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[ARTICLE · art-122735] src=simonwillison.net ↗ pub= topic=generative-ai verified=true sentiment=· neutral

The Pelican comparison grid for Astra is pretty interesting

Simon Willison's comparison grid of AI-generated pelicans shows OpenAI's GPT-6 Astra produces significantly better images than GPT-5.6 Sol, Terra, and Luna across all reasoning levels, with Astra low outperforming any GPT-5.6 Sol model for 9.55 cents. Astra costs about twice as much as Sol ($10/million input, $50/million output vs. $5/$30) but uses fewer tokens, narrowing the price gap. Willison notes Astra and Luna both used 16 input tokens versus 26 for Sol and Terra, suggesting a possible closer relationship between Astra and Luna.

read1 min views17 publishedSep 4, 2026

I got access to GPT-6 Astra this afternoon, so naturally I used it to generate SVGs of pelicans riding bicycles - at low, medium, high, xhigh and max reasoning levels (Astra doesn't support reasoning=none). Then I rendered those pelicans in a comparison grid with GPT-5.6 Sol, Terra, and Luna, and beyond being fun the result was surprisingly useful.

See the grid for full quality images. Here's the transcript that created the GPT-6 Nova pelicans.

There are a few interesting things that stand out from this grid.

  • The Astra pelicans are much better . The very best GPT-5.6-Sol pelican (I liked xhigh better than max) is still pretty clearly a bunch of abstract shapes. Every single one of the Astra pelicans, from low to xhigh, looks better than that. The Astra max one is really good.
  • Astra below max still doesn't reliably get the pelican legs on both sides of the frame.
  • In terms of cost, Astra may be around twice the price of Sol ($10/million input, $50/million output, compared to $5/$30 for Sol), but it uses significantly less tokens at each of the levels, making the prices at the different levels closer than they might otherwise be.
  • Astra low produces a better pelican than ANY of the GPT-5.6 Sol models at any level, for 9.55 cents. Spending 10 cents on any other model gets a much worse result.
  • Look at the input token counts: Astra and Luna both used 16 input tokens, Sol and Terra used 26. That's interesting.

I wonder if Astra and Luna are more related to each other than OpenAI let on?

Tags: ai, openai, generative-ai, llms, pelican-riding-a-bicycle, gpt-6-astra

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