GPT-6.1 Release Status: Sol Is Live; What About Astra, Terra and Luna?
Sol is released, Astra's planned launch is reportedly paused, and Terra/Luna 6.1 are unconfirmed. Compare GPT-6.1 status, API IDs, prices and available older tiers.
Published 2026-09-30
GPT-6.1 is not a single model with one release status. GPT-6.1 Sol is released; GPT-6.1 Astra is not publicly released and its planned launch is reportedly on hold. Sol launched on September 29, 2026, with the documented API ID gpt-6.1-sol. The September 28–29 Astra reporting concerns a planned release window, not the withdrawal of Sol or the existing gpt-6-astra. No confirmed public Astra 6.1 API ID, official price or replacement release date is available in the sources checked for this overview on September 30, 2026. A reported pause does not establish permanent cancellation.
GPT-6.1 Terra and GPT-6.1 Luna: unknown, not confirmed as released or announced in the checked official sources. Their expected API labels are not official identifiers. The documented older tiers are gpt-5.6-terra and gpt-6-luna; their availability does not prove a 6.1 upgrade. We do not know whether or when Terra or Luna 6.1 will launch.
For developers who need an API now, compare GPT-6.1 Sol with the already released GPT-6 Astra, rather than waiting on an unconfirmed Astra 6.1 date. APIMaster's September 30, 2026 live snapshot, counting only routes with status=1, lists 4 active Sol 6.1 routes, from $0.089307 / $0.446535 per 1M input / output tokens, versus OpenAI's $2 / $10 standard price: up to ~95.5% off. Listed Sol 6.1 route prices range from $0.089307–$0.148688 input and $0.446535–$0.74344 output. Prices and availability change; the live marketplace card is authoritative, and the lowest input/output pair below comes from the same route.
| Model ID | Original price (input / output per 1M) | APIMaster current price | Active routes | Discount | Model card |
|---|---|---|---|---|---|
gpt-6.1-sol |
$2 / $10 | From $0.089307 / $0.446535 | 4 | Up to ~95.5% off | View discount |
gpt-6.1-astra (unconfirmed identifier) |
Not published | No public route | 0 | — | View model card |
gpt-6.1-terra (unconfirmed identifier) |
Not published | No public route | 0 | — | View model card |
gpt-6.1-luna (unconfirmed identifier) |
Not published | No public route | 0 | — | View model card |
gpt-6-sol |
$2 / $10 | From $0.089307 / $0.446535 | 8 | Up to ~95.5% off | View discount |
gpt-6-astra |
$10 / $50 | From $0.446535 / $2.232675 | 11 | Up to ~95.5% off | View discount |
gpt-6-luna |
$0.10 / $0.50 | From $0.00857485 / $0.04287427 | 6 | Up to ~91.4% off | View discount |
gpt-5.6-terra |
$2 / $12 | From $0.10706976 / $0.64241856 | 6 | Up to ~94.6% off | View discount |
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GPT-6.1 release date: which model actually launched?
The important distinction is the tier name, not just the version number. OpenAI's September 29 changelog and public model documentation establish a Sol 6.1 release. They do not establish a simultaneous Astra 6.1 launch. When a headline says “GPT-6.1 is out,” check whether it specifically means Sol.
| Model | Status as of September 30, 2026 | Public API identifier | What the date means |
|---|---|---|---|
| GPT-6.1 Sol | Released | gpt-6.1-sol |
September 29 is the documented launch date |
| GPT-6.1 Astra | Unreleased; planned launch reportedly paused | None confirmed | September 28–29 are report dates, not launch dates; the reported October window is not a current commitment |
| GPT-6.1 Terra | Unknown; no official release or announcement confirmed | None confirmed | No confirmed launch date |
| GPT-6.1 Luna | Unknown; no official release or announcement confirmed | None confirmed | No confirmed launch date |
| GPT-6 Astra | Existing released model | gpt-6-astra |
A separate generation from the unreleased Astra 6.1 |
That also means an available GPT-6 Astra route is not an Astra 6.1 route, and an existing gpt-6-sol integration does not automatically use Sol 6.1. Keep the exact identifier visible in configuration and billing records.
