With GPT 6 Sol now also available in Copilot, it is time for the LLM battle to continue and the results are in.
Astra 6 beats Sol 6 – https://github.com/directorcia/general/blob/master/Copilot/Comparisons/20260923-Cowork-GPT6Sol-Grok-eval.md
However, GPT 6 Sol is very cheap at 2,243 credits and that ranks towards the bottom of costs in Cowork as seen here.
Opus 5.5 = 23,494 credits
Astra 6 = 6,067 credits
Fable 5.1 = 3,453 credits
Fable 5 (Preview) = 3,387 credits [Model no longer shown]
Fable 5 (Copilot)(Preview) = 3,373.8 credits [Model no longer shown]
GPT 5.6 Sol = 2,800.50 credits
Sonnet 5 = 2,509.3 credits
Opus 4.8 = 2,487 credits [Model no longer shown]
GPT 6 Sol = 2,243 credits
Opus 5 = 2,240 credits
GPT 5.5 = 1,200 credits
GPT 5.6 Terra = 260 credits
I also decided to pit the recent Claude models against each other and found:
Opus 5.5 beats Fable 5 – https://github.com/directorcia/general/blob/master/Copilot/Comparisons/20260923-Cowork-F51vO55-Grok-eval.md
and it did so quite significantly if you look at the report. Opus 5.5 is clearly superior to Fable 5 according to my rudimentary benchmark. So it is really good but also really (really) expensive.
Remember, all the reports and created documents are here so you can judge for yourself:
https://github.com/directorcia/general/tree/master/Copilot/Comparisons
Let me know what you find.
