GPT-5
OpenAI's flagship unified model that routes between fast answers and deep reasoning
About
GPT-5 is OpenAI's flagship model family, released August 7, 2025. It replaces the old split between GPT and o-series reasoning models with a single system: an intelligent router decides per query whether to answer directly, think briefly, or reason at length, and exposes a reasoning-effort control to developers. The family ships in Standard, Mini, and Nano sizes plus a Pro tier for the hardest tasks. It is multimodal with a large context window and full tool use, and it became the default model in ChatGPT on launch. Early reception was mixed: users liked the speed and lower hallucinations but some missed GPT-4o's tone, which OpenAI partially restored by bringing 4o back as an option. Pricing undercuts the old o3 tier substantially, which made it the economical frontier default for many teams.
Specs
Context window
Pricing
Free quota
API access
Weights
Released
Benchmarks
Team-reported via third-party trackers: GPQA Diamond 85.4%
Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.
Use cases
Trust score — 9/10
Scored 9/10 (verified tier, metrics-v1). Evidence: Aug 7, 2025 release, 400K context, $1.25/$10 pricing corroborated across 3 sources; Router + reasoning-effort design verified; GPQA Diamond 85.4% labeled team-reported via third-party trackers; Mixed reception and GPT-4o restoration noted honestly.