GPT‑6 Luna is the free variant of OpenAI's GPT‑6, rolling out in ChatGPT with a new Intelligent UI that presents interactive visuals and mini‑apps alongside text and aims to deliver faster responses.
CURRENT SNAPSHOT4/5 DIMENSIONS WITH DATA
The dimensions that change the decision.
PRICING
Free/budget variantPaying customers receive GPT‑6 Sol, while free users receive GPT‑6 Luna; media outlets refer to GPT‑6 Luna as OpenAI's budget/free variant.
Price change versus previous generationReportedly priced at about half the token price of the GPT-5.6 Sol and Luna models (≈50% reduction reported).
CONTEXT WINDOW
Not established from the available sources.
MODALITIES
Interactive visuals and UI elementsGPT‑6 can present answers as interactive interfaces that combine text with diagrams, charts, forms, tappable buttons, graphics, and small built‑in tools (mini apps).
BENCHMARKS
Reported benchmark/performance change versus predecessorOne report states Luna 'improves on its predecessor by 5.4 percentage points while costing 58 percent less' on the evaluations referenced by that coverage; the excerpt does not name the specific benchmark.
Internal benchmark vs GPT‑5.6In internal tests using the streaming method, GPT‑6 scored higher than its predecessor GPT‑5.6 on difficult web searches.
AVAILABILITY
Rollout scheduleRollout began globally for Plus, Pro, Business, and Enterprise users; Free and Go users follow one day later.
Availability in ChatGPT clientsAt launch, Luna is reported to be available in the ChatGPT desktop app and to Free and Go users; broader ChatGPT availability was described as rolling out gradually.
OTHER · Primary intended tasks (examples)DEVELOPER CLAIM
Described as suited to clerical, high-volume tasks with clear goals — e.g., summarizing documents, extracting information, and answering quick questions.
OTHER · Role in high-volume workloadsDEVELOPER CLAIM
Positioned to make focused, repeatable tasks practical at high volume, where small differences in latency and cost multiply across requests.
AVAILABILITY · Rollout scheduleDEVELOPER CLAIM
Rollout began globally for Plus, Pro, Business, and Enterprise users; Free and Go users follow one day later.
AVAILABILITY · Availability in ChatGPT clientsDEVELOPER CLAIM
At launch, Luna is reported to be available in the ChatGPT desktop app and to Free and Go users; broader ChatGPT availability was described as rolling out gradually.
OTHER · API identifierDEVELOPER CLAIM
Provided in the API under the name gpt-6-luna.
PRICING · Free/budget variantDEVELOPER CLAIM
Paying customers receive GPT‑6 Sol, while free users receive GPT‑6 Luna; media outlets refer to GPT‑6 Luna as OpenAI's budget/free variant.
PRICING · Price change versus previous generationDEVELOPER CLAIM
Reportedly priced at about half the token price of the GPT-5.6 Sol and Luna models (≈50% reduction reported).
Positioned for high-volume, well-defined, repeatable tasks — examples given include summarizing documents, extracting information, and answering short questions. Coverage describes Luna as making focused, repeatable tasks practical at high volume where small differences in latency and cost matter.
MODALITIES · Interactive visuals and UI elementsDEVELOPER CLAIM
GPT‑6 can present answers as interactive interfaces that combine text with diagrams, charts, forms, tappable buttons, graphics, and small built‑in tools (mini apps).
BENCHMARKS · Reported benchmark/performance change versus predecessorDEVELOPER CLAIM
One report states Luna 'improves on its predecessor by 5.4 percentage points while costing 58 percent less' on the evaluations referenced by that coverage; the excerpt does not name the specific benchmark.
CAPABILITIES · Used as foundation for Decisions APIDEVELOPER CLAIM
Reportedly the Decisions API is built on GPT-6 Luna for fast, single decisions and classification tasks (i.e., Luna is used as the model for that API).
LIMITATIONS · Performance note / limitation reported by coverageDEVELOPER CLAIM
Some coverage characterizes Sol and Luna as largely matching their predecessors' performance while delivering significant price reductions (phrases used include 'barely move the needle on performance'), indicating that the primary change in these releases was cost efficiency rather than large capability gains.
RELEASE · Rollout with Intelligent UIDEVELOPER CLAIM
GPT‑6 is rolling out globally in ChatGPT with a new Intelligent UI that provides visuals and interactive experiences.
CAPABILITIES · Streaming response while 'thinking' and speed claimDEVELOPER CLAIM
GPT‑6 can produce responses while still 'thinking' (streaming), which OpenAI says reduces wait times by 44 percent in some cases.
BENCHMARKS · Internal benchmark vs GPT‑5.6DEVELOPER CLAIM
In internal tests using the streaming method, GPT‑6 scored higher than its predecessor GPT‑5.6 on difficult web searches.
WHAT CHANGED
Stored passport versions, without reconstructed history.
Passport updated16 facts
AVAILABILITY · Availability and distribution channels− Reportedly available on Amazon Bedrock (generally available). Also offered in ChatGPT Work and Codex for paid accounts; Luna is available in the ChatGPT desktop app and for Free and Go users; offered via the API as gpt-6-luna, with rollout in the ChatGPT app described as gradual.
RELEASE · Rollout with Intelligent UI+ GPT‑6 is rolling out globally in ChatGPT with a new Intelligent UI that provides visuals and interactive experiences.
