Model Comparison

Gemini 2.5 Flash-Lite vs GPT-4.5Which is better in 2026?

GPT-4.5 significantly outperforms across most benchmarks. Gemini 2.5 Flash-Lite is 535.7x cheaper per token.

Verdict: Gemini 2.5 Flash-Lite vs GPT-4.5 — which is better?

Gemini 2.5 Flash-Lite (by Google) and GPT-4.5 (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.

Gemini 2.5 Flash-Lite outperforms in 0 benchmarks, while GPT-4.5 is better at 4 benchmarks (GPQA, MMMU, SimpleQA, SWE-Bench Verified). GPT-4.5 significantly outperforms across most benchmarks.

On price, Gemini 2.5 Flash-Lite is roughly 535.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 2.5 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 Gemini 2.5 Flash-Lite if…

  • cost matters — it's about 535.7x 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 Jun 2025
  • you need open weights you can self-host or fine-tune

Choose GPT-4.5 if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks
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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Gemini 2.5 Flash-Lite outperforms in 0 benchmarks, while GPT-4.5 is better at 4 benchmarks (GPQA, MMMU, SimpleQA, SWE-Bench Verified).

GPT-4.5 significantly outperforms across most benchmarks.

Sat Jun 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash-Lite costs less

For input processing, Gemini 2.5 Flash-Lite ($0.10/1M tokens) is 750.0x cheaper than GPT-4.5 ($75.00/1M tokens).

For output processing, Gemini 2.5 Flash-Lite ($0.40/1M tokens) is 375.0x cheaper than GPT-4.5 ($150.00/1M tokens).

In conclusion, GPT-4.5 is more expensive than Gemini 2.5 Flash-Lite.*

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

Lowest available price from all providers
Sat Jun 13 2026 • llm-stats.com
Google
Gemini 2.5 Flash-Lite
Input tokens$0.10
Output tokens$0.40
Best providerGoogle
OpenAI
GPT-4.5
Input tokens$75.00
Output tokens$150.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 2.5 Flash-Lite accepts 1,048,576 input tokens compared to GPT-4.5's 128,000 tokens. Gemini 2.5 Flash-Lite can generate longer responses up to 65,536 tokens, while GPT-4.5 is limited to 4,096 tokens.

Google
Gemini 2.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
Sat Jun 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Flash-Lite and GPT-4.5 support multimodal inputs.

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

Gemini 2.5 Flash-Lite

Text
Images
Audio
Video

GPT-4.5

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 2.5 Flash-Lite is licensed under Creative Commons Attribution 4.0 License, while GPT-4.5 uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Gemini 2.5 Flash-Lite

Creative Commons Attribution 4.0 License

Open weights

GPT-4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash-Lite was released on 2025-06-17, while GPT-4.5 was released on 2025-02-27.

Gemini 2.5 Flash-Lite is 4 months newer than GPT-4.5.

Gemini 2.5 Flash-Lite

Jun 17, 2025

12 months ago

3mo newer
GPT-4.5

Feb 27, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash-Lite has a documented knowledge cutoff of 2025-01-01, while GPT-4.5's cutoff date is not specified.

We can confirm Gemini 2.5 Flash-Lite's training data extends to 2025-01-01, but cannot make a direct comparison without GPT-4.5's cutoff date.

Gemini 2.5 Flash-Lite

Jan 2025

GPT-4.5

—

Provider Availability

Gemini 2.5 Flash-Lite is available from Google. GPT-4.5 is available from OpenAI.

Gemini 2.5 Flash-Lite

google logo
Google
Input Price:Input: $0.10/1MOutput Price:Output: $0.40/1M

GPT-4.5

openai logo
OpenAI
Input Price:Input: $75.00/1MOutput Price:Output: $150.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Has open weights
OpenAI
Higher GPQA score (69.5% vs 64.6%)
Higher MMMU score (75.2% vs 72.9%)
Higher SimpleQA score (62.5% vs 10.7%)
Higher SWE-Bench Verified score (38.0% vs 31.6%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash-Lite
OpenAI
GPT-4.5

FAQ

Common questions about Gemini 2.5 Flash-Lite vs GPT-4.5.

Which is better, Gemini 2.5 Flash-Lite or GPT-4.5?

GPT-4.5 significantly outperforms across most benchmarks. Gemini 2.5 Flash-Lite is made by Google and GPT-4.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 2.5 Flash-Lite compare to GPT-4.5 in benchmarks?

Gemini 2.5 Flash-Lite scores FACTS Grounding: 84.1%, Global-MMLU-Lite: 81.1%, MMMU: 72.9%, GPQA: 64.6%, Vibe-Eval: 51.3%. GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%.

Is Gemini 2.5 Flash-Lite cheaper than GPT-4.5?

Gemini 2.5 Flash-Lite is 750.0x cheaper for input tokens. Gemini 2.5 Flash-Lite costs $0.10/M input and $0.40/M output via google. GPT-4.5 costs $75.00/M input and $150.00/M output via openai.

What are the context window sizes for Gemini 2.5 Flash-Lite and GPT-4.5?

Gemini 2.5 Flash-Lite supports 1.0M tokens and GPT-4.5 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 2.5 Flash-Lite and GPT-4.5?

Key differences include context window (1.0M vs 128K), input pricing ($0.10 vs $75.00/M), licensing (Creative Commons Attribution 4.0 License vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 2.5 Flash-Lite and GPT-4.5?

Gemini 2.5 Flash-Lite is developed by Google and GPT-4.5 is developed by OpenAI.

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