Model Comparison

o1 vs Gemini 2.5 Flash-LiteWhich is better in 2026?

o1 significantly outperforms across most benchmarks. Gemini 2.5 Flash-Lite is 150.0x cheaper per token.

Verdict: o1 vs Gemini 2.5 Flash-Lite — which is better?

o1 (by OpenAI) and Gemini 2.5 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.

o1 outperforms in 4 benchmarks (GPQA, MMMU, SimpleQA, SWE-Bench Verified), while Gemini 2.5 Flash-Lite is better at 0 benchmarks. o1 significantly outperforms across most benchmarks.

On price, Gemini 2.5 Flash-Lite is roughly 150.0x 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 o1 if…

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

Choose Gemini 2.5 Flash-Lite if…

  • cost matters — it's about 150.0x 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
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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

o1 outperforms in 4 benchmarks (GPQA, MMMU, SimpleQA, SWE-Bench Verified), while Gemini 2.5 Flash-Lite is better at 0 benchmarks.

o1 significantly outperforms across most benchmarks.

Thu Jun 11 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, o1 ($15.00/1M tokens) is 150.0x more expensive than Gemini 2.5 Flash-Lite ($0.10/1M tokens).

For output processing, o1 ($60.00/1M tokens) is 150.0x more expensive than Gemini 2.5 Flash-Lite ($0.40/1M tokens).

In conclusion, o1 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
Thu Jun 11 2026 • llm-stats.com
OpenAI
o1
Input tokens$15.00
Output tokens$60.00
Best providerAzure
Google
Gemini 2.5 Flash-Lite
Input tokens$0.10
Output tokens$0.40
Best providerGoogle
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 o1's 200,000 tokens. o1 can generate longer responses up to 100,000 tokens, while Gemini 2.5 Flash-Lite is limited to 65,536 tokens.

OpenAI
o1
Input200,000 tokens
Output100,000 tokens
Google
Gemini 2.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
Thu Jun 11 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 2.5 Flash-Lite supports multimodal inputs, whereas o1 does not.

Gemini 2.5 Flash-Lite can handle both text and other forms of data like images, making it suitable for multimodal applications.

o1

Text
Images
Audio
Video

Gemini 2.5 Flash-Lite

Text
Images
Audio
Video

License

Usage and distribution terms

o1 is licensed under a proprietary license, while Gemini 2.5 Flash-Lite uses Creative Commons Attribution 4.0 License.

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

o1

Proprietary

Closed source

Gemini 2.5 Flash-Lite

Creative Commons Attribution 4.0 License

Open weights

Release Timeline

When each model was launched

o1 was released on 2024-12-17, while Gemini 2.5 Flash-Lite was released on 2025-06-17.

Gemini 2.5 Flash-Lite is 6 months newer than o1.

o1

Dec 17, 2024

1.5 years ago

Gemini 2.5 Flash-Lite

Jun 17, 2025

11 months ago

6mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash-Lite has a documented knowledge cutoff of 2025-01-01, while o1'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 o1's cutoff date.

o1

—

Gemini 2.5 Flash-Lite

Jan 2025

Provider Availability

o1 is available from Azure, OpenAI. Gemini 2.5 Flash-Lite is available from Google.

o1

azure logo
Azure
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M

Gemini 2.5 Flash-Lite

google logo
Google
Input Price:Input: $0.10/1MOutput Price:Output: $0.40/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Higher GPQA score (78.0% vs 64.6%)
Higher MMMU score (77.6% vs 72.9%)
Higher SimpleQA score (47.0% vs 10.7%)
Higher SWE-Bench Verified score (41.0% vs 31.6%)
Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Less expensive input tokens
Less expensive output tokens
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
o1
Google
Gemini 2.5 Flash-Lite

FAQ

Common questions about o1 vs Gemini 2.5 Flash-Lite.

Which is better, o1 or Gemini 2.5 Flash-Lite?

o1 significantly outperforms across most benchmarks. o1 is made by OpenAI and Gemini 2.5 Flash-Lite is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does o1 compare to Gemini 2.5 Flash-Lite in benchmarks?

o1 scores GSM8k: 97.1%, MATH: 96.4%, GPQA Physics: 92.8%, MMLU: 91.8%, MGSM: 89.3%. 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%.

Is o1 cheaper than Gemini 2.5 Flash-Lite?

Gemini 2.5 Flash-Lite is 150.0x cheaper for input tokens. o1 costs $15.00/M input and $60.00/M output via azure. Gemini 2.5 Flash-Lite costs $0.10/M input and $0.40/M output via google.

What are the context window sizes for o1 and Gemini 2.5 Flash-Lite?

o1 supports 200K tokens and Gemini 2.5 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 o1 and Gemini 2.5 Flash-Lite?

Key differences include context window (200K vs 1.0M), input pricing ($15.00 vs $0.10/M), multimodal support (no vs yes), licensing (Proprietary vs Creative Commons Attribution 4.0 License). See the full comparison above for benchmark-by-benchmark results.

Who makes o1 and Gemini 2.5 Flash-Lite?

o1 is developed by OpenAI and Gemini 2.5 Flash-Lite is developed by Google.

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