GPT-5 Nano
$0.05 per 1M input tokens and $0.40 per 1M output tokens · 400K context · vision, tools, reasoning, JSON.
Prices checked Oct 21, 2026 · tracked by LLM Cost Index since Oct 21, 2026
Cheaper ways to run the same model: GPT-5 Nano (batch) at $0.025 / $0.20 — same model, different service (e.g. batch processing with a delay).
What GPT-5 Nano costs per month
Estimated monthly bill for typical workloads, using the cached-input price for repeated context. Try your own numbers in the cost calculator.
| Workload | Per month |
|---|---|
| Customer chatbot 1,000 conversations a day, 8 turns each | $41.88 |
| Document Q&A (RAG) 500 questions a day over retrieved documents | $7.10 |
| Coding / tool-using agent 200 tasks a day, long tool-heavy contexts | $15.45 |
| Content generation 30 long articles a day | $1.04 |
| Classification / extraction 100,000 short items a day | $63.00 |
Price history
We started tracking GPT-5 Nano on Oct 21, 2026; the chart appears as soon as there is a second data point. See all recent price changes.
Where to run GPT-5 Nano: 4 providers
OpenAI is the cheapest at $0.025 input / $0.20 output per 1M tokens. Uptime is the average over the last 30 days as reported by OpenRouter; see provider reliability.
Cheaper alternatives to GPT-5 Nano
Models with the same tool calling, image input, structured output for at least 20% less (3:1 input/output mix), most capable first.
| Model | Input / 1M | Output / 1M | Context | Capabilities |
|---|---|---|---|---|
| GLM 5.3 Flash Z.ai | $0.041 | $0.12 | 1.05M | visiontoolsreasoningJSONopen weights |
| Ling 3.0 Flash VL inclusionAI | $0.06 | $0.18 | 131K | visiontoolsreasoningJSONopen weights |
| Qwen3.5-9B Qwen | $0.08 | $0.13 | 262K | visiontoolsreasoningJSONopen weights |
| Ministral 3 3B 2512 Mistral AI | $0.10 | $0.10 | 131K | visiontoolsJSONopen weights |
| Gemma 3 12B | $0.05 | $0.15 | 131K | visiontoolsJSONopen weights |
How to pay less for GPT-5 Nano
For a customer chatbot (1,000 conversations a day, 8 turns each) that costs $51.60 a month at list price without caching:
| Option | Per month | You save |
|---|---|---|
| Move to GLM 5.3 Flash (similar capabilities) | $16.82 | $34.78 (67%) |
| Switch to GPT-5 Nano (batch) | $25.80 | $25.80 (50%) |
| Route to OpenAI (flex tier) | $25.80 | $25.80 (50%) |
| Use prompt caching (60% of input cached) | $41.88 | $9.72 (19%) |
Other workloads: cut-your-bill tool for GPT-5 Nano.
Specifications
| Model ID | openai/gpt-5-nano |
| Input | text, image, file |
| Output | text |
| Tool calling | Yes |
| Structured output | Yes |
| Reasoning mode | Yes |
| Open weights | No |
| Knowledge cutoff | 2024-05-31 |
| Released | Aug 7, 2025 |
| Web search | $0.01 per request |
FAQ
- How much does GPT-5 Nano cost?
- $0.05 per million input tokens and $0.40 per million output tokens; cached input costs $0.0050 per million. Prices as of Oct 21, 2026.
- What is the context window of GPT-5 Nano?
- 400K tokens, with up to 128K output tokens per response.
- Does GPT-5 Nano support images, tools and structured output?
- Images as input: yes. Tool calling: yes. Structured (JSON) output: yes. Reasoning mode: yes.
- What are cheaper alternatives to GPT-5 Nano?
- Models with the same key capabilities for at least 20% less include GLM 5.3 Flash ($0.041 / $0.12), Ling 3.0 Flash VL ($0.06 / $0.18), Qwen3.5-9B ($0.08 / $0.13).
More from OpenAI: all OpenAI models · how we collect prices