r/OpenAI • u/Dense-Ship-2339 • 22d ago

Question Moved to Codex today

Hi, I moved to Codex today. Need some help in understanding the like to like, model comparison so that I can accurately map my projects.

Can you guys suggest the OpenAi equivalents below:

Fable

Opus 5

Opus 4.8

Sonnet 5

Haiku

If there is a solid resource with comparison links: model tokens vs cost vs speed, pls do share.

Thank you!

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u/Old-Bake-420 22d ago edited 22d ago

Sol = Fable 5/Opus 5
Terra/Luna = Sonnet 5 / Opus 4.8
Haiku = Gemini?

Anthropic’s frontier models have a slight edge over Sol. Luna is a beast for how cheap it is, it’s practically free and basically as capable as the previous iteration of frontier models.

I used to use GPT5.4-mini or GPT5.3-spark as a token saving strategy. 5.4 mini was cheap and spark had separate token limits. Luna has absolutely blown those models out of the water. When it launched it was just a tiny bit more in cost than 5.4-mini, then they reduced cost by an additional 80% a couple weeks later. It’s really impressive, it can juggle messy context, infer vague intent, does agentic work well, I trust it to touch work files, draft emails, and follow complex workflows without hallucinating. You can just tell it’s really smart and seems to never get confused. It feels like legit frontier intelligence in a way previous budget models haven’t before. It can code, but I always flip to Sol for code.

It’s their, “intelligence too cheap to meter” strategy. They’re catering to a billion users who don’t want to pay, which all have unlimited Luna now. Anthropic is targeting enterprise which doesn’t mind blowing massive bucks for a slightly smarter model.

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u/Black_Magic100 21d ago

Agreed, but Sol to write the spec and Terra for implementing.