GPT-5.1 Codex Mini
Fast, efficient code model via Azure OpenAI (EU region)
ToolsStructured output
Context window
272K
Max output
128K
Input price
$0.25 /1M
Output price
$2.00 /1M
Benchmarks
Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.
Intelligence Index38.6
Coding Index36.4
Math Index91.7
MMLU-Pro
82%
GPQA Diamond
81%
Humanity's Last Exam
17%
LiveCodeBench
84%
SciCode
43%
AIME 2025
92%
IFBench
68%
Long-context reasoning
63%
Terminal-Bench Hard
33%
τ²-Bench Telecom
63%
See full leaderboard →Benchmarks via Artificial Analysis · View on AA
Available routes
The same GPT-5.1 Codex Mini runs on 2 different routes through the Opper gateway. Each route has its own data-handling posture.
| Provider | Region | Zero data retention | Training | Logging | Contract | Input | Output |
|---|---|---|---|---|---|---|---|
| Azure OpenAI | EU | Opt-in | No | Up to 30 days for abuse monitoring | EA/MCA-E | $0.25 | $2.00 |
| OpenAI | US | Opt-in | No (opt-in) | Up to 30 days for abuse monitoring on stateless endpoints. Stateful endpoints (Conversations, ChatKit, Vector Stores) retain until deleted. | Enterprise | $0.25 | $2.00 |
Human review: Abuse-flagged only