Model Comparison

Gemini 3.5 Flash-Lite vs GPT-5.5 ProWhich is better in 2026?

Comparing Gemini 3.5 Flash-Lite and GPT-5.5 Pro across benchmarks, pricing, and capabilities.

Verdict: Gemini 3.5 Flash-Lite vs GPT-5.5 Pro — which is better?

Gemini 3.5 Flash-Lite (by Google) and GPT-5.5 Pro (by OpenAI) 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 79.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.5 Pro also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 3.5 Flash-Lite if…

  • cost matters — it's about 79.4x cheaper per token
  • you want the most recent training data — it shipped Jul 2026

Choose GPT-5.5 Pro if…

  • you process long inputs — it offers a 1,050,000 token context window

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3.5 Flash-Lite and GPT-5.5 Prodon'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, Gemini 3.5 Flash-Lite ($0.30/1M tokens) is 100.0x cheaper than GPT-5.5 Pro ($30.00/1M tokens).

For output processing, Gemini 3.5 Flash-Lite ($2.50/1M tokens) is 72.0x cheaper than GPT-5.5 Pro ($180.00/1M tokens).

In conclusion, GPT-5.5 Pro 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
Sat Jul 25 2026 • llm-stats.com
Google
Gemini 3.5 Flash-Lite
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
OpenAI
GPT-5.5 Pro
Input tokens$30.00
Output tokens$180.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.5 Pro accepts 1,050,000 input tokens compared to Gemini 3.5 Flash-Lite's 1,048,576 tokens. GPT-5.5 Pro can generate longer responses up to 128,000 tokens, while Gemini 3.5 Flash-Lite is limited to 65,536 tokens.

Google
Gemini 3.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT-5.5 Pro
Input1,050,000 tokens
Output128,000 tokens
Sat Jul 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.5 Flash-Lite and GPT-5.5 Pro support multimodal inputs.

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

Gemini 3.5 Flash-Lite

Text
Images
Audio
Video

GPT-5.5 Pro

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.

Gemini 3.5 Flash-Lite

Proprietary

Closed source

GPT-5.5 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.5 Flash-Lite was released on 2026-07-21, while GPT-5.5 Pro was released on 2026-04-23.

Gemini 3.5 Flash-Lite is 3 months newer than GPT-5.5 Pro.

Gemini 3.5 Flash-Lite

Jul 21, 2026

3 days ago

2mo newer
GPT-5.5 Pro

Apr 23, 2026

3 months ago

Knowledge Cutoff

When training data ends

Gemini 3.5 Flash-Lite has a knowledge cutoff of 2026-03-31, while GPT-5.5 Pro has a cutoff of 2025-12-01.

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 GPT-5.5 Pro (2025-12-01).

Gemini 3.5 Flash-Lite

Mar 2026

3 mo newer
GPT-5.5 Pro

Dec 2025

Provider Availability

Gemini 3.5 Flash-Lite is available from Google. GPT-5.5 Pro is available from OpenAI.

Gemini 3.5 Flash-Lite

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M

GPT-5.5 Pro

openai logo
OpenAI
Input Price:Input: $30.00/1MOutput Price:Output: $180.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Less expensive input tokens
Less expensive output tokens
OpenAI
Larger context window (1,050,000 tokens)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemini 3.5 Flash-Lite and GPT-5.5 Pro side-by-side, then vote on the output you prefer.

Gemini 3.5 Flash-Lite
✓ Preferred
GPT-5.5 Pro
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 3.5 Flash-Lite
OpenAI
GPT-5.5 Pro

FAQ

Common questions about Gemini 3.5 Flash-Lite vs GPT-5.5 Pro.

Which is better, Gemini 3.5 Flash-Lite or GPT-5.5 Pro?

Gemini 3.5 Flash-Lite (Google) and GPT-5.5 Pro (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Gemini 3.5 Flash-Lite compare to GPT-5.5 Pro in benchmarks?

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%. GPT-5.5 Pro scores BrowseComp: 90.1%, GDPval-MM: 82.3%, Humanity's Last Exam: 57.2%, FrontierMath: 39.6%, GeneBench: 33.2%.

Is Gemini 3.5 Flash-Lite cheaper than GPT-5.5 Pro?

Gemini 3.5 Flash-Lite is 100.0x cheaper for input tokens. Gemini 3.5 Flash-Lite costs $0.30/M input and $2.50/M output via google. GPT-5.5 Pro costs $30.00/M input and $180.00/M output via openai.

What are the context window sizes for Gemini 3.5 Flash-Lite and GPT-5.5 Pro?

Gemini 3.5 Flash-Lite supports 1.0M tokens and GPT-5.5 Pro supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.5 Flash-Lite and GPT-5.5 Pro?

Key differences include context window (1.0M vs 1.1M), input pricing ($0.30 vs $30.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.5 Flash-Lite and GPT-5.5 Pro?

Gemini 3.5 Flash-Lite is developed by Google and GPT-5.5 Pro is developed by OpenAI.

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