OpenAI

Compare the 17 models in OpenAI — independently verified, re-verified on a rolling schedule, graded on capability, pricing and compliance.

What is in OpenAI

HokAI tracks 17 active tools in OpenAI. 4 of them (24%) publish a free tier you can test before paying.

OpenAI — Models

  • ChatGPT Images 2.5 — OpenAI's ChatGPT Images 2.5, released September 8, 2026, adds Sketch reference drawing and comment-based edits across two API snapshots, Flare and Sunburst.
  • GPT Image 2 — OpenAI's April 2026 image flagship integrates O-series reasoning for 99% text accuracy, natural language inpainting, and 2K resolution via a token-based API.
  • GPT-4o — GPT-4o is OpenAI's 2024 multimodal model with 90.2% HumanEval scoring and real-time voice, now deprecated in favor of newer OpenAI and rival models.
  • GPT-4o mini — OpenAI's smallest 2024-era multimodal model, built for high-volume, low-cost vision and tool-calling workloads rather than frontier reasoning.
  • GPT-5 — OpenAI's GPT-5 is a Mixture-of-Experts flagship model that scored 74.9% SWE-bench Verified at launch, with a 272K-token context window.
  • GPT-5.2 — OpenAI's fourth GPT-5 variant: 400,000-token context, 80% SWE-bench Verified, 92.4% GPQA Diamond. Released December 2025, deprecated June 2026.
  • GPT-5.4 — GPT-5.4 (OpenAI, March 2026) is a flagship reasoning and coding model with a 1M-token context window and a native Computer Use API.
  • GPT-5.5 — GPT-5.5 is OpenAI's April 2026 flagship model for agentic coding and knowledge work, with a 1.05M-token API context window and text and image input.
  • GPT-5.5 Pro — GPT-5.5 Pro is OpenAI's April 2026 top-tier reasoning mode, 1M-token context, 88.7% SWE-bench Verified, priced at $30/$180 per 1M tokens.
  • GPT-5.6 Luna — GPT-5.6 Luna by OpenAI (July 2026): budget-tier pricing, fastest in family, high-volume workloads. 200K context, vision plus text, capped reasoning.
  • GPT-5.6 Sol — GPT-5.6 Sol by OpenAI (July 2026): flagship-tier pricing, 2x token efficiency vs peers, ultra multi-agent coordination, programmatic tool calling. Microsoft 365 Copilot preferred model.
  • GPT-5.6 Terra — GPT-5.6 Terra is OpenAI's balanced-tier model, released July 2026 with strong reasoning, a 200K context window, and no ultra mode.
  • GPT-5.6-Cyber — OpenAI's gated cybersecurity fine-tune of GPT-5.6 Sol, released August 2026 for vetted Daybreak Red partners doing authorized exploit development and vulnerability research.
  • GPT-6 Astra — OpenAI's flagship model, launched September 2026 as the first ever rated at the Preparedness Framework's Critical cybersecurity level.
  • GPT-6 Luna — GPT-6 Luna (Sept 2026) is OpenAI's lowest-cost GPT-6 model, tuned for high-volume chat, extraction and classification with six adjustable reasoning-effort levels.
  • GPT-6 Sol — OpenAI's mid-tier GPT-6 model (Sep 2026), 1.05M-token context, 68.8% on DeepSWE v1.1 coding, half GPT-5.6 Sol's price.
  • GPT-6.1 Sol — GPT-6.1 Sol is OpenAI's September 2026 mid-tier reasoning model for coding, computer use and document work, built to sit just below GPT-6 Astra.

Frequently asked questions

How many models are there in OpenAI?

HokAI currently lists 17 active entries in OpenAI. Each is verified against the vendor's own pages and re-checked as those pages change, so the count moves as the category does.

Which models are listed under OpenAI?

ChatGPT Images 2.5, GPT Image 2, GPT-4o, GPT-4o mini and GPT-5, among the 17 entries in this section. Each links through to a full profile covering what it does, how it is priced where that is published, and how it compares with the alternatives in the same category.

Are there free OpenAI options?

Yes — 4 of the 17 listings in OpenAI publish a free tier. Free tiers here usually cap usage volume or hold back the higher-end features rather than expiring, so they suit evaluation before committing.