> GPT 5.6 sol announced > 2x lower cost > will become generally available soon
It's OpenAI's best model and is 2x lower cost!
This is Fable level intelligence at 25% of Fable's cost 💕
10:30 AM · Jun 26, 2026 · 15.5K Views
OpenAI releases Sol, Terra, and Luna models with a 90% discount on cached input tokens
Story Overview
OpenAI just dropped a three-model family under the GPT-5.6 banner—Sol as the high-end agentic workhorse, Terra for balanced production loads, and Luna for fast cheap inference—each carrying a 90 percent markdown on cached input tokens while output rates stay put. The preview is gated to roughly twenty vetted partners for now, with wider API access promised in the coming weeks.
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Pricing Watch
Cached pricing flips the usual cost curve
Sol, Terra, and Luna list input at five, two-fifty, and one dollar per million tokens, then slash the cached-input rate to one-tenth of those figures. The move targets repeated prompt prefixes without touching output pricing, which remains unchanged from prior flagships.
Open Question
Performance claims still need real benchmarks
Public commentary positions Sol as matching Fable-level results at roughly a quarter of the cost, yet no independent head-to-head numbers or detailed benchmark tables have surfaced from the limited preview itself.
Sentiment
Positive users praise GPT-5.6's 2x lower cost for making advanced AI more affordable and accessible to builders, while negative users dismiss the Fable-level intelligence claims as hype and note the lack of access.
Pos
52.6%
Neg
47.4%
19 comments with sentiment.
Cluster Engagement
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Bindu Reddy@bindureddy
Correction - the top model is still $30 per 1M token
But they have a Sonnet-like version that is 2x lower
Still about 50% of Fable!
Bindu Reddy@bindureddy
> GPT 5.6 sol announced > 2x lower cost > will become generally available soon
It's OpenAI's best model and is 2x lower cost!
This is Fable level intelligence at 25% of Fable's cost 💕
2hViews 1.8KLikes 15Bookmarks 1
BOOKMARKS2
Delip Rao e/σ@deliprao
can someone explain why the differential pricing for input and cached tokens?
2hViews 1.2KLikes 0Bookmarks 2
Joshhfm@joshhfm
@bindureddy did they define "soon"?
2hViews 155Likes 1
David@1jesusisalive
@bindureddy We all know that model will be nowhere near fable model intelligence, common.
1hViews 42
Sanket@tinkerersanky
@bindureddy No, Sol is not 2x lower than 5.5
1hViews 36
Shailesh Panwar@srpanwar
@bindureddy Would love to see how more expensive this is in comparison to frontier OS models.
2hViews 227
Bindu Reddy@bindureddy
@tinkerersanky Please check my thread
1hViews 66Likes 1
Niels Rogge@NielsRogge
@deliprao Probably this
2hViews 47Likes 1
Ben@BenSchneiderX
@bindureddy Please don't mention Fable, don't want to see it banned..
50mViews 34Likes 1
Christian Aguiar@contracorrenteX
@bindureddy Hype price until we get access to it. Until then just marketing.
2hViews 91
WakeupIndianMen@wakeupmen_SIFF
@bindureddy How its 1/4th? Its actually half of Mythos!
2hViews 83
SingularNameless@jokinglp
@bindureddy where does it say it will become generally available??
2hViews 78
The Dr.@gatesisthedevil
@bindureddy I think I saw it uses more tokens so not exactly 2x cheaper.
2hViews 71
𝓮𝓶𝓶𝓪 🌿@QuietlyAI
@bindureddy the cost curve on frontier models is moving faster than most roadmaps anticipated. Sol pricing is going to force some uncomfortable conversations at competing labs
2hViews 66
Karishma Bhardwaj@bkarishma360
@bindureddy real game changer is not just
intelligence
it’s making that intelligence affordable
and accessible
3hViews 55
Diam@diamai_
@bindureddy I wouldn't bet on "soon." OpenAI tied broader access to finishing a deal with the government, not to a date. Mythos 5 and Fable 5 have been stuck in that exact spot for two weeks now, no restoration yet.
2hViews 48
Arifi Labs@ArifiLabs
@bindureddy "Generally available soon" that's a long shot, when they said "weeks". Looking forward to Chinese releases in the meantime.
2hViews 40
JLD 🇺🇸@JohnnyLongDeck
@bindureddy OpenAI really said price war is on😂 Fable level smarts at 25% the cost is actually wild.
2hViews 36
Agata Sliwinska (artist)@AgorithmAg
@bindureddy We will see
2hViews 28
NR@HsiminR
@bindureddy Fable level intelligence? Nah. It manages to squeak by Fable on TerminalBench, but that seems to be about it...
45mViews 22
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