OpenAI: GPT-5 Nano vs OpenAI: GPT-5.1
OpenAI: GPT-5 Nano is cheaper than OpenAI: GPT-5.1 by about 96% on a blended (75% input / 25% output) basis. OpenAI: GPT-5 Nano charges $0.050000 / $0.400000 per 1M input/output tokens; OpenAI: GPT-5.1 charges $1.250000 / $10.000000.
| Field | OpenAI: GPT-5 Nano | OpenAI: GPT-5.1 |
|---|---|---|
| Input $/Mtok | $0.050000 | $1.250000 |
| Output $/Mtok | $0.400000 | $10.000000 |
| Cache read $/Mtok | $0.005000 | $0.125000 |
| Cache write $/Mtok | – | – |
| Input $/Mchar | 0.014086 | 0.352142 |
| Output $/Mchar | 0.112686 | 2.817139 |
| Context window | 400000 | 400000 |
| Tokenizer | o200k | o200k |
| Confidence? | api | api |
| Source | openrouter | openrouter |
Confidence: official = vendor pricing page · api = OpenRouter per-host · aggregator = community list, may lag · unreviewed = automatic extraction awaiting review. When sources disagree the most authoritative wins. Details: /methodology#confidence
Price history
Same workload, monthly cost
Illustrative monthly cost at 10M tokens/month, split per workload preset. Not a substitute for the calculator, which uses your own volume, cache and batch assumptions.
| Workload | OpenAI: GPT-5 Nano | OpenAI: GPT-5.1 |
|---|---|---|
| Coding agent | $0.68 | $16.88 |
| RAG chat | $1.03 | $25.63 |
| Summarisation (batch) | $0.85 | $21.25 |
| Classification | $0.57 | $14.25 |
| Chat assistant | $1.90 | $47.50 |
| Content generation | $3.30 | $82.50 |
Cite this page
OpenAI: GPT-5 Nano vs OpenAI: GPT-5.1: $0.050000/$0.400000 vs $1.250000/$10.000000 per 1M tokens as of 2026-10-04. Token Barometer by Dejan Strbad, https://tokenbarometer.com, data CC BY 4.0. https://tokenbarometer.com/compare/openai_gpt-5-nano-vs-openai_gpt-5.1
OpenAI: GPT-5 Nano page | OpenAI: GPT-5.1 page | Open in calculator