GPT-5 Nano

ModelActive

by OpenAI · family “gpt-nano”

GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger... (description from the OpenRouter listing)

in: textin: imagein: fileout: textReasoningTool useStructured output

Epoch Capabilities Index

139.4 #116 of 268

90% CI 134.5 – 141.4

Listing ↗

Released

7 Aug 2025

Context window

400K tokens

Max output

128K tokens

Input $ / 1M tokens

$0.050

Output $ / 1M tokens

$0.40

Cached input $ / 1M

$0.005

Each benchmark shown separately with its own source

Benchmark results (17)

All benchmarks

Benchmark	Domain	Score	vs best recorded	Setting	Run	Source
LMCA	agents	7.9%	12%	high	—	External ↗
DTBench	reasoning	62.7%	64%	high	—	External ↗
Mystery Game Puzzles	games	8.0% ±2.7	10%	high	27 Aug 2026	Epoch ↗
FrontierMath-Tiers-1-3-v2-Private	math	20.0% ±2.4	21%	high	12 Jun 2026	Eval log ↗
FrontierMath-Tier-4-v2-Private	math	2.4% ±2.4	2%	high	12 Jun 2026	Eval log ↗
ProofBench	math	12.0%	12%	high	—	External ↗
Chess Puzzles	games	27.0% ±4.5	38%	high	7 Aug 2026	Eval log ↗
SimpleQA Verified	knowledge	11.7% ±1.0	15%	high	10 Aug 2026	Epoch ↗
FrontierMath-Tier-4-2025-07-01-Privatesuperseded	math	0.0%	0%	high	30 Oct 2025	Epoch ↗
ARC-AGI-2	reasoning	2.6%	3%	high	—	External ↗
FrontierMath-2025-02-28-Privatesuperseded	math	8.3% ±1.6	16%	high	30 Oct 2025	Epoch ↗
VPCT	multimodal	37.2%	41%	high	—	External ↗
WeirdML	coding	38.1% ±0.0	41%	high	—	External ↗
OTIS Mock AIME 2024-2025	math	81.1% ±4.6	81%	high	31 Oct 2025	Eval log ↗
GPQA diamond	science	69.4% ±2.8	73%	high	30 Oct 2025	Eval log ↗
MATH level 5	math	94.9% ±0.5	97%	high	20 Aug 2025	Epoch ↗
ARC-AGI	reasoning	16.7%	17%	high	—	External ↗

Source: Epoch AI Benchmarking Hub (CC BY 4.0). “External” rows are leaderboard results Epoch collects from third parties. Best reported setting per benchmark is shown.

API list price over time

Price history

$ per 1M tokens

13 observations (OpenRouter listing + Internet Archive snapshots). History accumulates with every ingest run; a single point means no change has been observed yet.