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GPT 5.1 Codex Max API price
openai/gpt-5.1-codex-max
GPT 5.1 Codex Max API costs $1.25/M input at OpenRouter (aggregator), per 1M tokens.
FlagshipOpenAI400K context1 seller
Input
$1.25
per 1M tokens · OpenRouter (aggregator)
Output
$10.00
per 1M tokens · OpenRouter (aggregator)
Where to buy it
The one source pricing GPT 5.1 Codex Max today, per 1M tokens.
| Provider | Input $/M | Output $/M | Cached in |
|---|---|---|---|
| OpenRouter (aggregator) | 1.25cheapest | 10.00 | 0.125 |
Against its tier
- This model$11.25
- Cheapest · GLM 5.3 Flash$0.29
- Tier median · Kimi K3$9.00
- Dearest · GPT 5.5 Pro (04-23 snapshot)$330.00
#18 of 32 flagship · cheaper than 45%
Details
- Context window
- 400K400,000 tokens
- Developer
- OpenAI
- Sellers
- 1
- Cheapest at
- OpenRouter (aggregator)
- Cached input
- $0.125where the source publishes one
- Combined
- $11.25in + out per 1M
- Last checked
- 2026-08-28