GPT-5.1 Codex

openai/gpt-5.1-codex

codingagenticreasoningtoolscodex

Input price

799.0 RODI/M

~ 1.25 USD/M

Output price

6391.8 RODI/M

~ 10 USD/M

Context

400K

Max output

128K

Input:textimage

Output:text

Providers & pricing

Provider	Input	Output	Free tier
Azure Default	799.0 RODI/M~1.25 USD/M	6391.8 RODI/M	—
OpenAI	799.0 RODI/M~1.25 USD/M	6391.8 RODI/M	—

Rate	RODI	USD (ref.)	Unit
In	799.0	~ 1.25	USD/M · RODI/M
Out	6391.8	~ 10.00	USD/M · RODI/M
Cached	79.9	~ 0.125	USD/M · RODI/M

RODI prices include RodiumAi markup and upstream fees. USD figures are wholesale reference rates.

Streaming

Tool calling

Vision

JSON mode

Reasoning

GPT-5.1 optimized for agentic coding in Codex / Responses API.

Use the canonical model slug in your chat completion requests.

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