OpenAI Models

Overview of OpenAI’s latest models with positioning, multimodal capabilities, and practical guidance.

Latest: GPT‑6 Astra

GPT‑6 Astra (Sep 2026) is OpenAI's frontier model, with major gains in agentic computer/browser use, software engineering, and long multistep task execution. It is the first OpenAI model to reach the "Critical" cybersecurity capability threshold under OpenAI's Preparedness Framework.

Strengths

  • Agentic computer/browser use
  • Software engineering on real codebases
  • Long-horizon, multistep tasks

Best For

  • Enterprise coding agents
  • Automation with tools
  • Cybersecurity (trusted customers)

Model Lineup

GPT‑6 Astra

Latest frontier tier for agentic and coding work; rolling out via ChatGPT and the API.

GPT‑5.6 Sol / Terra / Luna

Previous-generation suite still available via the API for general-purpose reasoning and coding.

GPT‑5

2025 flagship generation; common baseline for cost/performance comparisons.

Practical Guidance

  • Use function schemas and strict JSON mode for deterministic tool calls.
  • For long-running agentic/computer-use tasks, prefer GPT‑6 Astra and monitor tool-call trajectories.
  • Set token caps, retries, and fallbacks for long workflows.