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Gemini 4 Carbon vs GPT-5.5

Gemini 4 Carbon leads the LLM Stats Score 58.8 to 47.0.

Google · OpenAI · Updated for 2026

Which is better?

Gemini 4 Carbon leads the overall LLM Stats Score 58.8 to 47.0, ranking #2 overall.

In the 1 individual benchmarks reported for both models, Gemini 4 Carbon wins 1; this is a narrower head-to-head signal than the composite indexes.

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

Choose Gemini 4 Carbon

  • overall performance matters — it scores 58.8 and ranks #2 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Oct 2026

Choose GPT-5.5

  • you want predictable pricing at $5.00/M input and $30.00/M output

At a glance

The differences that matter most.

Gemini 4 Carbon
Google
GPT-5.5
OpenAI
Core performance indexes
LLM Stats Score
58.8
#2
47.0
#40
Reasoning
54.4
#5
46.7
#30
Coding
48.3
#3
36.1
#35
Agents
45.8
#1
31.3
#45
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
— / M
$5.00 / M
Output price
— / M
$30.00 / M
Context window
—
1,050,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Gemini 4 Carbon
GPT-5.5
Vision
36.0#13
35.6#15
Tool use
35.4#3
27.1#32
Multimodal
38.0#6
31.8#29
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Gemini 4 Carbon · 28 for GPT-5.5

1 shared

Gemini 4 Carbon outperforms in 1 benchmarks (Graphwalks BFS >128k), while GPT-5.5 is better at 0 benchmarks.

Gemini 4 Carbon significantly outperforms across most benchmarks.

Fri Nov 06 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-5.5 specifies input context (1,050,000 tokens). Only GPT-5.5 specifies output context (128,000 tokens).

Google
Gemini 4 Carbon
Input- tokens
Output- tokens
OpenAI
GPT-5.5
Input1,050,000 tokens
Output128,000 tokens
Fri Nov 06 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 4 Carbon and GPT-5.5 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-5.5

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-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 4 Carbon was released on 2026-10-28, while GPT-5.5 was released on 2026-04-23.

Gemini 4 Carbon is 6 months newer than GPT-5.5.

Gemini 4 Carbon

Oct 28, 2026

1 weeks ago

6mo newer
GPT-5.5

Apr 23, 2026

6 months ago

Knowledge Cutoff

When training data ends

GPT-5.5 has a documented knowledge cutoff of 2025-12-01, while Gemini 4 Carbon's cutoff date is not specified.

We can confirm GPT-5.5's training data extends to 2025-12-01, but cannot make a direct comparison without Gemini 4 Carbon's cutoff date.

Gemini 4 Carbon

—

GPT-5.5

Dec 2025

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Gemini 4 Carbon and GPT-5.5 side-by-side, then vote on the output you prefer.

Gemini 4 Carbon
✓ Preferred
GPT-5.5
Open in Playground

FAQ

Common questions about Gemini 4 Carbon vs GPT-5.5.

Which is better, Gemini 4 Carbon or GPT-5.5?

Gemini 4 Carbon leads the LLM Stats Score 58.8 to 47.0. Gemini 4 Carbon is made by Google and GPT-5.5 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-5.5 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-5.5 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.

What are the context window sizes for Gemini 4 Carbon and GPT-5.5?

Gemini 4 Carbon supports an unknown number of tokens and GPT-5.5 supports 1.1M 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-5.5?

Key differences include LLM Stats Score (58.8 vs 47.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 4 Carbon and GPT-5.5?

Gemini 4 Carbon is developed by Google and GPT-5.5 is developed by OpenAI.

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