GPT-5 Codex
GPT-5 Codex from OpenAI — text model on the Opper gateway.
ToolsStructured output
Context window
272K
Max output
128K
Input price
$1.25 /1M
Output price
$10.00 /1M
Benchmarks
Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.
Intelligence Index44.6
Coding Index38.9
Math Index98.7
MMLU-Pro
87%
GPQA Diamond
84%
Humanity's Last Exam
26%
LiveCodeBench
84%
SciCode
41%
AIME 2025
99%
IFBench
74%
Long-context reasoning
69%
Terminal-Bench Hard
38%
τ²-Bench Telecom
87%
See full leaderboard →Benchmarks via Artificial Analysis · View on AA
Available routes
The same GPT-5 Codex runs on 1 route through the Opper gateway. Each route has its own data-handling posture.
| Provider | Region | Zero data retention | Training | Logging | Contract | Input | Output |
|---|---|---|---|---|---|---|---|
| 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 | $1.25 | $10.00 |
Human review: Abuse-flagged only