GPT-5.1-Codex
OPENAI Developer Architecture Profile
Intelligence (ELO)1481Chatbot Arena Verified
Max Context Limit400,000Max Out: 128,000 tokens
Prompt Caching90% OFF$0.13 / 1M cached
Standard API / 1M$11.25Blended Standard Rate
Model Capabilities & Contract SLAs
- Coding & Logic
- Fictional
- Agentic
- 📋 Strict JSON Schema
- 🛠️ Native Tool Calling
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Granular Pricing Matrix
Input Tokens (Standard Prompt)$1.25 / 1M
⚡ Cached Input (Prompt Cache Read)90% OFF$0.13 / 1M
Output Tokens (Completion)$10.00 / 1M
Pricing data via OpenRouter. Sync: 10/2/2026
Evaluate Competitors
VS Engine MatchupGPT-5.1-Codex vs MoonshotAI: Kimi K3VS Engine MatchupGPT-5.1-Codex vs Google: Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)VS Engine MatchupGPT-5.1-Codex vs Sao10K: Llama 3.3 Euryale 70BVS Engine MatchupGPT-5.1-Codex vs OpenAI: o1VS Engine MatchupGPT-5.1-Codex vs OpenAI: GPT-4o-mini (2024-07-18)VS Engine MatchupGPT-5.1-Codex vs Google: Nano Banana Pro (Gemini 3 Pro Image)