GPT-6 Luna.
GPT-6 Luna is OpenAI's model for focused, high-volume tasks, with text and image input, a 1.05M-token context and reasoning effort from none to max.
No self-host path — closed weights.
GPT-6 Luna's weights aren't published. Use it via the access providers below.
Cheapest hosted endpoints.
Variants in the GPT family.
GPT-5
OpenAI's frontier multimodal reasoning model.
GPT-4 Turbo
OpenAI's pre-GPT-5 flagship — still extensively deployed.
GPT-4o
OpenAI's multimodal model — text, vision, audio in one.
GPT-4o Mini
Cheap multimodal default — replaced GPT-3.5 Turbo for low-cost workloads.
GPT-5.6 Luna
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It i...
GPT-5.6 Sol
GPT-5.6 Sol is OpenAI's GPT-5.6 flagship for complex professional work, with ...
GPT-5.6 Terra
GPT-5.6 Terra balances intelligence and cost, near OpenAI's old mini tier, wi...
GPT-6.1 Sol
GPT-6.1 Sol is OpenAI's text and image model for complex coding, computer use...
GPT-6.1 Terra
GPT-6.1 Terra is OpenAI's fast model for visual reasoning, computer use and w...
GPT-6 Astra
GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is s...
GPT-6 Sol
GPT-6 Sol is OpenAI's model for complex coding and agent workflows, with text...
GPT-3.5 Turbo
GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natur...
GPT-3.5 Turbo (older v0613)
GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natur...
GPT-3.5 Turbo Instruct
This model is a variant of GPT-3.5 Turbo tuned for instructional prompts and ...
GPT-4
OpenAI's flagship model, GPT-4 is a large-scale multimodal language model cap...
GPT-4 (older v0314)
GPT-4-0314 is the first version of GPT-4 released, with a context length of 8...
GPT-4 Turbo (older v1106)
The latest GPT-4 Turbo model with vision capabilities. Vision requests can no...
GPT-4.1
GPT-4.1 is a flagship large language model optimized for advanced instruction...
GPT-4.1 Mini
GPT-4.1 Mini is OpenAI's deprecated low-latency model for instructions and to...
GPT-4.1 Nano
For tasks that demand low latency, GPT‑4.1 nano is the fastest and cheapest m...
GPT-4o (2024-05-13)
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and...
GPT-4o (2024-08-06)
The 2024-08-06 version of GPT-4o offers improved performance in structured ou...
GPT-4o (2024-11-20)
A pinned November 2024 snapshot of OpenAI's GPT-4o with text and image input ...
GPT-4o-mini (2024-07-18)
GPT-4o mini (2024-07-18) is a deprecated snapshot of OpenAI's small model for...
GPT-5 Chat
GPT-5 Chat is designed for advanced, natural, multimodal, and context-aware c...
GPT-5 Codex
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineer...
GPT-5 Mini
GPT-5 Mini is OpenAI's deprecated smaller GPT-5, with text and image input an...
GPT-5 Nano
GPT-5 Nano is OpenAI's deprecated fastest GPT-5 version, with text and image ...
GPT-5 Pro
GPT-5 Pro uses more compute for hard problems, runs only in the Responses API...
GPT-5.1
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stro...
GPT-5.1 Chat
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, ...
GPT-5.1-Codex
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engi...
GPT-5.1-Codex-Max
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-...
GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
GPT-5.2
GPT-5.2 is the latest frontier-grade model in the GPT-5 series, offering stro...
GPT-5.2 Chat
GPT-5.2 Chat is the deprecated GPT-5.2 snapshot used in ChatGPT, with text an...
GPT-5.2 Pro
GPT-5.2 Pro is OpenAI's previous pro model, Responses API only, with text and...
GPT-5.2-Codex
GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software ...
GPT-5.3 Chat
GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday co...
GPT-5.3-Codex
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the f...
GPT-5.4
GPT-5.4 is an OpenAI model for complex professional work, with text and image...
GPT-5.4 Mini
GPT-5.4 Mini is OpenAI's high-volume model for coding, computer use and sub-a...
GPT-5.4 Nano
GPT-5.4 nano is OpenAI's deprecated model for high-volume classification, ext...
GPT-5.4 Pro
GPT-5.4 Pro uses more compute than GPT-5.4 for hard problems, runs only in th...
GPT-5.5
GPT-5.5 is OpenAI's model for coding and complex professional work, with text...
GPT-5.5 Pro
GPT-5.5 Pro is OpenAI's higher-compute GPT-5.5, with text and image input and...
GPT-4 Turbo Preview
The preview GPT-4 model with improved instruction following, JSON mode, repro...
GPT-4o Search Preview
GPT-4o Search Previewis a specialized model for web search in Chat Completion...
GPT-4o-mini Search Preview
GPT-4o mini Search Preview is a specialized model for web search in Chat Comp...
What it costs per month across providers.
Estimate your monthly bill for GPT-6 Luna across every host that publishes per-token pricing. Slide your token volumes; the chart + table re-rank cheapest-first.
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About GPT-6 Luna.
GPT-6 Luna is the model OpenAI describes as its most efficient, intended for focused, high-volume tasks. It takes text and images and returns text, with no audio or video support. The context window is 1,050,000 tokens, output reaches 128,000 and knowledge stops at May 18, 2026. Reasoning effort runs from none to max, with medium as the default. In Chat Completions, function calling works only with reasoning set to none.