# OpenAI GPT-5.1-Codex-Mini

OpenAI GPT-5.1-Codex-Mini costs $0.25 per million input tokens and $2.00 per million output tokens, as of October 21, 2026. Only one of the 6 coding benchmarks behind the index has measured it, and the index needs two, so there is not enough data for a coding score. 21 benchmarks outside the index have a result below.

Page: https://llmbenchmark.ai/models/gpt-5-1-codex-mini
Data from October 21, 2026. Every figure below names the board it was read from and the day.

- Maker: OpenAI
- Released: November 13, 2025
- Price per million input tokens: $0.25
- Price per million output tokens: $2.00
- Context window: 400K tokens
- Vibe Coding Index: not enough data (one index benchmark; at least two are needed to rank)

Benchmark results (22 of 195):

- LMArena WebDev: 1244 Elo (source: LMArena WebDev, read October 21, 2026)
- AA Intelligence Index: 20.4 (source: Artificial Analysis (via OpenRouter), read October 21, 2026)
- Design Arena: websites: 1111 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: UI components: 1081 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: game dev: 1092 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: data viz: 1097 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: 3D: 988 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: all code categories: 1094 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: SVG: 978 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: ASCII art: 1105 Elo (source: Design Arena, read October 21, 2026)
- AA Math Index: 91.7 (source: Artificial Analysis, read October 21, 2026)
- GPQA Diamond (Artificial Analysis run): 81.3% (source: Artificial Analysis, read October 21, 2026)
- Humanity's Last Exam (Artificial Analysis run): 18.5% (source: Artificial Analysis, read October 21, 2026)
- MMLU Pro (Artificial Analysis run): 82.0% (source: Artificial Analysis, read October 21, 2026)
- LiveCodeBench (Artificial Analysis run): 83.6% (source: Artificial Analysis, read October 21, 2026)
- Terminal-Bench Hard (Artificial Analysis run): 33.3% (source: Artificial Analysis, read October 21, 2026)
- IFBench: 67.9% (source: Artificial Analysis, read October 21, 2026)
- Long context reasoning (AA-LCR): 66.7% (source: Artificial Analysis, read October 21, 2026)
- τ²-Bench Telecom: 62.9% (source: Artificial Analysis, read October 21, 2026)
- AIME 2025 (Artificial Analysis run): 91.7% (source: Artificial Analysis, read October 21, 2026)
- Terminal-Bench: 61.6% (source: Epoch AI benchmarking hub, read October 21, 2026)
- LMArena WebDev: HTML: 1253 Elo (source: LMArena (Hugging Face dataset), read October 21, 2026)