A viral GDPval-AA chart says Opus 5.5 crushes GPT-6 Astra at a tenth of the cost. We check every claim, fix the numbers, and show the fairer comparison.
Key takeaways
- On Artificial Analysis's GDPval-AA test, Claude Opus 5.5 scores 1846 Elo at max effort. GPT-6 Astra scores 1542 at max.
- The viral post's main point holds: on Anthropic's chart, Opus 5.5 is higher than Astra at every cost level where both appear.
- But Opus 5.5 at medium beats Astra at max by just 34 points, at about a fifth of the cost. The post says a tenth.
- The post's Terminal-Bench figures come from Anthropic's own chart, not Artificial Analysis. Independently, the two models are close to tied there.
- At matched cost, the GDPval-AA gap is 210 to 280 points, a stronger finding than the one the post chose.
📖 Read the full guide on Van Data Team → GDPval-AA Chart Fact-Check: Opus 5.5 vs GPT-6 Astra on Cost
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