OpenAI GPT-5.6 Luna (gpt-5.6-luna) is a low-cost high-volume model with a 1.05M context window, priced at $0.20 input and $1.20 output per 1M tokens.

OpenAI GPT-5.6 Terra: balanced daily driver in the 5.6 family, 400k context, $2.50/$15 per 1M tokens.

OpenAI frontier flagship GPT-5.6 Sol: 1.05M context, effort up to max plus ultra, $5/$30 per 1M tokens.

OpenAI GPT-6 Luna: the cheapest GPT-6 tier at $0.10/$0.50 per 1M tokens with a 1.05M context window and max-effort reasoning.

OpenAI GPT-6 Sol: 1.05M context, reasoning up to max effort and $2/$10 per 1M tokens, with day-one GitHub Copilot support.

OpenAI's previous frontier model: 400k context, 128k max out, $1.75/$14 per 1M tokens. Docs now recommend GPT-5.6 Sol.

OpenAI's official Python and TypeScript agent runtime: agents, handoffs, guardrails, sessions, and tracing.

San Francisco lab behind ChatGPT and the GPT API. Current flagship is GPT-5.6 Sol; GPT-5.2 remains the previous frontier snapshot.

OpenAI's paid ChatGPT plan for priority access to current GPT models, image tools, and product updates in the official chat client.

OpenAI top ChatGPT seat. Not unlimited o1-mini / GPT-4o; not the API.

OpenAI text-embedding-3-small is an embedding model with 1536 default dimensions, an 8192-token input limit and a price of $0.02 per 1M tokens.

DALL-E 2 (dall-e-2) was OpenAI's text-to-image model with inpainting; OpenAI's model page says it was deprecated and removed from the API.

Hosted OpenAI whisper-1 snapshot. Not the 2026 default STT path.

omni-moderation-latest is OpenAI's free moderation model: it classifies text and images into 13 categories through the /v1/moderations endpoint.

Hosted OpenAI tts-1 snapshot. Not the 2026 default TTS path.

OpenAI tts-1-hd is a text-to-speech model optimized for quality, priced at $30 per 1M characters; OpenAI's model page lists it as deprecated.

OpenRouter is a unified API over many LLM providers, offering one key with routing and failover, a free model tier, and a bring-your-own-key option.

text-moderation-latest was OpenAI's text-only moderation model alias; it was shut down on October 27, 2025 and replaced by the omni-moderation models.

Deprecated OpenAI image model from November 2023. Removed from the API; OpenAI now points new work to GPT Image 2.

Previous OpenAI embedding snapshot. Not the 2026 embedding default.

Whisper large-v3 is OpenAI's open-weight speech recognition and translation model, with 99 languages, 128 Mel bins and 10 to 20% fewer errors than large-v2.