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OpenAI Anthropic GPT-6 Astra Google MarkTechPost The New Stack

Sunday, 4 October 2026

GPT-6 Astra vs GPT-6.1 Sol vs Gemini 4 Argon vs Claude Fable 5.1: Which Frontier Model Fits Which Job

MarkTechPost 1 week ago 36 ● 3 sources

OpenAI cancelled GPT-6.1 Astra on September 28 after failing internal scope and authorization tests, while GPT-6 Astra remains its top model in this lineup. GPT-6 Astra is listed at $10 per 1M input tokens and $50 per 1M output tokens, and Artificial Analysis estimates it at $4.72 per task versus Claude Fable 5.1 at $9.18 under the same list prices. The comparison shifts model-selection toward Astra for frontier tasks, Sol for high-volume coding, and Argon/Fable for specific constrained-access or cache-dependent use cases.

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