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GPT 5.1 (latest) API price
gpt-5.1
The cheapest GPT 5.1 (latest) API is $1.25/M input at Official - OpenAI - all 3 providers compared below, per 1M tokens.
Rolling name - always points to the newest snapshot of this model. The pinned snapshots are priced separately: GPT 5.1 (11-13 snapshot).
MidOpenAI400K context3 sellers
Input
$1.25
per 1M tokens · Official - OpenAI
Output
$10.00
per 1M tokens · Official - OpenAI
Where to buy it
Cheapest GPT 5.1 (latest) API providers compared - 3 sellers, from $1.25/M.
Cost calculator
| Provider | Input $/M | Output $/M | Cached in | Your cost |
|---|---|---|---|---|
| Official - OpenAI | 1.25cheapest | 10.00 | 0.125 | |
| Batch | 0.625 | 5.00 | 0.062 | |
| Flex | 0.625 | 5.00 | 0.062 | |
| Priority | 2.50 | 20.00 | 0.250 | |
| OpenRouter (aggregator)stale | 1.25 | 10.00 | 0.125 | |
| Batchstale | 0.625 | 5.00 | 0.062 | |
| OrcaRouter (aggregator) | 1.25 | 10.00 | - |
Against its tier
- This model$11.25
- Cheapest · Nemotron 3.5 Content Safety$0.40
- Tier median · GLM 5$4.20
- Dearest · GPT 5.5 Cyber$87.50
#26 of 34 mid · cheaper than 24%
Details
- Context window
- 400K400,000 tokens
- Developer
- OpenAI
- Intelligence
- 24.7est.high
- Sellers
- 3
- Cached input
- $0.125where the source publishes one
- Cheapest at
- Official - OpenAI
- Combined
- $11.25in + out per 1M
- Last checked
- 2026-09-17