The AI arena is free today

Open Superagent

Gemini 4 Argon vs GPT-5.1 Codex

Gemini 4 Argon leads the LLM Stats Score 55.4 to 29.4.

Google · OpenAI · Updated for 2026

Which is better?

Gemini 4 Argon leads the overall LLM Stats Score 55.4 to 29.4, ranking #4 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 4 Argon

  • overall performance matters — it scores 55.4 and ranks #4 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose GPT-5.1 Codex

  • you want predictable pricing at $1.25/M input and $10.00/M output

At a glance

The differences that matter most.

Gemini 4 Argon
Google
GPT-5.1 Codex
OpenAI
Core performance indexes
LLM Stats Score
55.4
#4
29.4
#143
Reasoning
53.3
#6
29.6
#136
Coding
43.0
#7
20.8
#105
Agents
40.9
#4
10.4
#128
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$1.25 / M
Output price
— / M
$10.00 / M
Context window
—
400,000

Individual benchmarks

19 reported for Gemini 4 Argon · 3 for GPT-5.1 Codex

No common benchmarks found

Gemini 4 Argon and GPT-5.1 Codexdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-5.1 Codex specifies input context (400,000 tokens). Only GPT-5.1 Codex specifies output context (128,000 tokens).

Google
Gemini 4 Argon
Input- tokens
Output- tokens
OpenAI
GPT-5.1 Codex
Input400,000 tokens
Output128,000 tokens
Tue Oct 13 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 4 Argon and GPT-5.1 Codex support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 4 Argon

Text
Images
Audio
Video

GPT-5.1 Codex

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 4 Argon

Proprietary

Closed source

GPT-5.1 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 4 Argon was released on 2026-09-30, while GPT-5.1 Codex was released on 2025-11-19.

Gemini 4 Argon is 11 months newer than GPT-5.1 Codex.

Gemini 4 Argon

Sep 30, 2026

1 weeks ago

10mo newer
GPT-5.1 Codex

Nov 19, 2025

10 months ago

Knowledge Cutoff

When training data ends

GPT-5.1 Codex has a documented knowledge cutoff of 2024-09-30, while Gemini 4 Argon's cutoff date is not specified.

We can confirm GPT-5.1 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without Gemini 4 Argon's cutoff date.

Gemini 4 Argon

—

GPT-5.1 Codex

Sep 2024

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Gemini 4 Argon and GPT-5.1 Codex side-by-side, then vote on the output you prefer.

Gemini 4 Argon
✓ Preferred
GPT-5.1 Codex
Open in Playground

FAQ

Common questions about Gemini 4 Argon vs GPT-5.1 Codex.

Which is better, Gemini 4 Argon or GPT-5.1 Codex?

Gemini 4 Argon leads the LLM Stats Score 55.4 to 29.4. Gemini 4 Argon is made by Google and GPT-5.1 Codex is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 4 Argon compare to GPT-5.1 Codex in benchmarks?

Gemini 4 Argon scores Graphwalks BFS <128k: 99.7%, Vibe Code Bench: 91.9%, LVBench: 91.7%, LABBench2: 88.8%, Graphwalks BFS >128k: 84.2%. GPT-5.1 Codex scores SWE-Bench Verified: 73.7%, SWE-Lancer: 66.3%, Terminal-Bench 2.0: 52.8%.

What are the context window sizes for Gemini 4 Argon and GPT-5.1 Codex?

Gemini 4 Argon supports an unknown number of tokens and GPT-5.1 Codex supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 4 Argon and GPT-5.1 Codex?

Key differences include LLM Stats Score (55.4 vs 29.4). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 4 Argon and GPT-5.1 Codex?

Gemini 4 Argon is developed by Google and GPT-5.1 Codex is developed by OpenAI.

Related comparisons