Curiosity · AI Model
GPT-5 nano
GPT-5 nano is the smallest member of the GPT-5 family, released in August 2025 as a low-cost, low-latency companion to GPT-5 mini and flagship GPT-5. It is tuned for the kinds of tasks that used to require fine-tuned GPT-3.5: classification, routing, short completions, and embedded UX features where cost-per-call is measured in hundredths of a cent.
Model specs
- Vendor
- OpenAI
- Family
- GPT-5
- Released
- 2025-08
- Context window
- 400,000 tokens
- Modalities
- text, code
- Input price
- $0.05/M tok
- Output price
- $0.4/M tok
- Pricing as of
- 2026-04-20
Strengths
- Extremely low cost — suitable for always-on background tasks
- Sub-second typical latency for short completions
- Shares safety tuning and instruction stack with bigger siblings
- Good enough for classification and extraction jobs
Limitations
- Meaningful drop in reasoning and coding vs. mini/flagship
- No vision input — text-only as of April 2026
- Not recommended for user-facing agent dialogues where quality matters
Use cases
- Intent classification and request routing in agent systems
- Auto-complete, spell-check, and embedded UX features
- Very-high-volume summarisation and labeling pipelines
- Educational tutoring widgets and quick lookups
Benchmarks
| Benchmark | Score | As of |
|---|---|---|
| MMLU | ≈75% | 2025-10 |
| HumanEval | ≈78% | 2025-10 |
| IFEval (instruction following) | ≈82% | 2025-10 |
Frequently asked questions
What is GPT-5 nano?
GPT-5 nano is the smallest and cheapest tier of OpenAI's GPT-5 model family, released August 2025. It is designed for tasks like classification, routing, and auto-complete where latency and cost-per-call dominate quality requirements.
What is GPT-5 nano good for?
High-volume short-completion tasks: intent classification, query routing, spam filtering, labeling, auto-complete, and educational widgets. It is not intended to replace GPT-5 mini for full conversations.
How much does GPT-5 nano cost?
As of April 2026, GPT-5 nano is priced around USD 0.05 per million input tokens and USD 0.40 per million output tokens — about 5x cheaper than GPT-5 mini and 25x cheaper than flagship GPT-5.
Can GPT-5 nano process images?
As of April 2026, GPT-5 nano is text-only. For vision tasks at low cost, use GPT-5 mini or GPT-4.1 mini instead.
Sources
- OpenAI — Introducing GPT-5 — accessed 2026-04-20
- OpenAI — Pricing — accessed 2026-04-20