GPT-5.6: Sol, Terra & Luna
Which tier, what it costs, how to leave 5.4
As of 2026-10-07: GPT-5.6 (Sol, Terra, Luna) was released on 2026-07-09, but it is no longer OpenAI's newest generation — OpenAI released GPT-6 Astra on 2026-09-03, GPT-6 Sol and GPT-6 Luna on 2026-09-22 and GPT-6.1 Sol on 2026-09-29, and its models page now says to start with GPT-6 Astra if you are not sure. All three GPT-5.6 tiers remain in OpenAI's model catalog; official prices are $4/$20 for Sol (promotional at least through 2026-11-21) and $2/$12 for Terra, with Luna the cheapest of the three. This page keeps the GPT-5.6 tier, billing and 5.4-migration details.
Claude, GPT and Chinese models on one key, billed per token; check /models for callable models.
- Billed per token — live rates on /models
- Pay by card (Visa / Mastercard / AMEX), Apple Pay, Google Pay or crypto
- Self-service: top up and activate instantly
As of 2026-10-07: all three GPT-5.6 tiers are still listed in OpenAI's model catalog, but OpenAI's advice for when you are not sure where to start is now GPT-6 Astra, with GPT-6.1 Sol to balance intelligence and cost and GPT-6 Luna for cost-sensitive, high-volume work. On QCode, gpt-5.6-sol and gpt-5.6-terra are still callable, billed by token (per-model rates on /models); QCode does not currently support gpt-6-luna or gpt-5.6-luna (both removed from /models); please use another GPT model, such as gpt-6.1-sol, gpt-6-sol or gpt-5.6-terra. The ChatGPT-login Codex 5.4 cutoff is a separate official line — see the migration notice on this page.
✅ Confirmed facts
What OpenAI's official release and docs actually confirm.
Default: Terra for daily work
Terra at $2/$12 is the default for most coding work. Sol, now at $4/$20 per the 2026-09-12 archive of the official pricing page (promotional at least through 2026-11-21), is for cross-repo and long agents. Luna at $0.20/$1.20 is volume. Sol Ultra is a high-compute mode of Sol, not a separate price tier.
Quota and scope are searched more than scores
Terminal-Bench 2.1: Sol 88.8% / Terra 84.3% / Luna 82.5%. OpenAI’s @thsottiaux, 2026-07-29 (fetched 2026-08-30): OpenAI has not reduced usage on any subscription plans; Sol was using Codex limits faster than expected; usage limits were reset for all ChatGPT Work and Codex users; typical Sol use should last around 18% longer. The scores stay in the comparison table.
Leaving 5.4: ChatGPT-login 08-31; API key is outside this cutoff
Official wording (2026-07-31; rechecked 2026-08-30, official text still “starting August 31”): ChatGPT-signed-in Codex drops GPT-5.4 / 5.4-mini starting 08-31, mapped to terra / luna. API / Codex-key access is outside this retirement. List prices unchanged as of 2026-08-30.
📌 Preview-era questions, answered at GA
The open questions from the preview, now settled by the GA release.
Context window: 1.05M, now official
OpenAI's docs confirm all three tiers share a 1.05M-token API context window and 128K max output (clients like Codex apply a lower session cap, as with GPT-5.5). The 1.5M figure that circulated during the preview was wrong.
GA date: July 9, 2026
'In the coming weeks' turned out to be July 9 — all three tiers opened to everyone via the API and Codex on the same day.
Cerebras 750 tokens/s: confirmed
OpenAI confirmed Sol shipped on Cerebras in July at up to ~750 tokens/s — the preview-era single-source report proved accurate.
ChatGPT availability
The API and Codex are fully open; GPT-5.6's rollout pace across ChatGPT subscription tiers follows OpenAI's official announcements.
Benchmarks and pricing on this page are cross-checked against OpenAI's official release and docs (last updated 2026-07-10). We refresh this page as official information evolves.
From June 26 preview to July 9 GA
The preview started June 26 with about 20 approved partners; on July 9 all three tiers — Sol, Terra and Luna — opened to everyone via the API and Codex. After that (checked 2026-10-07): OpenAI released GPT-6 Astra on 2026-09-03, GPT-6 Sol and GPT-6 Luna on 2026-09-22, and GPT-6.1 Sol on 2026-09-29.
How to use GPT-5.6 on QCode
QCode is a unified AI-coding API platform for developers; as of 2026-10-07, GPT-5.6 Sol and Terra plus the GPT-6 series are callable.
Sol, Terra and the GPT-6 series
As of 2026-10-07, gpt-5.6-sol and gpt-5.6-terra are callable through QCode, as are gpt-6-astra, gpt-6-sol and gpt-6.1-sol — no re-registering accounts or changing your toolchain. QCode does not currently support gpt-6-luna or gpt-5.6-luna (both removed from /models); please use another GPT model, such as gpt-6.1-sol, gpt-6-sol or gpt-5.6-terra.
One key, many models
A single QCode API key calls both the GPT and Claude families across Codex CLI and other clients, switchable any time.
Stable access in China
Access endpoints optimized for mainland China — low-latency, stable connections, no self-hosted proxy needed.
GPT-5.6 FAQ
Has GPT-5.6 been released?
Yes. OpenAI previewed GPT-5.6 (Sol, Terra, Luna) on June 26, 2026 and made all three tiers generally available to everyone via the API and Codex on July 9, 2026. As of 2026-10-07 it is no longer OpenAI's newest generation: GPT-6 Astra was released on 2026-09-03, GPT-6 Sol and GPT-6 Luna on 2026-09-22, and GPT-6.1 Sol on 2026-09-29.
What's the difference between Sol, Terra and Luna?
Sol is the flagship for the hardest work; Terra matches GPT-5.5-class quality at roughly half the price; Luna is the fastest and cheapest. Sol Ultra is Sol's high-compute mode, not a separate price tier.
How much does GPT-5.6 cost?
Per million tokens (input / output): Sol $4 / $20 (promo at least through 2026-11-21), Terra $2 / $12, Luna $0.20 / $1.20. Cached reads keep a 90% discount.
Can I use GPT-5.6 on QCode?
Yes, as of 2026-10-07: gpt-5.6-sol and gpt-5.6-terra are callable through QCode — just pick the model in Codex CLI or any client; billing is by token, with per-model rates on /models. QCode does not currently support gpt-6-luna or gpt-5.6-luna (both removed from /models); please use another GPT model — for volume work, gpt-5.6-terra. The same key also calls gpt-6-astra, gpt-6-sol and gpt-6.1-sol.
Use GPT-5.6 today
Sign up for QCode — gpt-5.6-sol and gpt-5.6-terra plus the Claude and Chinese-model lineups, all on one key; Luna is not currently supported, so please use another GPT model.
Related reading
GPT-5.6 vs Claude Opus 4.8
Sol vs Opus 4.8 on Terminal-Bench and pricing, side by side.
2026 AI Model Radar
Live status of every frontier model this year — available, preview or restricted.
Sol vs Terra vs Luna: how to choose
Benchmarks, prices and use cases across the three tiers — pick your default.