Model Comparison

GPT-5.4 vs Gemini 2.0 Flash ThinkingWhich is better in 2026?

GPT-5.4 significantly outperforms across most benchmarks.

Verdict: GPT-5.4 vs Gemini 2.0 Flash Thinking — which is better?

GPT-5.4 (by OpenAI) and Gemini 2.0 Flash Thinking (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.

GPT-5.4 outperforms in 1 benchmarks (GPQA), while Gemini 2.0 Flash Thinking is better at 0 benchmarks. GPT-5.4 significantly outperforms across most benchmarks.

Choose GPT-5.4 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Mar 2026

Choose Gemini 2.0 Flash Thinking if…

  • you are already invested in the Google ecosystem
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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5.4 outperforms in 1 benchmarks (GPQA), while Gemini 2.0 Flash Thinking is better at 0 benchmarks.

GPT-5.4 significantly outperforms across most benchmarks.

Sat Jun 06 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.4 specifies input context (1,000,000 tokens). Only GPT-5.4 specifies output context (128,000 tokens).

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 2.0 Flash Thinking
Input- tokens
Output- tokens
Sat Jun 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and Gemini 2.0 Flash Thinking support multimodal inputs.

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

GPT-5.4

Text
Images
Audio
Video

Gemini 2.0 Flash Thinking

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.

GPT-5.4

Proprietary

Closed source

Gemini 2.0 Flash Thinking

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while Gemini 2.0 Flash Thinking was released on 2025-01-21.

GPT-5.4 is 14 months newer than Gemini 2.0 Flash Thinking.

GPT-5.4

Mar 5, 2026

3 months ago

1.1yr newer
Gemini 2.0 Flash Thinking

Jan 21, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

Gemini 2.0 Flash Thinking has a documented knowledge cutoff of 2024-08-01, while GPT-5.4's cutoff date is not specified.

We can confirm Gemini 2.0 Flash Thinking's training data extends to 2024-08-01, but cannot make a direct comparison without GPT-5.4's cutoff date.

GPT-5.4

—

Gemini 2.0 Flash Thinking

Aug 2024

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (1,000,000 tokens)
Higher GPQA score (92.8% vs 74.2%)
Google

No standout differentiators in the data we have for this pair.

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.4
Google
Gemini 2.0 Flash Thinking

FAQ

Common questions about GPT-5.4 vs Gemini 2.0 Flash Thinking.

Which is better, GPT-5.4 or Gemini 2.0 Flash Thinking?

GPT-5.4 significantly outperforms across most benchmarks. GPT-5.4 is made by OpenAI and Gemini 2.0 Flash Thinking is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.4 compare to Gemini 2.0 Flash Thinking in benchmarks?

GPT-5.4 scores Tau2 Telecom: 98.9%, ARC-AGI: 93.7%, Graphwalks BFS <128k: 93.0%, GPQA: 92.8%, Graphwalks parents <128k: 89.8%. Gemini 2.0 Flash Thinking scores MMMU: 75.4%, GPQA: 74.2%, AIME 2024: 73.3%.

What are the context window sizes for GPT-5.4 and Gemini 2.0 Flash Thinking?

GPT-5.4 supports 1.0M tokens and Gemini 2.0 Flash Thinking supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes GPT-5.4 and Gemini 2.0 Flash Thinking?

GPT-5.4 is developed by OpenAI and Gemini 2.0 Flash Thinking is developed by Google.

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