The write-up credits Astra with reshaping the Pareto frontier as “the best-performing model at $40/Mtoken”, pricing that matches the latest Claude model. Fable 5.1 arrived days earlier and took first place in the Artificial Analysis Intelligence Index.
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Claude’s raw thinking never leaves the server
Asked to name the tag wrapping its reasoning, Claude got cut off mid-token. Shifted by +3, the answer came through as dqwpo:wklqnlqj, or antml:thinking, since the real-time filter only matches literal bytes.
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