GPT-5.1 vs GPT-5: token pricing & cost compared (July 2026)
How GPT-5.1 (OpenAI) and GPT-5 (OpenAI) actually compare on price — input, output, and total monthly cost at the MAU you care about. Updated against live OpenRouter pricing.
OpenAI
GPT-5.1
- Input
- $1.25 / 1M tokens
- Output
- $10.00 / 1M tokens
- Output / Input ratio
- 8.0×
- Context window
- 400K
OpenAI
GPT-5
- Input
- $1.25 / 1M tokens
- Output
- $10.00 / 1M tokens
- Output / Input ratio
- 8.0×
- Context window
- 400K
The short answer
GPT-5.1 and GPT-5 are priced identically per token — pick on quality, latency, or context window instead.
Token pricing side-by-side
- GPT-5.1
- GPT-5
Cost at your usage
GPT-5.1
Per call
$0.00563
Per user / mo
$0.5625
Total / mo
$563
GPT-5
Per call
$0.00563
Per user / mo
$0.5625
Total / mo
$563
Total monthly bill across MAU
- GPT-5.1
- GPT-5
Same usage profile applied to both models; only the per-token price differs.
Run this against your real numbers
The mini-calculator above is a preview. Use the full tools to model power-user blast radius, gross margin, and 12-month spend forecasts.
Other comparisons
Comparing GPT-5.1 vs GPT-5 on price alone never tells the whole story — output-token weighting, context length, and your usage profile change the answer dramatically. Use the calculators below for the full picture.
Related tools: All comparisons · Cost Per User Calculator · How to calculate LLM cost per user