Model Comparison

Gemini 2.5 Flash-Lite vs GPT-5.1Which is better in 2026?

GPT-5.1 significantly outperforms across most benchmarks. Gemini 2.5 Flash-Lite is 19.6x cheaper per token.

Verdict: Gemini 2.5 Flash-Lite vs GPT-5.1 — which is better?

Gemini 2.5 Flash-Lite (by Google) and GPT-5.1 (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-5.1 is better at 4 benchmarks (AIME 2025, GPQA, MMMU, SWE-Bench Verified). GPT-5.1 significantly outperforms across most benchmarks.

On price, Gemini 2.5 Flash-Lite is roughly 19.6x 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 19.6x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you need open weights you can self-host or fine-tune

Choose GPT-5.1 if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks
  • you want the most recent training data — it shipped Nov 2025
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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Gemini 2.5 Flash-Lite outperforms in 0 benchmarks, while GPT-5.1 is better at 4 benchmarks (AIME 2025, GPQA, MMMU, SWE-Bench Verified).

GPT-5.1 significantly outperforms across most benchmarks.

Wed Jun 24 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 12.5x cheaper than GPT-5.1 ($1.25/1M tokens).

For output processing, Gemini 2.5 Flash-Lite ($0.40/1M tokens) is 25.0x cheaper than GPT-5.1 ($10.00/1M tokens).

In conclusion, GPT-5.1 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
Wed Jun 24 2026 • llm-stats.com
Google
Gemini 2.5 Flash-Lite
Input tokens$0.10
Output tokens$0.40
Best providerGoogle
OpenAI
GPT-5.1
Input tokens$1.25
Output tokens$10.00
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-5.1's 400,000 tokens. GPT-5.1 can generate longer responses up to 128,000 tokens, while Gemini 2.5 Flash-Lite is limited to 65,536 tokens.

Google
Gemini 2.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT-5.1
Input400,000 tokens
Output128,000 tokens
Wed Jun 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Flash-Lite and GPT-5.1 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-5.1

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-5.1 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-5.1

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash-Lite was released on 2025-06-17, while GPT-5.1 was released on 2025-11-13.

GPT-5.1 is 5 months newer than Gemini 2.5 Flash-Lite.

Gemini 2.5 Flash-Lite

Jun 17, 2025

1.0 years ago

GPT-5.1

Nov 13, 2025

7 months ago

4mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash-Lite has a knowledge cutoff of 2025-01-01, while GPT-5.1 has a cutoff of 2024-09-30.

Gemini 2.5 Flash-Lite has more recent training data (up to 2025-01-01), making it potentially better informed about events through that date compared to GPT-5.1 (2024-09-30).

Gemini 2.5 Flash-Lite

Jan 2025

4 mo newer
GPT-5.1

Sep 2024

Provider Availability

Gemini 2.5 Flash-Lite is available from Google. GPT-5.1 is available from OpenAI.

Gemini 2.5 Flash-Lite

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

GPT-5.1

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M
* 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 AIME 2025 score (94.0% vs 49.8%)
Higher GPQA score (88.1% vs 64.6%)
Higher MMMU score (85.4% vs 72.9%)
Higher SWE-Bench Verified score (76.3% vs 31.6%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash-Lite
OpenAI
GPT-5.1

FAQ

Common questions about Gemini 2.5 Flash-Lite vs GPT-5.1.

Which is better, Gemini 2.5 Flash-Lite or GPT-5.1?

GPT-5.1 significantly outperforms across most benchmarks. Gemini 2.5 Flash-Lite is made by Google and GPT-5.1 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-5.1 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-5.1 scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%.

Is Gemini 2.5 Flash-Lite cheaper than GPT-5.1?

Gemini 2.5 Flash-Lite is 12.5x cheaper for input tokens. Gemini 2.5 Flash-Lite costs $0.10/M input and $0.40/M output via google. GPT-5.1 costs $1.25/M input and $10.00/M output via openai.

What are the context window sizes for Gemini 2.5 Flash-Lite and GPT-5.1?

Gemini 2.5 Flash-Lite supports 1.0M tokens and GPT-5.1 supports 400K 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-5.1?

Key differences include context window (1.0M vs 400K), input pricing ($0.10 vs $1.25/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-5.1?

Gemini 2.5 Flash-Lite is developed by Google and GPT-5.1 is developed by OpenAI.

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