OpenAI Launches GPT-6 Sol and Luna at Half the Price

On September 23, OpenAI officially released two new models in the GPT-6 family, GPT-6 Sol and GPT-6 Luna. They went live the same day in ChatGPT Work and Codex (covering Plus/Pro/Business/Enterprise/Edu users) and opened up via API (gpt-6-sol and more). Built on the technical foundation of GPT-6 Astra, the two models target faster, cheaper performance for large-scale workloads. Sam Altman made the announcement personally, calling them the next generation of the GPT series and a powerful shake-up of the AI model pricing landscape.

Confirmed

• Sam Altman's announcement: Sol and Luna deliver significant gains over the 5.6 series in intelligence, alignment, work output, coding, and computer operation, at half the per-token price and lower per-task compute cost; the OpenAI developer account confirmed API pricing is 50% below GPT-5.6, with the positioning "build with Sol, scale with Luna."
• Specific pricing: per kimmonismus's roundup, Sol costs $2 input / $10 output, Luna $0.10 input / $0.50 output per million tokens; polynoamial noted this is 50% below even GPT-5.6's promotional pricing.
• Availability: OpenAI announced Free and Go users can use Luna in the desktop app.
• Performance data: per reachvb and official figures, Sol (xhigh) beats competitors on AutomationBench at 9% of the cost; Sol scores 48.4% on FrontierCode (xhigh); GPT-6 Luna Max matches GPT-6 Sol High and Astra Low on the DeepSWE benchmark at roughly 1/3 of Sol's price; officially, task costs on some coding evaluations are up to 93% cheaper than Claude Opus 5.

Unconfirmed

• Polymarket cautions that comparisons like "93% cheaper than Claude Opus 5" come from official claims and still await third-party benchmark verification.
• Pricing screenshots posted by some users (e.g., yeshvvanth) should be checked against OpenAI's original announcements.

Why it matters

• Sam Altman added that measured by per-task pricing, GPT-6 Sol and Luna "have no competition in the market," and he wants users to consume heavily; the community sees the aggressive pricing as pressure on the entire competitive landscape.
• Users like indiantruely believe the pricing "could bury plenty of open and closed models"; ns123abc mocked things up with a "Sir" meme noting Sol's pricing is half of Claude Opus 5.5's — flagship models going head-to-head the same day, with a price war now the talk of AI circles.

2026-09-23 ~ 2026-09-23 · 46 related posts

Full story(4 episodes)→

• Episode 1: Azure configs leak GPT-6 Sol, Luna and Astra Minor, fueling OpenAI release rumors(2026-09-21, 33 posts)
• Episode 2: Codex Leak Hints at GPT-6 Luna, Sol Still Missing(2026-09-22, 2 posts)
• Episode 3: OpenAI Officially Launches GPT-6 Sol and Luna Dual Models(2026-09-23, 10 posts)
• Episode 4: OpenAI Launches GPT-6 Sol and Luna at Half the Price(2026-09-23, 46 posts)

• GPT-6 Sol and Luna API Pricing Leaks: Sol Halves to $2/$10, Luna Drops to $0.10/$0.50 — Angaisb_ · 2026-09-23
• OpenAI launches GPT-6 family with Sol and Luna models — DemiPixel · 2026-09-23
• GPT-6 Sol and Luna are live: OpenAI ships new model pair — DemiPixel · 2026-09-23
• GPT-6 Sol and Luna pricing lands, Reddit says it could bury rival models — indian_truely · 2026-09-23
• GPT-6 Sol and GPT-6 Luna Officially Released as Dual Launch — soumitrashukla9 · 2026-09-23
• GPT 6 Sol and Luna pricing leak: 6 Sol at one-third the price of 5.6 — yeshvvanth · 2026-09-23
• GPT-6 Sol claimed to cost 50% less than GPT-5.6 Sol — cedric_chee · 2026-09-23
• [source] GPT-6 Sol and Luna roll out in ChatGPT Work, Codex, and API — OpenAI · 2026-09-23
• OpenAI launches GPT-6 Sol and Luna: Sol beats Opus 5 at 9% of the cost — reach_vb · 2026-09-23
• OpenAI's Sol and Luna join GPT-6 family: better than GPT-5.6 at half the price — stevenheidel · 2026-09-23
• GPT-6 Sol and Luna launch with API prices 50% below GPT-5.6 — OpenAIDevs · 2026-09-23
• OpenAI credits caching and inference gains for GPT-6's 50% price cut — OpenAIDevs · 2026-09-23
• OpenAI launches GPT-6 Sol and Luna: near Fable 5 on DeepSWE at up to 96% lower cost — OpenAIDevs · 2026-09-23
• OpenAI launches GPT-6 Sol and Luna: faster models with 50% cheaper API — VraserX · 2026-09-23
• GPT-6 Sol leads AutomationBench over Fable 5.1 at 88% lower cost per task — OpenAIDevs · 2026-09-23
• GPT-6's improved prompt caching cuts agent costs; leads AutomationBench at 88% less — OpenAIDevs · 2026-09-23
• OpenAI says GPT-6 Sol/Luna improve on GPT-5.6 in alignment evals via Astra advances — OpenAIDevs · 2026-09-23
• GPT-6 Sol and Luna Priced at Half of GPT-5.6 Rates — No_Hovercraft6239 · 2026-09-23
• GPT-6 benchmarks: Sol matches Fable 5.1 at ~85% less cost per task — kimmonismus · 2026-09-23
• GPT-6 Sol/Luna Benchmarks Leak: ~85% Cheaper Per Task Than Fable 5.1 — kimmonismus · 2026-09-23
• OpenAI Rolls Out GPT-6 Sol and Luna to All Paid ChatGPT Tiers Today — aziz4ai · 2026-09-23
• OpenAI: GPT-6 Sol beats Claude Opus 5 on AutomationBench at 9% of the cost — MaziyarPanahi · 2026-09-23
• GPT-6 Sol and Luna launch with strong coding at lower prices — cedric_chee · 2026-09-23
• 'Sir, Altman just dropped GPT-6 Sol at half the price of Opus 5.5' meme — ns123abc · 2026-09-23
• [source] Sam Altman announces GPT-6 Sol and Luna: major upgrades at half the price — sama · 2026-09-23
• OpenAI launches GPT-6 Sol and Luna, permanently cuts API prices 50% — aziz4ai · 2026-09-23
• Polymarket: GPT-6 claims up to 93% cheaper coding task costs than Claude Opus 5 — Polymarket · 2026-09-23
• Altman: GPT-6 Sol and Luna have no competition on per-task pricing — sama · 2026-09-23
• GPT-6 Luna Max matches Sol High on DeepSWE at 3x lower price — Internet--Sensation · 2026-09-23
• OpenAI posts GPT-6 Sol and Luna page with zero details — petrusenko_max · 2026-09-23
• GPT-6 Sol and Luna arrive 50% cheaper, Luna now best value — PaulShellDev · 2026-09-23
• GPT-5.6 Sol and Luna now 50% off, with Luna competitive against DeepSeek — bindureddy · 2026-09-23

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