Claude Opus 5.5 tops benchmark over OpenAI’s Astra and Fable 5.1
Anthropic’s new model, Claude Opus 5.5, ranked first in the Intelligence Index benchmark by Artificial Analysis, surpassing OpenAI’s GPT-6 Astra and Anthropic’s own Fable 5.1. The index aggregates scores from ten tests, including programming and knowledge-based queries. Opus scored 58 points, while Astra and Fable both scored 53. However, the analysis notes that Astra uses fewer tokens at a…
Key points
- Claude Opus 5.5 scored **58** in the Intelligence Index, ahead of OpenAI’s Astra (**53**) and Fable 5.1 (**53**)
- Opus leads Astra by **11 percentage points** in scientific programming but costs more per token
- Artificial Analysis recommends Astra for cost-conscious users despite lower performance in some tasks
The benchmark tested models at their highest performance settings. While Opus excels in performance, the analysis advises users to weigh cost efficiency—especially since Astra’s token pricing is cheaper than Opus’s, though both remain expensive. Fable 5.1, an older Anthropic model, underperformed in both metrics.
Model pages: Claude Opus 5.5 → · GPT-6 Astra →
The story so far
2 episodes →- Claude Opus 5.5 tops benchmark over OpenAI’s Astra and Fable 5.1this story
External benchmarks: Claude Opus 5.5 overtakes OpenAI’s Astra and Fable 5.1
heise.de · 25 September 2026
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