GPT 5 Nano

Optimized for speed and ideal for applications requiring low latency. The fastest and most efficient GPT-5 variant.

Reasoning
Vision

Added Aug 7, 2025

Pricing

Auto routing · per 1M tokens

Input: $0.050
Output: $0.40
Cache read: $0.0050

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Specifications

Context window: 400K
Max output: 128K
Avg output (7d): 326 tokens; Longer than 29% of models

Benchmarks

Artificial Analysis

LMArena

Vectara

Design Arena

Sourced from Artificial Analysis.

Intelligence Index

13.0

Better than 50% of models compared

Agentic work

T²-Bench Telecom (legacy)

Legacy fallback · Conversational AI agents in dual-control scenarios

36.5%

Better than 44% of models compared

Document reasoning

AA-LCR v1.1

Long context reasoning with updated grading

45.0%

Better than 40% of models compared

Reasoning

HLE

Humanity's Last Exam

9.5%

Better than 49% of models compared

IFBench

Instruction-following benchmark

67.6%

Better than 81% of models compared

Coding

Terminal-Bench Hard (legacy)

Legacy fallback · Agentic coding and terminal use

12.1%

Better than 48% of models compared

LiveCodeBench

Contamination-free coding benchmark

78.9%

Better than 91% of models compared

Math

AIME 2025

American Invitational Mathematics Examination 2025

83.7%

Better than 80% of models compared

Knowledge

MMLU-Pro

Professional and academic subject knowledge

78.0%

Better than 59% of models compared

Legacy benchmarks

GPQA Diamond (legacy)

Graduate-level scientific reasoning

67.6%

Better than 44% of models compared

AA-LCR (unversioned / legacy)

Long context reasoning evaluation