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MicrosoftCurrent

GPT-5.1 Codex Mini

Lightweight code-focused model for developer tooling.

Context Window

400K tokens

≈ 300K words

Input Price

$0.25

per 1M tokens

Output Price

$2

per 1M tokens

Released

November 2025

Capabilities

Vision / Image inputTool / Function calling

Best for

Efficient coding model optimized for Codex development tools with multimodal support.

Strengths

  • Coding
  • Code completion
  • Speed
  • Cost efficiency

API identifier

gpt-5.1-codex-mini

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