OpenAI cuts GPT-5.6 Luna and Terra prices, adds Fast mode for Sol

OpenAI’s GPT 5.6 Luna has become a much more consequential model overnight. On July 30, OpenAI announced an 80% price reduction for Luna and a 20% reduction for Terra. Luna now costs $0.20 per million input tokens and $1.20 per million output tokens. At launch, the official GPT 5.6 announcement listed Luna at $1 per million input tokens and $6 per million output tokens. That is the headline. The deeper story is that Luna is not one fixed capability number. It has an inference-time effort curve. The model can answer quickly with no reasoning, or spend far more tokens exploring, checking, and revising before it returns an answer. The quality gain can be substantial, but so can the effective cost and latency. [...] The important practical change is not only the API invoice. OpenAI says the lower Luna and Terra prices are also reflected in how usage is counted against paid subscriptions in Codex and ChatGPT Work. Subscription prices and quota budgets remain unchanged, but the same amount

Starting today, GPT‑5.6 Luna, our fastest and most affordable model, will cost 80% less, while GPT‑5.6 Terra, our balanced model for everyday work, will cost 20% less. These lower prices for Luna and Terra are also reflected in how usage is counted against paid subscriptions when using Codex and ChatGPT Work. Luna gives businesses a far more cost-effective way to handle high-volume work at very high levels of quality. It can use tools and complete multi-step workflows, making a broader range of AI applications practical to run at scale. [...] Yesterday, we shared how GPT‑5.6⁠ helped make itself more efficient to run⁠. Today, we’re passing those gains on to customers with lower prices for GPT‑5.6 Luna⁠(opens in a new window) and Terra⁠(opens in a new window) and faster performance with GPT‑5.6 Sol⁠ in the API. Together, these updates help customers get more from every dollar they invest in AI and move faster when time matters. [...] ## Availability and pricing GPT‑5.6 Terra and Luna re

Share Efficient by default, maximum performance on demand Efficient by default, maximum performance on demand A leap forward in design End-to-end knowledge work Pushing the frontier on cyber and science GPT-5.6 accelerates OpenAI Scaling safety and security with capability Availability and pricing Efficient by default, maximum performance on demand A leap forward in design End-to-end knowledge work Pushing the frontier on cyber and science GPT-5.6 accelerates OpenAI Scaling safety and security with capability Availability and pricing Video 1 00:00 03:27 _Update on July 30, 2026:__OpenAI reduced the price of GPT‑5.6 Luna by 80% and GPT‑5.6 Terra by 20%.__Learn more here__._ [...] Read more about our safeguards in the updated GPT‑5.6 system card⁠(opens in a new window). ## Availability and pricing GPT‑5.6 spans three model tiers: Sol, our flagship; Terra, a lower-cost model with performance competitive with GPT‑5.5; and Luna, our fastest

in China, GLM 5.5 being one of them. And GLM 5.2 was a pretty successful model. Even though it might not be number one on benchmarks, it's still a pretty capable model. So, if GLM 5.5 is successful as it sounds, at least at the moment, being much more stronger, two times larger, then it's going to be a fun model to play around with. So, let's see when it comes out. It looks like OpenAI is on a roll this week because today, once again, they dropped something new. No, it's not a new model, but I think it's more important than just a new model. Starting today, they are reducing the price of GPT 5.6 Luna by 80% and GPT 5.6 Terra by 20% and they're also giving a faster option for GPT 5.6 Soul in the API. And this is all possible because of something I talked about yesterday. GPT 5.6 Soul [...] # GPT 5.6 Sol Fast Mode, OpenAI Cut Prices 80% and GLM 5.5 Is Coming! ## Universe of AI 28000 subscribers 385 likes ### Description 17210 views Posted: 30 Jul 2026 OpenAI cut GPT 5.6 Luna pricing by

Log inSign up ## Post user avatar We are committed to pushing the model frontier across cost efficiency, capability, and speed. Starting today, we are reducing prices for GPT-5.6 Luna by 80% and GPT-5.6 Terra by 20% , and offering a faster option for GPT-5.6 Sol in the API. Luna and Terra’s lower prices are reflected in how usage is counted in Codex and ChatGPT Work, so your usage goes further. 5:17 PM · Jul 30, 202611.4MViews user avatar OpenAI @OpenAI Jul 30 Along with the price reduction on GPT-5.6 Luna and Terra, Fast mode for GPT-5.6 Sol in the API delivers up to 2.5x the speed of Standard processing at 2x the Standard price. Fast mode gives API customers faster access to GPT-5.6 Sol, with no change in intelligence. 280K user avatar OpenAI @OpenAI [...] 280K user avatar OpenAI @OpenAI Jul 30 We’re also upgrading Auto-review in the ChatGPT app and Codex CLI from GPT-5.4 to GPT-5.6 Luna. Combined with Luna’s new price, we expect A

This story is a summary of posts on X and may evolve over time. Grok can make mistakes, verify its outputs. ## Related Trending Stories on X Devs Debate: Skip Reading AI-Generated Code? News · 9.1K posts OpenAI Rolls Out GPT-Live Voice and GPT-5.6 Models for ChatGPT News · 141.5K posts user avatar OpenAI @OpenAI Jul 30 We are committed to pushing the model frontier across cost efficiency, capability, and speed. Starting today, we are reducing prices for GPT-5.6 Luna by 80% and GPT-5.6 Terra by 20% , and offering a faster option for GPT-5.6 Sol in the API. Luna and Terra’s lower prices are 7.3M user avatar Sam Altman OpenAI @sama Jul 30 [...] user avatar OpenAI @OpenAI Jul 30 We are committed to pushing the model frontier across cost efficiency, capability, and speed. Starting today, we are reducing prices for GPT-5.6 Luna by 80% and GPT-5.6 Terra by 20% , and offering a faster option for GPT-5.6 Sol in the API. Luna and Terra’s lower prices are 180K user