# OpenAI GPT-5.1-Codex

OpenAI GPT-5.1-Codex costs $1.25 per million input tokens and $10.00 per million output tokens, and it scores 15.3 on the Vibe Coding Index from 2 benchmarks, as of October 22, 2026.

Page: https://llmbenchmark.ai/models/gpt-5-1-codex
Data from October 22, 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: $1.25
- Price per million output tokens: $10.00
- Context window: 400K tokens
- Vibe Coding Index: 15.3 (from 2 of 6 coding benchmarks)

Benchmark results (26 of 195):

- SWE-bench Verified: 66.0% (source: SWE-bench (swebench.com), read October 22, 2026)
- LMArena WebDev: 1337 Elo (source: LMArena WebDev, read October 22, 2026)
- AA Intelligence Index: 23.7 (source: Artificial Analysis (via OpenRouter), read October 22, 2026)
- Design Arena: websites: 1161 Elo (source: Design Arena, read October 22, 2026)
- Design Arena: UI components: 1234 Elo (source: Design Arena, read October 22, 2026)
- Design Arena: game dev: 1137 Elo (source: Design Arena, read October 22, 2026)
- Design Arena: data viz: 1213 Elo (source: Design Arena, read October 22, 2026)
- Design Arena: all code categories: 1152 Elo (source: Design Arena, read October 22, 2026)
- Design Arena: agents building web apps: 1018 Elo (source: Design Arena, read October 22, 2026)
- Design Arena: agents building full-stack apps: 1086 Elo (source: Design Arena, read October 22, 2026)
- Design Arena: agents building mobile apps: 1191 Elo (source: Design Arena, read October 22, 2026)
- LiveCodeBench (Vals AI): 85.5% (source: Vals AI boards, read October 22, 2026)
- Vibe Code Bench (Vals AI): 13.1% (source: Vals AI boards, read October 22, 2026)
- AA Math Index: 95.7 (source: Artificial Analysis, read October 22, 2026)
- GPQA Diamond (Artificial Analysis run): 86.0% (source: Artificial Analysis, read October 22, 2026)
- Humanity's Last Exam (Artificial Analysis run): 25.7% (source: Artificial Analysis, read October 22, 2026)
- MMLU Pro (Artificial Analysis run): 86.0% (source: Artificial Analysis, read October 22, 2026)
- LiveCodeBench (Artificial Analysis run): 84.9% (source: Artificial Analysis, read October 22, 2026)
- Terminal-Bench Hard (Artificial Analysis run): 34.8% (source: Artificial Analysis, read October 22, 2026)
- IFBench: 70.0% (source: Artificial Analysis, read October 22, 2026)
- Long context reasoning (AA-LCR): 69.3% (source: Artificial Analysis, read October 22, 2026)
- τ²-Bench Telecom: 83.0% (source: Artificial Analysis, read October 22, 2026)
- AIME 2025 (Artificial Analysis run): 95.7% (source: Artificial Analysis, read October 22, 2026)
- Terminal-Bench: 57.8% (source: Epoch AI benchmarking hub, read October 22, 2026)
- ALE-Bench: 1244.9 (source: ALE-Bench (Sakana AI), read October 22, 2026)
- LMArena WebDev: HTML: 1346 Elo (source: LMArena (Hugging Face dataset), read October 22, 2026)