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Claude Opus 5.5 vs Gemini 3.5 Flash Cyber

Claude Opus 5.5 leads the LLM Stats Score 59.8 to 37.1.

Anthropic · Google · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 59.8 to 37.1, ranking #1 overall.

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

Choose Claude Opus 5.5

  • overall performance matters — it scores 59.8 and ranks #1 on LLM Stats
  • your work emphasizes coding and agents — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Gemini 3.5 Flash Cyber

  • you are already invested in the Google ecosystem

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
Gemini 3.5 Flash Cyber
Google
Core performance indexes
LLM Stats Score
59.8
#1
37.1
#73
Coding
51.8
#1
29.6
#56
Agents
44.6
#2
26.3
#51
Cost, coverage & limits
Benchmark wins
—
—
Input price
$4.00 / M
— / M
Output price
$20.00 / M
— / M
Context window
1,000,000
—

Individual benchmarks

31 reported for Claude Opus 5.5 · 1 for Gemini 3.5 Flash Cyber

No common benchmarks found

Claude Opus 5.5 and Gemini 3.5 Flash Cyberdon'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 Claude Opus 5.5 specifies input context (1,000,000 tokens). Only Claude Opus 5.5 specifies output context (128,000 tokens).

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 3.5 Flash Cyber
Input- tokens
Output- tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Opus 5.5 supports multimodal inputs, whereas Gemini 3.5 Flash Cyber does not.

Claude Opus 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 5.5

Text
Images
Audio
Video

Gemini 3.5 Flash Cyber

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 Opus 5.5

Proprietary

Closed source

Gemini 3.5 Flash Cyber

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while Gemini 3.5 Flash Cyber was released on 2026-07-21.

Claude Opus 5.5 is 2 months newer than Gemini 3.5 Flash Cyber.

Claude Opus 5.5

Sep 22, 2026

0 days ago

2mo newer
Gemini 3.5 Flash Cyber

Jul 21, 2026

2 months ago

Knowledge Cutoff

When training data ends

Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while Gemini 3.5 Flash Cyber's cutoff date is not specified.

We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Gemini 3.5 Flash Cyber's cutoff date.

Claude Opus 5.5

Jun 2026

Gemini 3.5 Flash Cyber

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Opus 5.5 and Gemini 3.5 Flash Cyber side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
Gemini 3.5 Flash Cyber
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs Gemini 3.5 Flash Cyber.

Which is better, Claude Opus 5.5 or Gemini 3.5 Flash Cyber?

Claude Opus 5.5 leads the LLM Stats Score 59.8 to 37.1. Claude Opus 5.5 is made by Anthropic and Gemini 3.5 Flash Cyber 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 Opus 5.5 compare to Gemini 3.5 Flash Cyber in benchmarks?

Claude Opus 5.5 scores BenchCAD (with Python tool): 96.2%, Global-MMLU: 94.3%, SWE-bench Multilingual: 93.9%, MILU: 93.1%, ArXivMath: 91.2%. Gemini 3.5 Flash Cyber scores CyberGym: 83.2%.

What are the context window sizes for Claude Opus 5.5 and Gemini 3.5 Flash Cyber?

Claude Opus 5.5 supports 1.0M tokens and Gemini 3.5 Flash Cyber 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 Opus 5.5 and Gemini 3.5 Flash Cyber?

Key differences include LLM Stats Score (59.8 vs 37.1), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and Gemini 3.5 Flash Cyber?

Claude Opus 5.5 is developed by Anthropic and Gemini 3.5 Flash Cyber is developed by Google.

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