Model Comparison

Claude Opus 4.6 vs Gemini 3.5 Flash

Gemini 3.5 Flash shows notably better performance in the majority of benchmarks. Gemini 3.5 Flash is 3.0x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

9 benchmarks

Claude Opus 4.6 outperforms in 3 benchmarks (Finance Agent, Humanity's Last Exam, MRCR v2 (8-needle)), while Gemini 3.5 Flash is better at 6 benchmarks (ARC-AGI v2, CharXiv-R, GDPval-AA, MCP Atlas, MMMU-Pro, Terminal-Bench 2.0).

Gemini 3.5 Flash shows notably better performance in the majority of benchmarks.

Wed May 20 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3.5 Flash costs less

For input processing, Claude Opus 4.6 ($5.00/1M tokens) is 3.3x more expensive than Gemini 3.5 Flash ($1.50/1M tokens).

For output processing, Claude Opus 4.6 ($25.00/1M tokens) is 2.8x more expensive than Gemini 3.5 Flash ($9.00/1M tokens).

In conclusion, Claude Opus 4.6 is more expensive than Gemini 3.5 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers

Wed May 20 2026 • llm-stats.com

Claude Opus 4.6

Input tokens$5.00

Output tokens$25.00

Best providerAnthropic

Gemini 3.5 Flash

Input tokens$1.50

Output tokens$9.00

Best providerGoogle

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Context Window

Maximum input and output token capacity

Gemini 3.5 Flash accepts 1,048,576 input tokens compared to Claude Opus 4.6's 1,000,000 tokens. Claude Opus 4.6 can generate longer responses up to 128,000 tokens, while Gemini 3.5 Flash is limited to 65,536 tokens.

Claude Opus 4.6

Input1,000,000 tokens

Output128,000 tokens

Gemini 3.5 Flash

Input1,048,576 tokens

Output65,536 tokens

Wed May 20 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.6 and Gemini 3.5 Flash support multimodal inputs.

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

Claude Opus 4.6

Text

Images

Audio

Video

Gemini 3.5 Flash

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 4.6

Proprietary

Closed source

Gemini 3.5 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.6 was released on 2026-02-05, while Gemini 3.5 Flash was released on 2026-05-19.

Gemini 3.5 Flash is 3 months newer than Claude Opus 4.6.

Claude Opus 4.6

Feb 5, 2026

3 months ago

Gemini 3.5 Flash

May 19, 2026

1 days ago

3mo newer

Knowledge Cutoff

When training data ends

Gemini 3.5 Flash has a documented knowledge cutoff of 2026-01-31, while Claude Opus 4.6's cutoff date is not specified.

We can confirm Gemini 3.5 Flash's training data extends to 2026-01-31, but cannot make a direct comparison without Claude Opus 4.6's cutoff date.

Claude Opus 4.6

—

Gemini 3.5 Flash

Jan 2026

Provider Availability

Claude Opus 4.6 is available from Anthropic. Gemini 3.5 Flash is available from Google.

Claude Opus 4.6

Anthropic

Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

Gemini 3.5 Flash

Google

Input Price:Input: $1.50/1MOutput Price:Output: $9.00/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Claude Opus 4.6

View details

Anthropic

Higher Finance Agent score (60.7% vs 57.9%)

Higher Humanity's Last Exam score (53.1% vs 40.2%)

Higher MRCR v2 (8-needle) score (93.0% vs 26.6%)

Gemini 3.5 Flash

View details

Google

Larger context window (1,048,576 tokens)

Less expensive input tokens

Less expensive output tokens

Higher ARC-AGI v2 score (72.1% vs 68.8%)

Higher CharXiv-R score (84.2% vs 77.4%)

Higher GDPval-AA score (55.2% vs 53.5%)

Higher MCP Atlas score (83.6% vs 62.7%)

Higher MMMU-Pro score (83.6% vs 77.3%)

Higher Terminal-Bench 2.0 score (76.2% vs 65.4%)

Detailed Comparison

AI Model Comparison Table
Feature	Claude Opus 4.6	Gemini 3.5 Flash

FAQ

Common questions about Claude Opus 4.6 vs Gemini 3.5 Flash.

Which is better, Claude Opus 4.6 or Gemini 3.5 Flash?

Gemini 3.5 Flash shows notably better performance in the majority of benchmarks. Claude Opus 4.6 is made by Anthropic and Gemini 3.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.6 compare to Gemini 3.5 Flash in benchmarks?

Claude Opus 4.6 scores Vending-Bench 2: 100.0%, AIME 2025: 99.8%, Tau2 Telecom: 99.3%, Graphwalks parents >128k: 95.4%, MRCR v2 (8-needle): 93.0%. Gemini 3.5 Flash scores CharXiv-R: 84.2%, MCP Atlas: 83.6%, MMMU-Pro: 83.6%, OSWorld-Verified: 78.4%, Terminal-Bench 2.0: 76.2%.

Is Claude Opus 4.6 cheaper than Gemini 3.5 Flash?

Gemini 3.5 Flash is 3.3x cheaper for input tokens. Claude Opus 4.6 costs $5.00/M input and $25.00/M output via anthropic. Gemini 3.5 Flash costs $1.50/M input and $9.00/M output via google.

What are the context window sizes for Claude Opus 4.6 and Gemini 3.5 Flash?

Claude Opus 4.6 supports 1.0M tokens and Gemini 3.5 Flash supports 1.0M 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 4.6 and Gemini 3.5 Flash?

Key differences include context window (1.0M vs 1.0M), input pricing ($5.00 vs $1.50/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.6 and Gemini 3.5 Flash?

Claude Opus 4.6 is developed by Anthropic and Gemini 3.5 Flash is developed by Google.