The AI arena is free today

Open Superagent

Claude Sonnet 5.5 vs Gemini 4 Carbon

Claude Sonnet 5.5 and Gemini 4 Carbon are closely matched at 57.9 and 59.0 on the LLM Stats Score.

Anthropic · Google · Updated for 2026

Which is better?

Claude Sonnet 5.5 and Gemini 4 Carbon are closely matched on the overall LLM Stats Score at 57.9 and 59.0.

In the 5 individual benchmarks reported for both models, Gemini 4 Carbon wins 4; 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 Claude Sonnet 5.5

  • you want predictable pricing at $2.00/M input and $10.00/M output

Choose Gemini 4 Carbon

  • you value its reported benchmark strengths — it wins 4 of 5 exact shared results
  • you want the most recent training data — it shipped Oct 2026

At a glance

The differences that matter most.

Claude Sonnet 5.5
Anthropic
Gemini 4 Carbon
Google
Core performance indexes
LLM Stats Score
57.9
#3
59.0
#2
Reasoning
56.2
#2
54.9
#5
Coding
48.5
#2
48.1
#3
Agents
43.8
#4
46.0
#2
Cost, coverage & limits
Benchmark wins
1 of 5
4 of 5
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Sonnet 5.5
Gemini 4 Carbon
Vision
39.8#6
36.0#12
Tool use
36.2#2
35.8#3
Multimodal
40.0#3
38.0#6
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

47 reported for Claude Sonnet 5.5 · 16 for Gemini 4 Carbon

5 shared

Claude Sonnet 5.5 outperforms in 1 benchmarks (FrontierSWE V2), while Gemini 4 Carbon is better at 4 benchmarks (AutomationBench, Chartography (no tools), OSWorld 2.1 (partial), Terminal-Bench-Science 0.1).

Gemini 4 Carbon significantly outperforms across most benchmarks.

Thu Oct 29 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Sonnet 5.5 specifies input context (1,000,000 tokens). Only Claude Sonnet 5.5 specifies output context (128,000 tokens).

Anthropic
Claude Sonnet 5.5
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 4 Carbon
Input- tokens
Output- tokens
Thu Oct 29 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Sonnet 5.5 and Gemini 4 Carbon support multimodal inputs.

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

Claude Sonnet 5.5

Text
Images
Audio
Video

Gemini 4 Carbon

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.

Claude Sonnet 5.5

Proprietary

Closed source

Gemini 4 Carbon

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 5.5 was released on 2026-09-28, while Gemini 4 Carbon was released on 2026-10-28.

Gemini 4 Carbon is 1 month newer than Claude Sonnet 5.5.

Claude Sonnet 5.5

Sep 28, 2026

1 months ago

Gemini 4 Carbon

Oct 28, 2026

1 days ago

1mo newer

Knowledge Cutoff

When training data ends

Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while Gemini 4 Carbon's cutoff date is not specified.

We can confirm Claude Sonnet 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Gemini 4 Carbon's cutoff date.

Claude Sonnet 5.5

Jun 2026

Gemini 4 Carbon

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

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

Claude Sonnet 5.5
✓ Preferred
Gemini 4 Carbon
Open in Playground

FAQ

Common questions about Claude Sonnet 5.5 vs Gemini 4 Carbon.

Which is better, Claude Sonnet 5.5 or Gemini 4 Carbon?

Claude Sonnet 5.5 and Gemini 4 Carbon are closely matched on the LLM Stats Score at 57.9 and 59.0. Claude Sonnet 5.5 is made by Anthropic and Gemini 4 Carbon is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Sonnet 5.5 compare to Gemini 4 Carbon in benchmarks?

Claude Sonnet 5.5 scores BenchCAD (with Python tool): 96.3%, ArXivMath (with tools): 95.2%, Global-MMLU: 92.1%, MILU: 91.6%, SWE-bench Multilingual: 90.3%. 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%.

What are the context window sizes for Claude Sonnet 5.5 and Gemini 4 Carbon?

Claude Sonnet 5.5 supports 1.0M tokens and Gemini 4 Carbon supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Sonnet 5.5 and Gemini 4 Carbon?

Key differences include LLM Stats Score (57.9 vs 59.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 5.5 and Gemini 4 Carbon?

Claude Sonnet 5.5 is developed by Anthropic and Gemini 4 Carbon is developed by Google.

Related comparisons