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Gemini 4 Carbon vs GPT-5.1 Codex High

Gemini 4 Carbon leads the LLM Stats Score 59.0 to 29.0.

Google · OpenAI · Updated for 2026

Which is better?

Gemini 4 Carbon leads the overall LLM Stats Score 59.0 to 29.0, ranking #2 overall.

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

Choose Gemini 4 Carbon

  • overall performance matters — it scores 59.0 and ranks #2 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Oct 2026

Choose GPT-5.1 Codex High

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

At a glance

The differences that matter most.

Gemini 4 Carbon
Google
GPT-5.1 Codex High
OpenAI
Core performance indexes
LLM Stats Score
59.0
#2
29.0
#160
Reasoning
54.9
#5
28.8
#153
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$1.25 / M
Output price
— / M
$10.00 / M
Context window
—
400,000

Individual benchmarks

16 reported for Gemini 4 Carbon · 1 for GPT-5.1 Codex High

No common benchmarks found

Gemini 4 Carbon and GPT-5.1 Codex Highdon'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 High specifies input context (400,000 tokens). Only GPT-5.1 Codex High specifies output context (128,000 tokens).

Google
Gemini 4 Carbon
Input- tokens
Output- tokens
OpenAI
GPT-5.1 Codex High
Input400,000 tokens
Output128,000 tokens
Sat Oct 31 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

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

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

Gemini 4 Carbon

Text
Images
Audio
Video

GPT-5.1 Codex High

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 Carbon

Proprietary

Closed source

GPT-5.1 Codex High

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 4 Carbon was released on 2026-10-28, while GPT-5.1 Codex High was released on 2025-11-12.

Gemini 4 Carbon is 12 months newer than GPT-5.1 Codex High.

Gemini 4 Carbon

Oct 28, 2026

3 days ago

11mo newer
GPT-5.1 Codex High

Nov 12, 2025

11 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

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

Gemini 4 Carbon
✓ Preferred
GPT-5.1 Codex High
Open in Playground

FAQ

Common questions about Gemini 4 Carbon vs GPT-5.1 Codex High.

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

Gemini 4 Carbon leads the LLM Stats Score 59.0 to 29.0. Gemini 4 Carbon is made by Google and GPT-5.1 Codex High 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 Carbon compare to GPT-5.1 Codex High in benchmarks?

Gemini 4 Carbon scores Gray Swan IPI Benchmark: 100.0%, Vending-Bench 2: 100.0%, Graphwalks BFS >128k: 96.2%, WebDev Arena: 88.4%, SEC-bench Pro: 88.2%. GPT-5.1 Codex High scores AIME 2025: 96.7%.

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

Gemini 4 Carbon supports an unknown number of tokens and GPT-5.1 Codex High 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 Carbon and GPT-5.1 Codex High?

Key differences include LLM Stats Score (59.0 vs 29.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 4 Carbon and GPT-5.1 Codex High?

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

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