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21ReasoningProvisional score

GPT-6 Astra

GPT-6 Astra

OpenAI's most capable model: a specialist for the hardest problems, priced like one.

Updated

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The read

Astra sits above the Sol and Luna tiers of GPT-6 and is the model OpenAI points at its most demanding work, with a million-token window and a long thinking budget. It ties for third on the Artificial Analysis index, but human voters rate it well below the cheaper GPT-6.1 Sol, and it shares the top price band in this index with Claude Fable 5.1. OpenAI rates its cyber capability as critical, which shapes what it will and will not do.

Where it shines

  • OpenAI's strongest model on hard reasoning and mathematics
  • Million-token context with a thinking budget you control
  • Backed by the deepest tooling ecosystem of any lab

Worth knowing first

  • Human voters prefer the cheaper GPT-6.1 Sol
  • Shares the highest price per token in the index with Claude Fable 5.1

Index score

84.9

Provisional. This score is read from the product's public capability, not from the one-prompt rebuild the fully reviewed entries went through, so treat it as a placing rather than a verdict.

Craft91
Speed72
Control91
Value70
Rank
21 of 73
Builds
LLMs
Category
Reasoning
Output
Text, code and tool calls over an API
Pricing
Paid only
Best for
Research-grade reasoning where depth matters more than cost

Scores are our own editorial judgement, weighted craft 55, speed 10, control 15 and value 20.

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