OpenAI · Released Aug 7, 2025GPT-5 Nano
Tiny GPT-5 lane for routing, extraction, classification, and bulk jobs.
- Capability
- 139.4ECI · #102 of 148
- Input
- $0.05per 1M tokens
- Output
- $0.40per 1M tokens
- Context
- 400K128K max output
What it costs
- Input
- $0.05per million tokens
- Output
- $0.40per million tokens
- Cached input
- $0.005per million tokens
- Blended (3:1)
- $0.138cheaper than 87% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $0.30 |
| Team assistant25M input + 5M output tokens | $3.25 |
| Production app250M input + 50M output tokens | $32.50 |
Official OpenAI API price, as listed on models.dev.
Independent benchmarks
#102 of 148 scored models
The shaded band is Epoch AI’s confidence range (134.9–141.7); the tick marks the median scored model.
Scores from Epoch AI, run independently of OpenAI.
The details
- Lab
- OpenAI
- Released
- Aug 7, 2025
- Knowledge cutoff
- May 30, 2024
- Context window
- 400,000 tokens
- Max output
- 128,000 tokens
- Inputs
- Text, Images
- Output
- Text
- Reasoning
- Adjustable effort minimal · low · medium · high
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
gpt-5-nanoon OpenAI- Availability
- 21 API providerslisted on models.dev
More from OpenAI
About GPT-5 Nano
How much does GPT-5 Nano cost?
GPT-5 Nano costs $0.05 input / $0.40 output per million tokens (official OpenAI API price). Cached input is $0.005 per million tokens. At a 3:1 input-to-output mix that is $0.138 per million tokens, cheaper than 87% of the 360 priced models we track.
What is the context window of GPT-5 Nano?
GPT-5 Nano accepts up to 400,000 tokens per request and can write up to 128,000 tokens in one response.
How good is GPT-5 Nano?
Epoch AI gives GPT-5 Nano a Capabilities Index score of 139.4 (likely range 134.9–141.7), ranking it #102 of 148 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 69.4%, FrontierMath Tiers 1–3 20.0%, OTIS Mock AIME 2024–2025 81.1%, SimpleQA Verified 11.7%.
Is GPT-5 Nano open source?
No. GPT-5 Nano is proprietary; you use it through OpenAI’s API or partner platforms.
What inputs does GPT-5 Nano support?
GPT-5 Nano accepts text and images and replies in text. It is a reasoning model with minimal, low, medium and high effort settings, supports tool calling and can return structured JSON output.
When was GPT-5 Nano released?
OpenAI released GPT-5 Nano on Aug 7, 2025. Its training data runs to May 30, 2024.
What are the best alternatives to GPT-5 Nano?
The closest current models from other labs on capability, price and release date are Qwen3.5 9B (Alibaba (Qwen), ECI 139.5, $0.10 / $0.15), Gemini 2.5 Flash-Lite (Google, ECI 133.9, $0.10 / $0.40), DeepSeek-V3.1 (DeepSeek, ECI 139.9, $0.385 / $1.25) and Mistral Small 3.2 (Mistral AI, ECI 131.7, $0.10 / $0.30).