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OpenAI: GPT-5.1-Codex

🏆 Frontier Class

DEVELOPED BY: Openai • LAST UPDATED: 7/4/2026

Compare Model
CCI (Capability)97.3Consensus: High consensus ✓
Context Window400,000Max token length
In/Out Pricing$1.25/$10Blended cost/1M: $3.44
Pulse (Popularity)40/100Adoption + discussion proxy

Model Description

OpenRouter model gateway for OpenAI: GPT-5.1-Codex.

Domain Averages

Reasoning95.6%
Coding100%
Math100%
Preference93.5%

Jury & Benchmark Signals

Source / HarnessScore
GPQA-Diamond72.5%
Humanity's Last Exam68.1%
MMLU-Pro89.2%
SWE-bench Verified58.2%
LiveCodeBench65.4%
AIME83.7%
LMArena style-controlled Elo1318

Consensus Discrepancy (Spread: 7.8 pts)

Source
Normalized
CCI Dev.
GPQA-Diamond
94.7
-2.6
Humanity's Last Exam
100
+2.7
MMLU-Pro
92.2
-5.1
SWE-bench Verified
100
+2.7
LiveCodeBench
100
+2.7
AIME
100
+2.7
LMArena style-controlled Elo
93.5
-3.8

Supported Modalities

INPUT:
text
OUTPUT:
text

Search Tags

#reasoning#multimodal#coding#agentic

How to Use This Model

Python SDK Integration:
import openai

client = openai.OpenAI(
  base_url="https://openrouter.ai/api/v1",
  api_key="YOUR_OPENROUTER_KEY"
)

response = client.chat.completions.create(
  model="openai/gpt-5.1-codex",
  messages=[
    {"role": "user", "content": "Explain quantum entanglement in 1 sentence."}
  ]
)
cURL Terminal Request:
curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.1-codex",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'

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