Model Comparison

Claude Sonnet 4 vs Gemini 2.5 Flash

Gemini 2.5 Flash shows notably better performance in the majority of benchmarks. Gemini 2.5 Flash is 7.1x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Sonnet 4 outperforms in 1 benchmarks (SWE-Bench Verified), while Gemini 2.5 Flash is better at 3 benchmarks (AIME 2025, GPQA, MMMU).

Gemini 2.5 Flash shows notably better performance in the majority of benchmarks.

Sat May 02 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash costs less

For input processing, Claude Sonnet 4 ($3.00/1M tokens) is 10.0x more expensive than Gemini 2.5 Flash ($0.30/1M tokens).

For output processing, Claude Sonnet 4 ($15.00/1M tokens) is 6.0x more expensive than Gemini 2.5 Flash ($2.50/1M tokens).

In conclusion, Claude Sonnet 4 is more expensive than Gemini 2.5 Flash.*

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

Lowest available price from all providers

Sat May 02 2026 • llm-stats.com

Claude Sonnet 4

Input tokens$3.00

Output tokens$15.00

Best providerAnthropic

Gemini 2.5 Flash

Input tokens$0.30

Output tokens$2.50

Best providerGoogle

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 2.5 Flash accepts 1,048,576 input tokens compared to Claude Sonnet 4's 200,000 tokens. Gemini 2.5 Flash can generate longer responses up to 65,536 tokens, while Claude Sonnet 4 is limited to 64,000 tokens.

Claude Sonnet 4

Input200,000 tokens

Output64,000 tokens

Gemini 2.5 Flash

Input1,048,576 tokens

Output65,536 tokens

Sat May 02 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4 and Gemini 2.5 Flash support multimodal inputs.

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

Claude Sonnet 4

Text

Images

Audio

Video

Gemini 2.5 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 Sonnet 4

Proprietary

Closed source

Gemini 2.5 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4 was released on 2025-05-22, while Gemini 2.5 Flash was released on 2025-05-20.

Claude Sonnet 4 is 0 month newer than Gemini 2.5 Flash.

Claude Sonnet 4

May 22, 2025

11 months ago

2d newer

Gemini 2.5 Flash

May 20, 2025

11 months ago

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash has a documented knowledge cutoff of 2025-01-31, while Claude Sonnet 4's cutoff date is not specified.

We can confirm Gemini 2.5 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without Claude Sonnet 4's cutoff date.

Claude Sonnet 4

—

Gemini 2.5 Flash

Jan 2025

Provider Availability

Claude Sonnet 4 is available from Anthropic, Bedrock, Google. Gemini 2.5 Flash is available from Google.

Claude Sonnet 4

Anthropic

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

AWS Bedrock

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Google

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Gemini 2.5 Flash

Google

Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M

* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Claude Sonnet 4

View details

Anthropic

Higher SWE-Bench Verified score (72.7% vs 60.4%)

Gemini 2.5 Flash

View details

Google

Larger context window (1,048,576 tokens)

Less expensive input tokens

Less expensive output tokens

Higher AIME 2025 score (72.0% vs 70.5%)

Higher GPQA score (82.8% vs 75.4%)

Higher MMMU score (79.7% vs 74.4%)

Claude Sonnet 4

Gemini 2.5 Flash

Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature	Claude Sonnet 4	Gemini 2.5 Flash

FAQ

Common questions about Claude Sonnet 4 vs Gemini 2.5 Flash.

Which is better, Claude Sonnet 4 or Gemini 2.5 Flash?

Gemini 2.5 Flash shows notably better performance in the majority of benchmarks. Claude Sonnet 4 is made by Anthropic and Gemini 2.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Sonnet 4 compare to Gemini 2.5 Flash in benchmarks?

Claude Sonnet 4 scores MMMLU: 86.5%, TAU-bench Retail: 80.5%, GPQA: 75.4%, MMMU: 74.4%, SWE-Bench Verified: 72.7%. Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%.

Is Claude Sonnet 4 cheaper than Gemini 2.5 Flash?

Gemini 2.5 Flash is 10.0x cheaper for input tokens. Claude Sonnet 4 costs $3.00/M input and $15.00/M output via anthropic. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via google.

What are the context window sizes for Claude Sonnet 4 and Gemini 2.5 Flash?

Claude Sonnet 4 supports 200K tokens and Gemini 2.5 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 Sonnet 4 and Gemini 2.5 Flash?

Key differences include context window (200K vs 1.0M), input pricing ($3.00 vs $0.30/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 4 and Gemini 2.5 Flash?

Claude Sonnet 4 is developed by Anthropic and Gemini 2.5 Flash is developed by Google.