Why is GPT-6.1 Astra on hold?
September 28–29 reporting described OpenAI withholding a planned Astra 6.1 release after internal safety testing. Our Astra release-status article separates the reported safety concerns from verified public availability. “Planned release paused” is the editorial summary, not a claim that OpenAI has published a new date or permanently ended the project.
The practical conclusion is narrower than the headline: do not treat Astra 6.1 as a public product, assign it Sol's specifications, or invent a price. Further testing, changes to the model, a different name or a later release remain possible, but none supplies a usable deployment schedule today. Sol 6.1's release does not resolve that uncertainty.
What about GPT-6.1 Terra and GPT-6.1 Luna?
We do not know their release plans. On September 30, 2026, the checked OpenAI model availability page names GPT-6.1 Sol, GPT-6 Sol, GPT-6 Luna and the older GPT-5.6 tiers. Direct checks of the expected gpt-6.1-terra and gpt-6.1-luna documentation URLs returned 404, and both APIMaster model queries returned zero active routes. These are limited checks, not proof that no internal project exists. They do not justify calling either tier released, delayed, cancelled or scheduled for a specific date. The expected gpt-6-terra documentation URL also returned 404; do not invent a GPT-6 Terra tier to fill the gap.
The confirmed alternatives have different versions: GPT-5.6 Terra, with standard input/output pricing of $2 / $12 per 1M tokens, and GPT-6 Luna, at $0.10 / $0.50. OpenAI describes Luna as an efficient option for focused, repeatable tasks. Their Terra and Luna live cards are buying options for those exact older models, not placeholders for a 6.1 release. Neither price nor specification establishes a future Terra 6.1 or Luna 6.1 product.
What does GPT-6.1 Sol offer today?
OpenAI describes Sol 6.1 as delivering near-Astra performance for complex coding, computer use and professional work at lower cost. “Near-Astra” is a positioning claim and a reason to evaluate the model, not proof of identical results on every task; it is not a comparison against an available Astra 6.1 API.
The official Sol model page lists a 1,050,000-token context window, 128,000 maximum output tokens, text and image input, text output, and an April 30, 2026 knowledge cutoff. Reasoning supports low, medium (default), high, xhigh and max, not none or minimal. Parameters are not publicly disclosed. The context window is shared with output and other request content; it is not a separate guaranteed million-token input allowance.
Use the Sol API guide for detailed specifications, examples and caching rules. Nothing in those specifications should be copied into an Astra 6.1 product listing before Astra 6.1 has its own official documentation.
GPT-6.1 API pricing: Sol prices are public, Astra prices are not
At OpenAI's standard rates per 1M tokens, Sol 6.1 costs $2 input, $0.10 cached input, $10 output and $2.50 cache writes. The released GPT-6 Astra standard input/output rates are $10 / $50. Sol therefore has one-fifth the standard uncached input/output token price of the existing GPT-6 Astra, not of the unreleased GPT-6.1 Astra.
Do not turn this into a guaranteed fivefold reduction in task cost. Reasoning length, retries, tools, cache policy and route billing all affect the total. OpenAI's pricing documentation also applies higher long-context rates when input exceeds 272K tokens: input, cache reads and writes are 2×, output is 1.5×, for the entire request. Confirm your provider's terms rather than assuming every route uses identical billing rules.
For live purchasing, open the Sol 6.1 discount card and the released Astra discount card. The quick-answer snapshot is dated, not a fixed quote. A gpt-6.1-astra card or reseller label alone is not evidence of an official release.
How to use GPT-6.1 Sol in Work, Codex or an API
OpenAI's model availability page lists Sol 6.1 for ChatGPT Work and Codex on Plus, Pro, Business, Enterprise and Edu. Enterprise and Edu require administrator enablement. This is not a claim of ordinary Chat availability, and a ChatGPT subscription does not automatically include separately billed API usage. Check the selector and workspace policy on the surface you actually use.
