GPT-6 Astra vs Fable 5.1 depends on whose scoreboard you read. OpenAI's table favors Astra, the independent index favors Fable. Here is the honest comparison.
Key takeaways
- GPT-6 Astra vs Fable 5.1 has no single winner: on OpenAI's own launch table Astra leads most rows, but on the independent Artificial Analysis Intelligence Index Fable 5.1 leads 66 to 61.
- Even OpenAI's own comparison shows Fable 5.1 winning Humanity's Last Exam with tools, 65.0% to 57.2%, so the "Astra sweeps" headline isn't quite true.
- The sticker price is identical at $10 input and $50 output per million tokens, but cache reads diverge 4x: Fable 5.1 at $0.25 per million versus Astra at $1.00.
- Astra's strongest ground is frontier math, cybersecurity, and computer use; Fable 5.1's is the independent composite score, agentic coding, and cache economics.
- Every head-to-head figure below is vendor-reported unless marked independent, so the safest move is to test both on your own tasks and compare cost per completed task.
📖 Read the full guide on Van Data Team → GPT-6 Astra vs Fable 5.1: Two Scoreboards, Two Winners
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