Model Comparison

Claude Sonnet 4.5 vs Gemini 3.5 Flash-LiteWhich is better in 2026?

Comparing Claude Sonnet 4.5 and Gemini 3.5 Flash-Lite across benchmarks, pricing, and capabilities.

Verdict: Claude Sonnet 4.5 vs Gemini 3.5 Flash-Lite — which is better?

Claude Sonnet 4.5 (by Anthropic) and Gemini 3.5 Flash-Lite (by Google) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

On price, Gemini 3.5 Flash-Lite is roughly 7.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 3.5 Flash-Lite also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Sonnet 4.5 if…

  • you want predictable pricing at $3.00/M input and $15.00/M output

Choose Gemini 3.5 Flash-Lite if…

  • cost matters — it's about 7.1x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Sonnet 4.5 and Gemini 3.5 Flash-Litedon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3.5 Flash-Lite costs less

For input processing, Claude Sonnet 4.5 ($3.00/1M tokens) is 10.0x more expensive than Gemini 3.5 Flash-Lite ($0.30/1M tokens).

For output processing, Claude Sonnet 4.5 ($15.00/1M tokens) is 6.0x more expensive than Gemini 3.5 Flash-Lite ($2.50/1M tokens).

In conclusion, Claude Sonnet 4.5 is more expensive than Gemini 3.5 Flash-Lite.*

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

Lowest available price from all providers
Tue Jul 21 2026 • llm-stats.com
Anthropic
Claude Sonnet 4.5
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
Google
Gemini 3.5 Flash-Lite
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 3.5 Flash-Lite accepts 1,048,576 input tokens compared to Claude Sonnet 4.5's 200,000 tokens. Gemini 3.5 Flash-Lite can generate longer responses up to 65,536 tokens, while Claude Sonnet 4.5 is limited to 64,000 tokens.

Anthropic
Claude Sonnet 4.5
Input200,000 tokens
Output64,000 tokens
Google
Gemini 3.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4.5 and Gemini 3.5 Flash-Lite support multimodal inputs.

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

Claude Sonnet 4.5

Text
Images
Audio
Video

Gemini 3.5 Flash-Lite

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 4.5

Proprietary

Closed source

Gemini 3.5 Flash-Lite

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.5 was released on 2025-09-29, while Gemini 3.5 Flash-Lite was released on 2026-07-21.

Gemini 3.5 Flash-Lite is 10 months newer than Claude Sonnet 4.5.

Claude Sonnet 4.5

Sep 29, 2025

9 months ago

Gemini 3.5 Flash-Lite

Jul 21, 2026

0 days ago

9mo newer

Knowledge Cutoff

When training data ends

Claude Sonnet 4.5 has a knowledge cutoff of 2025-01-31, while Gemini 3.5 Flash-Lite has a cutoff of 2026-03-31.

Gemini 3.5 Flash-Lite has more recent training data (up to 2026-03-31), making it potentially better informed about events through that date compared to Claude Sonnet 4.5 (2025-01-31).

Claude Sonnet 4.5

Jan 2025

Gemini 3.5 Flash-Lite

Mar 2026

1.2 yr newer

Provider Availability

Claude Sonnet 4.5 is available from Anthropic. Gemini 3.5 Flash-Lite is available from Google.

Claude Sonnet 4.5

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Gemini 3.5 Flash-Lite

google logo
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

Anthropic

No standout differentiators in the data we have for this pair.

Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Sonnet 4.5 and Gemini 3.5 Flash-Lite side-by-side, then vote on the output you prefer.

Claude Sonnet 4.5
✓ Preferred
Gemini 3.5 Flash-Lite
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.5
Google
Gemini 3.5 Flash-Lite

FAQ

Common questions about Claude Sonnet 4.5 vs Gemini 3.5 Flash-Lite.

Which is better, Claude Sonnet 4.5 or Gemini 3.5 Flash-Lite?

Claude Sonnet 4.5 (Anthropic) and Gemini 3.5 Flash-Lite (Google) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Claude Sonnet 4.5 compare to Gemini 3.5 Flash-Lite in benchmarks?

Claude Sonnet 4.5 scores MMMLU: 89.1%, AIME 2025: 87.0%, TAU-bench Retail: 86.2%, GPQA: 83.4%, MMMUval: 77.8%. Gemini 3.5 Flash-Lite scores CharXiv-R: 76.5%, OSWorld-Verified: 74.0%, SWE-Bench Pro: 54.2%, Terminal-Bench 2.1: 54.0%, MLE-Bench: 39.2%.

Is Claude Sonnet 4.5 cheaper than Gemini 3.5 Flash-Lite?

Gemini 3.5 Flash-Lite is 10.0x cheaper for input tokens. Claude Sonnet 4.5 costs $3.00/M input and $15.00/M output via anthropic. Gemini 3.5 Flash-Lite costs $0.30/M input and $2.50/M output via google.

What are the context window sizes for Claude Sonnet 4.5 and Gemini 3.5 Flash-Lite?

Claude Sonnet 4.5 supports 200K tokens and Gemini 3.5 Flash-Lite 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 4.5 and Gemini 3.5 Flash-Lite?

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 4.5 and Gemini 3.5 Flash-Lite?

Claude Sonnet 4.5 is developed by Anthropic and Gemini 3.5 Flash-Lite is developed by Google.

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