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OpenAI

GPT-5 Nano

CClosed

OpenAI's smallest and cheapest model at $0.05/$0.40 per million tokens with a 400K-token context — the lowest input price in the OpenAI lineup and roughly 40x cheaper than GPT-5.4 Mini on input.

API Pricing

Input

$0.05

Output

$0.4

Cached input

—

Peak hours

—

USD / 1M tokens

※ OpenRouter measured (2026-10): input $0.05 / output $0.40 (USD per million tokens), OpenAI's lowest input price tier

Price sourceopenrouter.ai ↗developers.openai.com ↗

No price change in the last two snapshots

Price history

7 snapshots · 2026-07-25 → 2026-08-17

Current: $25Period low: $25 (2026-07-25)Period high: $25 (2026-07-25)First tracked: $25 (2026-07-25)

Specifications

Context window
400,000 Tokens
Max output
128K Tokens
License
Closed

Overall score

Total

40.5

Rank

#26

Tier

C

Data confidence

70%

Capability25
Scale35
Value88
Context44.1
Ecosystem21
Freshness35

Capabilities & use cases

Best for

  • Ultra-large-scale classification and tagging
  • Real-time low-latency rewriting
  • Low-cost Agent routing front-end
  • Offline batch processing

Official links

Website ↗API platform ↗Pricing page ↗Open in comparator ↗

Same vendor

GPT-6.1 SolGPT-6 AstraGPT-5.6 LunaGPT-5.6 SolGPT-6 LunaGPT-5.6 Terra

Similar price

Qwen3.8-Flash (Tongyi) $0.47ERNIE 4.5 Turbo ¥3.2GLM-5.3-Flash $0.5Claude Haiku 5.5 $0.5MiMo-V2.6-Flash $0.28DeepSeek-V4.1-Flash $0.6

FAQ

What does GPT-5 Nano cost?
GPT-5 Nano is priced at $0.4 output and $0.05 input (USD per 1M tokens)
How large is the context window of GPT-5 Nano?
GPT-5 Nano has a 400,000 Tokens context window with up to 128K Tokens output.
Where can I access GPT-5 Nano?
Official channels: Website and API platform.

Data is refreshed daily and cross-checked against two independent sources; please confirm pricing and specs on the vendor page.