GPT-5 Nano by OpenAI — Specs, Pricing & Capabilities | whichllm

Model ID gpt-5-nano

Provider OpenAI

Family gpt-nano

Status -

Knowledge Cutoff 2024-05-30

Release Date 2025-08-07

Input Modalities text, image

Output Modalities text

Context Window 400000

Input Limit 272000

Output Limit 128000

Tool Calling Yes

Reasoning Yes

Structured Output Yes

Temperature Control No

Open Weights No

Input Cost / 1M tokens $0.05

Output Cost / 1M tokens $0.40

Reasoning Cost / 1M tokens -

Cache Read Cost / 1M tokens $0.01

Cache Write Cost / 1M tokens -