GPT 5.1 Codex API price
gpt-5.1-codex
The cheapest GPT 5.1 Codex API is $1.25/M input at OpenRouter (aggregator) - all 2 providers compared below, per 1M tokens.
MidOpenAI400K context2 sellers
Input
$1.25
per 1M tokens · OpenRouter (aggregator)
Output
$10.00
per 1M tokens · OpenRouter (aggregator)
Where to buy it
Cheapest GPT 5.1 Codex API providers compared - 2 sellers, from $1.25/M.
Cost calculator
| Provider | Input $/M | Output $/M | Cached in | Your cost |
|---|---|---|---|---|
| OpenRouter (aggregator)stale | 1.25cheapest | 10.00 | 0.130 | |
| 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
- 23.7est.high
- Sellers
- 2
- Cached input
- $0.13where the source publishes one
- Cheapest at
- OpenRouter (aggregator)
- Combined
- $11.25in + out per 1M
- Last checked
- 2026-09-17