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Claude Sonnet 5.5 vs Gemini 4 Argon

Claude Sonnet 5.5 and Gemini 4 Argon are closely matched at 58.3 and 55.1 on the LLM Stats Score.

Anthropic · Google · Updated for 2026

Which is better?

Claude Sonnet 5.5 and Gemini 4 Argon are closely matched on the overall LLM Stats Score at 58.3 and 55.1.

The models split the 6 individual benchmarks reported for both models evenly.

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 Argon

  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

Claude Sonnet 5.5
Anthropic
Gemini 4 Argon
Google
Core performance indexes
LLM Stats Score
58.3
#2
55.1
#4
Reasoning
56.8
#2
52.4
#7
Coding
48.6
#2
44.1
#4
Agents
42.5
#3
40.5
#4
Cost, coverage & limits
Benchmark wins
3 of 6
3 of 6
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 Argon
Vision
40.5#3
36.8#8
Tool use
34.3#2
30.6#6
Multimodal
40.1#2
36.9#8
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

47 reported for Claude Sonnet 5.5 · 19 for Gemini 4 Argon

6 shared

Claude Sonnet 5.5 outperforms in 3 benchmarks (FrontierSWE V2, Terminal-Bench 4.0, Terminal-Bench-Science 0.1), while Gemini 4 Argon is better at 3 benchmarks (AutomationBench, Chartography (no tools), DeepSWE 1.1).

Both models are evenly matched across the benchmarks.

Thu Oct 08 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 Argon
Input- tokens
Output- tokens
Thu Oct 08 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Sonnet 5.5 and Gemini 4 Argon 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 Argon

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 Argon

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 5.5 was released on 2026-09-28, while Gemini 4 Argon was released on 2026-09-30.

Gemini 4 Argon is 0 month newer than Claude Sonnet 5.5.

Claude Sonnet 5.5

Sep 28, 2026

1 weeks ago

Gemini 4 Argon

Sep 30, 2026

1 weeks ago

2d newer

Knowledge Cutoff

When training data ends

Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while Gemini 4 Argon'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 Argon's cutoff date.

Claude Sonnet 5.5

Jun 2026

Gemini 4 Argon

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

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

Claude Sonnet 5.5
✓ Preferred
Gemini 4 Argon
Open in Playground

FAQ

Common questions about Claude Sonnet 5.5 vs Gemini 4 Argon.

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

Claude Sonnet 5.5 and Gemini 4 Argon are closely matched on the LLM Stats Score at 58.3 and 55.1. Claude Sonnet 5.5 is made by Anthropic and Gemini 4 Argon 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 Argon 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 Argon scores Graphwalks BFS <128k: 99.7%, Vibe Code Bench: 91.9%, LVBench: 91.7%, LABBench2: 88.8%, Graphwalks BFS >128k: 84.2%.

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

Claude Sonnet 5.5 supports 1.0M tokens and Gemini 4 Argon 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 Argon?

Key differences include LLM Stats Score (58.3 vs 55.1). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 5.5 and Gemini 4 Argon?

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

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