MODALITIES · Interactive visuals and UI elements+ GPT‑6 can present answers as interactive interfaces that combine text with diagrams, charts, forms, tappable buttons, graphics, and small built‑in tools (mini apps).
BENCHMARKS · Internal benchmark vs GPT‑5.6+ In internal tests using the streaming method, GPT‑6 scored higher than its predecessor GPT‑5.6 on difficult web searches.
PRICING · Free/budget variant+ Paying customers receive GPT‑6 Sol, while free users receive GPT‑6 Luna; media outlets refer to GPT‑6 Luna as OpenAI's budget/free variant.
AVAILABILITY · Rollout schedule+ Rollout began globally for Plus, Pro, Business, and Enterprise users; Free and Go users follow one day later.
CAPABILITIES · Streaming response while 'thinking' and speed claim+ GPT‑6 can produce responses while still 'thinking' (streaming), which OpenAI says reduces wait times by 44 percent in some cases.
PRICING · Pricing and cost relative to predecessor− Announced at roughly half the token price of the GPT-5.6 Sol/Luna predecessors. Reporting gives Luna's list prices as $0.10 per million input tokens and $0.50 per million output tokens. OpenAI attributes lower API prices to caching and inference improvements; articles also report a broader 50% price cut vs the 5.6 series and additional prompt-caching discounts for GPT-6.
MODALITIES · Supported modalities / runtime usage− Reportedly used to run ChatGPT Voice: OpenAI's voice feature runs on GPT-6 Astra, Sol, and Luna and can access plugins like email, calendar, and Slack (i.e., Luna is used for voice interactions in ChatGPT's feature set).
Passport updated13 facts
AVAILABILITY · Availability on Amazon Bedrock− Reportedly generally available on Amazon Bedrock.
RELEASE · Release / announcement dateIntroduced alongside GPT-6 Sol as part of the GPT-6 family on 2026-09-22.→Announced/launched on September 22, 2026.
OTHER · API identifierProvided in the API under the name gpt-6-luna.→Provided in the API under the name gpt-6-luna.
AVAILABILITY · Availability in ChatGPT clientsAt launch, Luna is reported to be available in the ChatGPT desktop app and to Free and Go users; broader ChatGPT availability was described as rolling out gradually.→At launch, Luna is reported to be available in the ChatGPT desktop app and to Free and Go users; broader ChatGPT availability was described as rolling out gradually.
CAPABILITIES · Used as foundation for Decisions API+ Reportedly the Decisions API is built on GPT-6 Luna for fast, single decisions and classification tasks (i.e., Luna is used as the model for that API).
AVAILABILITY · Availability and distribution channels+ Reportedly available on Amazon Bedrock (generally available). Also offered in ChatGPT Work and Codex for paid accounts; Luna is available in the ChatGPT desktop app and for Free and Go users; offered via the API as gpt-6-luna, with rollout in the ChatGPT app described as gradual.
OTHER · Role in high-volume workloadsPositioned to make focused, repeatable tasks practical at high volume, where small differences in latency and cost multiply across requests.→Positioned to make focused, repeatable tasks practical at high volume, where small differences in latency and cost multiply across requests.
CAPABILITIES · Intended use-cases / capabilities+ Positioned for high-volume, well-defined, repeatable tasks — examples given include summarizing documents, extracting information, and answering short questions. Coverage describes Luna as making focused, repeatable tasks practical at high volume where small differences in latency and cost matter.
PRICING · Published token pricing (reported)− Reported pricing: $0.10 per million input tokens and $0.50 per million output tokens for GPT-6 Luna.
LIMITATIONS · Performance note / limitation reported by coverage+ Some coverage characterizes Sol and Luna as largely matching their predecessors' performance while delivering significant price reductions (phrases used include 'barely move the needle on performance'), indicating that the primary change in these releases was cost efficiency rather than large capability gains.
PRICING · Price change versus previous generationReportedly priced at about half the token price of the GPT-5.6 Sol and Luna models (≈50% reduction reported).→Reportedly priced at about half the token price of the GPT-5.6 Sol and Luna models (≈50% reduction reported).
BENCHMARKS · Reported benchmark/performance change versus predecessor+ One report states Luna 'improves on its predecessor by 5.4 percentage points while costing 58 percent less' on the evaluations referenced by that coverage; the excerpt does not name the specific benchmark.
OTHER · Primary intended tasks (examples)Described as suited to clerical, high-volume tasks with clear goals — e.g., summarizing documents, extracting information, and answering quick questions.→Described as suited to clerical, high-volume tasks with clear goals — e.g., summarizing documents, extracting information, and answering quick questions.
PRICING · Pricing and cost relative to predecessor+ Announced at roughly half the token price of the GPT-5.6 Sol/Luna predecessors. Reporting gives Luna's list prices as $0.10 per million input tokens and $0.50 per million output tokens. OpenAI attributes lower API prices to caching and inference improvements; articles also report a broader 50% price cut vs the 5.6 series and additional prompt-caching discounts for GPT-6.
MODALITIES · Supported modalities / runtime usage+ Reportedly used to run ChatGPT Voice: OpenAI's voice feature runs on GPT-6 Astra, Sol, and Luna and can access plugins like email, calendar, and Slack (i.e., Luna is used for voice interactions in ChatGPT's feature set).
Passport created8 facts
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