GPT

Overview

This is a model family overview. For version-specific details, see the individual model entries linked below.

GPT is OpenAI’s core model family for assistant, reasoning, coding, and multimodal workloads. The lineup is still broad, but the cleanest current framing is this: OpenAI has a newest frontier lane across ChatGPT, Codex, and API surfaces, smaller efficiency tiers, specialized Codex-tuned routes, and domain-specific research lanes. In practice, most teams use GPT through routing rather than one permanent default model.

Current Lineup

At this snapshot date, the current GPT picture looks like this:

• Newest frontier general-purpose lane: GPT-5.5 is available across eligible ChatGPT, Codex, and API workflows for difficult professional work, tool use, computer use, and long-context reasoning.
• Premium escalation lane: GPT-5.5 Pro is the compute-heavier premium route for the hardest analysis and coding work, now also listed as an API model.
• Still-current API lanes: GPT-5.4, GPT-5.4-Pro, GPT-5.2, and GPT-5.2-Pro remain important API models for compatibility, cost routing, and teams already standardized on them.
• Codex-specialized routes: GPT-5.2-Codex and GPT-5.3-Codex are still published specialized coding models, but the exact model used inside Codex clients depends on the surface and configuration.
• Specialized scientific-research lane: GPT-Rosalind is a separate life-sciences research preview for qualified enterprise teams using ChatGPT Enterprise, Codex, and the API.
• Efficiency tiers: GPT-5.4 mini, GPT-5.4 nano, GPT-5 mini, and GPT-5 nano cover faster or cheaper workloads depending on the product surface.
• Compatibility / historical routes: GPT-4o, GPT-4.1, GPT-5, and earlier Codex variants now matter mostly for migration, compatibility, or historical comparison.

Strengths

• Strong general-purpose quality across reasoning, coding, multimodal workflows, and tool use.
• Mature API, playground, eval, and agent tooling ecosystem for production integration.
• Broad tiering for cost-quality routing strategies.
• Large context support in flagship tiers for long-document and agent workflows.
• Frequent model iteration with explicit migration paths between generations.

Tier Guide

• GPT-5.5 / GPT-5.5 Pro: newest frontier tier for difficult reasoning, coding, computer use, and longer agent workflows across ChatGPT, Codex, and API surfaces.
• GPT-5.4 / GPT-5.4 Pro: still-relevant premium routes for compatibility, cost routing, or existing production integrations.
• GPT-5.2 / GPT-5.2-Pro: strong current API defaults when you want broad capability without always paying frontier premiums.
• GPT-5.2-Codex / GPT-5.3-Codex: coding-specialized routes for repository and agent workflows, but not a guarantee of Codex client defaults.
• GPT-Rosalind: domain-specific research preview for biology and life-sciences workflows, not a mainstream replacement for general GPT routing.
• GPT-5.4 mini or nano and GPT-5 mini or nano: cost-efficient options for high-volume or supporting work.
• o-series: separate reasoning-specialized family for targeted deep-analysis routes.

Access

• OpenAI API
• ChatGPT and Codex first-party product surfaces
• Partner platforms exposing OpenAI model endpoints