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Gemini 3.8 Flash vs o1-pro

Gemini 3.8 Flash leads the LLM Stats Score 51.3 to 20.0.

Google · OpenAI · Updated for 2026

Which is better?

Gemini 3.8 Flash leads the overall LLM Stats Score 51.3 to 20.0, ranking #14 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 3.8 Flash

  • overall performance matters — it scores 51.3 and ranks #14 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose o1-pro

  • you are already invested in the OpenAI ecosystem

At a glance

The differences that matter most.

Gemini 3.8 Flash
Google
o1-pro
OpenAI
Core performance indexes
LLM Stats Score
51.3
#14
20.0
#188
Reasoning
47.2
#23
20.3
#177
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.75 / M
— / M
Output price
$3.75 / M
— / M
Context window
1,048,576
—

Individual benchmarks

13 reported for Gemini 3.8 Flash · 2 for o1-pro

No common benchmarks found

Gemini 3.8 Flash and o1-prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Gemini 3.8 Flash specifies input context (1,048,576 tokens). Only Gemini 3.8 Flash specifies output context (65,536 tokens).

Google
Gemini 3.8 Flash
Input1,048,576 tokens
Output65,536 tokens
OpenAI
o1-pro
Input- tokens
Output- tokens
Thu Sep 03 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 3.8 Flash and o1-pro support multimodal inputs.

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

Gemini 3.8 Flash

Text
Images
Audio
Video

o1-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 3.8 Flash

Proprietary

Closed source

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.8 Flash was released on 2026-09-02, while o1-pro was released on 2024-12-17.

Gemini 3.8 Flash is 21 months newer than o1-pro.

Gemini 3.8 Flash

Sep 2, 2026

0 days ago

1.7yr newer
o1-pro

Dec 17, 2024

1.7 years ago

Knowledge Cutoff

When training data ends

Gemini 3.8 Flash has a knowledge cutoff of 2026-03-31, while o1-pro has a cutoff of 2023-09-30.

Gemini 3.8 Flash has more recent training data (up to 2026-03-31), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).

Gemini 3.8 Flash

Mar 2026

2.5 yr newer
o1-pro

Sep 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 3.8 Flash and o1-pro side-by-side, then vote on the output you prefer.

Gemini 3.8 Flash
✓ Preferred
o1-pro
Open in Playground

FAQ

Common questions about Gemini 3.8 Flash vs o1-pro.

Which is better, Gemini 3.8 Flash or o1-pro?

Gemini 3.8 Flash leads the LLM Stats Score 51.3 to 20.0. Gemini 3.8 Flash is made by Google and o1-pro is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 3.8 Flash compare to o1-pro in benchmarks?

Gemini 3.8 Flash scores Terminal-Bench 2.1: 89.4%, LVBench: 87.1%, CharXiv-R: 86.2%, LABBench2: 86.2%, DeepSWE 1.1: 73.7%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for Gemini 3.8 Flash and o1-pro?

Gemini 3.8 Flash supports 1.0M tokens and o1-pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.8 Flash and o1-pro?

Key differences include LLM Stats Score (51.3 vs 20.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.8 Flash and o1-pro?

Gemini 3.8 Flash is developed by Google and o1-pro is developed by OpenAI.

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