For an API integration, use the exact gpt-6.1-sol identifier. OpenAI recommends Responses for tool calling; Chat Completions supports this model without tool calling. For APIMaster, first confirm the selected route's endpoint and client compatibility. Use our route-verification guide to distinguish model evidence from uptime and to check the route you intend to buy.
Sol 6.1 Ultrafast is described as forthcoming in the checked release documentation. Do not attach the published “up to 8×” Astra Ultrafast comparison to Sol 6.1 or use it as a promise about a future Astra 6.1 release.
Should you use Sol now or wait for Astra 6.1?
For a project that must ship now, evaluate Sol 6.1 and the released GPT-6 Astra on the same representative tasks. Compare accepted results, elapsed time and total billed tokens; inspect the changed files or other artifacts, not just the model's completion statement. Select the route and reasoning setting that meet your acceptance criteria.
Waiting makes sense only if your project can absorb an unknown timeline. Keep the model ID configurable and require a primary-source release announcement, official specifications and route-specific tests before a future switch. Do not prepay for an unreleased Astra 6.1 tier or interpret the reported pause as proof that the released Astra is unavailable.
Sources and update policy
- OpenAI Sol 6.1 model reference: public API identifier, capabilities and limits.
- OpenAI changelog: September 29, 2026 Sol release entry.
- OpenAI pricing and model availability: billing and product-surface distinctions.
- GPT-5.6 Terra and GPT-6 Luna: documented older tiers, not evidence of a 6.1 release.
- Astra reporting archive and source links: the September 28–29 reported pause; not a public Astra 6.1 specification.
- APIMaster live Sol route data: September 30, 2026 snapshot, filtered to active routes.
This overview distinguishes documented release facts from attributed reporting. If OpenAI publishes Astra 6.1 documentation or a revised launch date, its status must be rechecked before this page is updated. There is no combined “GPT-6.1” API alias established by the sources cited here.
FAQ
Has GPT-6.1 been released?
GPT-6.1 Sol has: it launched September 29, 2026. GPT-6.1 Astra has not been publicly released in the checked sources, and its planned launch is reportedly on hold. Always specify the tier.
Is GPT-6.1 Astra permanently cancelled?
That is not confirmed. A reported pause or cancellation of a planned window does not establish permanent cancellation, and no replacement date is confirmed here.
What GPT-6.1 model ID can I use today?
Use gpt-6.1-sol on a compatible route. gpt-6.1-astra is not a confirmed public identifier, and gpt-6-astra is the older, released Astra model.
Does Sol 6.1 cost one-fifth of Astra 6.1?
No such comparison is available. Sol's $2 / $10 standard input/output rates are one-fifth of the released GPT-6 Astra's $10 / $50 rates; Astra 6.1 pricing is not published.
Does the Astra pause affect Sol 6.1 access?
It does not establish that Sol was withdrawn. Sol has its own release documentation; access still depends on the product surface, account, workspace policy and API route.
Are GPT-6.1 Terra and GPT-6.1 Luna released?
Their release status and plans are unknown in the checked official sources. Neither has a confirmed public model page, API identifier, price or release date in this overview. Do not copy Astra's reported pause onto Terra or Luna.
Is GPT-6 Luna the same as GPT-6.1 Luna?
No. gpt-6-luna is a documented model, while a Luna 6.1 release is unconfirmed. Likewise, gpt-5.6-terra is not GPT-6.1 Terra. Keep the full version in every comparison.
How do I get a discounted Sol 6.1 API key?
Check the live Sol card, register with APIMaster, then create an API key. Configure the base URL as https://apimaster.ai/v1 and model as gpt-6.1-sol, verify endpoint compatibility and test a small workload before scaling. The September 30 snapshot offers up to ~95.5% off standard input/output pricing; the live card governs the actual price.