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
9 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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This text was published by heise.de and written by Vladyslav Shyrinskyi. It is reproduced here with attribution so you can read it in full; the rights remain with the publisher. Read it at the source ↗
Coverage and discussion
8sources- Claude Opus 5.5 follows 'writing instructions'. A template of text rules to paste for work [As of September 2026]Press · note.com ·
- Opus 5.5 is out. You can use an AI that surpasses Fable for 3,600 yen a monthPress · note.com ·
- Is the "Highest Performance AI" Really the Best for Work? What I Learned by Testing Claude Opus 5.5 and GPT-6 Astra on the Same TasksPress · note.com ·
- Don't Read AI Price Lists by the Headline Numbers: The 'Effective Unit Price' Revealed by Claude Opus 5.5 and GPT-6 AstraPress · note.com ·
- GPT-6 vs Claude Opus 5.5 | Generative AI Enters a New Era. Don't Be Fooled by 'Strongest AI' Auto-Posts on XPress · note.com ·
- How to compare Claude Opus 5.5 and GPT-6 Astra for a single task using 4 columnsPress · note.com ·
- [AI] Claude Opus 5.5 and GPT-6 Sol have arrived. What are the differences and how do they compare?Press · note.com ·
The headline, key points and digest above were generated by Digest AI's editorial model from the linked sources. Automated summaries can contain errors: the sources are the record. Spotted a mistake? Tell us. Published by Martin K., who runs Digest AI and handles corrections.
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