GPT-5.1-Codex

OpenAI

GPT-5.1-Codex by OpenAI costs — per 1M input tokens and — per 1M output tokens, with a —-token context window.

Pricing

Input (per 1M tokens)

—

Output (per 1M tokens)

—

Cached input (per 1M)

—

Specifications

Provider: OpenAI
Context window: —
Parameters: —
Released: Nov 2025
Open weights: No
Frontier model: No

Benchmarks

LiveBench: 69.3

Compare GPT-5.1-Codex with…

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FAQ

How much does GPT-5.1-Codex cost?

GPT-5.1-Codex is priced at — per 1M input tokens and — per 1M output tokens. Output tokens cost more than input.

What is GPT-5.1-Codex's context window?

GPT-5.1-Codex supports a context window of — tokens — the maximum prompt plus response length it can handle in a single request.

Is GPT-5.1-Codex open weight?

No — GPT-5.1-Codex is a closed/proprietary model accessed via API.

Data as of 2026-10-15. Source: Epoch AI, Data on AI Models (CC BY 4.0), epoch.ai. Pricing is per 1M tokens (USD); confirm with the provider before production use.