Unverified50% confidenceFactExact time
Slower, detail-oriented models such as Claude Fable 5.1 and GPT-6 Astra are positioned as 'System 2' models.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/20/2026
First Seen
Valid until: 12/19/2026
Sources
Related Entities
Related Claims
UnverifiedIn browser operation capability, GPT-series models (GPT-6 Astra based on Codex) were significantly stronger than Claude Fable 5.1, winning decisively in both the Canva replication and Skool course batch creation scenarios.72% similarUnverifiedGPT-6 Astra has been incorporated into Devin Cloud's model mixture.71% similarUnverifiedUnder comparable performance, GPT-6 Astra's Token cost is approximately half that of Claude Fable 5.1.71% similarUnverifiedBilibili UP host Xiangsu Huanxiang used completely identical prompts to conduct four groups of case studies and eight rounds of testing on GPT-6 Astra and the previous-generation model 5.6, with a cumulative duration of over eight hours.70% similarUnverifiedAccording to OpenAI's Noam Brown, the model involved is similar in scale to GPT-5.6-level, is a model used solely for internal research and trained to be highly persistent and diligent, and is not the next-generation Astra series.70% similar
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