# OpenAI GPT-5.3-Codex

As of October 21, 2026, OpenAI GPT-5.3-Codex ranks #46 of 213 models overall with 32.5 on the Artificial Analysis Intelligence Index. Its strongest category is reasoning, where it ranks #30 of 203. OpenAI GPT-5.3-Codex costs $1.75 per million input tokens and $14.00 per million output tokens. It was released on February 24, 2026.

Page: https://llmbenchmark.ai/models/gpt-5-3-codex
Data from October 21, 2026. Every figure below names the board it was read from and the day.

- Maker: OpenAI
- Released: February 24, 2026
- Price per million input tokens: $1.75
- Price per million output tokens: $14.00
- Context window: 400K tokens
- Overall rank: 46 of 213, by the Artificial Analysis Intelligence Index
- Artificial Analysis Intelligence Index: 32.5
- Vibe Coding Index: 29.5 (from 1 of 4 coding benchmarks)

Benchmark results (34 of 190):

- LMArena WebDev: 1407 Elo (source: LMArena WebDev, read October 21, 2026)
- AA Intelligence Index: 32.5 (source: Artificial Analysis (via OpenRouter), read October 21, 2026)
- Design Arena: websites: 1163 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: UI components: 1137 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: game dev: 1162 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: data viz: 1164 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: 3D: 1008 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: all code categories: 1145 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: SVG: 1129 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: ASCII art: 1151 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: agents building web apps: 1033 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: agents building full-stack apps: 983 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: agents building mobile apps: 1054 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: agents building Android apps: 1084 Elo (source: Design Arena, read October 21, 2026)
- Design Arena: agents building Godot games: 1124 Elo (source: Design Arena, read October 21, 2026)
- LiveCodeBench (Vals AI): 87.3% (source: Vals AI boards, read October 21, 2026)
- SWE-bench Verified (Vals AI): 78.0% (source: Vals AI boards, read October 21, 2026)
- Vibe Code Bench (Vals AI): 61.8% (source: Vals AI boards, read October 21, 2026)
- IOI (Vals AI): 53.8% (source: Vals AI boards, read October 21, 2026)
- GPQA Diamond (Artificial Analysis run): 91.5% (source: Artificial Analysis, read October 21, 2026)
- Humanity's Last Exam (Artificial Analysis run): 42.5% (source: Artificial Analysis, read October 21, 2026)
- Terminal-Bench Hard (Artificial Analysis run): 53.0% (source: Artificial Analysis, read October 21, 2026)
- IFBench: 75.4% (source: Artificial Analysis, read October 21, 2026)
- Long context reasoning (AA-LCR): 83.3% (source: Artificial Analysis, read October 21, 2026)
- τ²-Bench Telecom: 86.0% (source: Artificial Analysis, read October 21, 2026)
- Terminal-Bench: 78.4% (source: Epoch AI benchmarking hub, read October 21, 2026)
- WeirdML: 79.3% (source: Epoch AI benchmarking hub, read October 21, 2026)
- METR time horizons: 74.5% (source: Epoch AI benchmarking hub, read October 21, 2026)
- ALE-Bench: 1655.2 (source: ALE-Bench (Sakana AI), read October 21, 2026)
- Vending-Bench 2: $5,940 (source: Epoch AI benchmarking hub, read October 21, 2026)
- Epoch Capabilities Index: 157.1 (source: Epoch AI benchmarking hub, read October 21, 2026)
- LMArena WebDev: React: 1395 Elo (source: LMArena (Hugging Face dataset), read October 21, 2026)
- LMArena WebDev: HTML: 1422 Elo (source: LMArena (Hugging Face dataset), read October 21, 2026)
- LMArena WebDev: from an image: 1443 Elo (source: LMArena (Hugging Face dataset), read October 21, 2026)