So with GPT-6 Astra, Codex introduced an experimental feature for context management that’s supported to be beneficial for long conversations. Will that experimental feature now also apply to Sol and Luna?

https://community.openai.com/t/experimental-context-manageme...

I would also like to point out that it was quite predictable that Terra got discontinued, it didn’t make sense to have it when both Sol and Luna overlapped it.

Lunas insane discount is a game changer, OpenAI knows what they are doing here. Luna at max reasoning effort, even though its not optimal for long conversations, its incredibly intelligent while dirty cheap. Its not even competition anymore.

Whats even crazier is that I’ve underestimated how good Luna actually is. I’ve seen colleges create fantastic things with just Luna medium. This basically means you never have to think about your Codex usage anymore. You can run all day and not

have to worry about your 5h or weekly usage limit. To me, the discounts OpenAI is offering with Sol and Luna is truly a new milestone.

Since I spent my morning fixing a bug in my OpenAI API proxy that completely broke prompt caching and caused my usage limits to burn like kindling, really happy to see some of their new cache tooling:

* Prompt caching dashboard: https://platform.openai.com/usage?usage_section=prompt-cachi...

* Adjust reasoning effort and tool availability without breaking cache

6 Sol Performs worse than 5.6 Sol at DeepSwe?

Wierd!!

We tested this on our agentic CAD coding harness. This seems like a decent improvement vs 5.6. It's lower costs seems to be offset by more token use so those cancel themselves out, but the actual results for spacial reasoning and coding are an improvement.

https://www.partforge.ai/blog/2026-09-23-new-model-day

I do think after using it for a bit - and nothing against people who like 6 Sol but it really is not working for me. I have to run a check on the code with Astra almost each time. 5.6 was/is much better. 6 Sol is basically Opus 5 (not the new 5.5 which is amazing) ... OpenAI had a nice lead with Astra - this Sol model is a big step back IMO.

Luna really is "intelligence to cheap to meter" by now

I think Opus is positioned more vs Astra now, after the price changes, and it is doing well there (on benchmarks). Sol now has the same pricing as Sonnet.

A good improvement overall.

GPT-6 Luna now is 50% cheaper, which makes it have one of the best intelligence per cost ratios.

GPT-6 Sol is smarter, but seems to reason 2x more than GPT-5.6, which makes it 2x slow3r and 25% more expensive in practice.

[0]: https://aibenchy.com/compare/openai-gpt-6-sol-high/openai-gp...

The notable thing is that Luna regressed a bit on coding while dropping 60% in price.That's a fair trade, for high-volume work Luna at that price is basically free, but it does show that newer doesn't always mean better.

This Luna release might potentially be a big deal for computer use automation at scale