Model Comparison

GPT-5.4 vs Gemini 1.5 ProWhich is better in 2026?

GPT-5.4 significantly outperforms across most benchmarks. Gemini 1.5 Pro is 1.3x cheaper per token.

Verdict: GPT-5.4 vs Gemini 1.5 Pro — which is better?

GPT-5.4 (by OpenAI) and Gemini 1.5 Pro (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 1.5 Pro is better at 0 benchmarks. GPT-5.4 significantly outperforms across most benchmarks.

On price, Gemini 1.5 Pro is roughly 1.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 1.5 Pro also accepts a larger context window (2,097,152 input tokens), making it the stronger choice for long documents and large codebases.

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 1.5 Pro if…

  • cost matters — it's about 1.3x cheaper per token
  • you process long inputs — it offers a 2,097,152 token context window
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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5.4 outperforms in 1 benchmarks (GPQA), while Gemini 1.5 Pro 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

Pricing Analysis

Price comparison per million tokens

Gemini 1.5 Pro costs less

For input processing, GPT-5.4 ($2.50/1M tokens) costs the same as Gemini 1.5 Pro ($2.50/1M tokens).

For output processing, GPT-5.4 ($15.00/1M tokens) is 1.5x more expensive than Gemini 1.5 Pro ($10.00/1M tokens).

In conclusion, GPT-5.4 is more expensive than Gemini 1.5 Pro.*

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

Lowest available price from all providers
Sat Jun 06 2026 • llm-stats.com
OpenAI
GPT-5.4
Input tokens$2.50
Output tokens$15.00
Best providerOpenAI
Google
Gemini 1.5 Pro
Input tokens$2.50
Output tokens$10.00
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 1.5 Pro accepts 2,097,152 input tokens compared to GPT-5.4's 1,000,000 tokens. GPT-5.4 can generate longer responses up to 128,000 tokens, while Gemini 1.5 Pro is limited to 8,192 tokens.

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 1.5 Pro
Input2,097,152 tokens
Output8,192 tokens
Sat Jun 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and Gemini 1.5 Pro 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 1.5 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.

GPT-5.4

Proprietary

Closed source

Gemini 1.5 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while Gemini 1.5 Pro was released on 2024-05-01.

GPT-5.4 is 22 months newer than Gemini 1.5 Pro.

GPT-5.4

Mar 5, 2026

3 months ago

1.8yr newer
Gemini 1.5 Pro

May 1, 2024

2.1 years ago

Knowledge Cutoff

When training data ends

Gemini 1.5 Pro has a documented knowledge cutoff of 2023-11-01, while GPT-5.4's cutoff date is not specified.

We can confirm Gemini 1.5 Pro's training data extends to 2023-11-01, but cannot make a direct comparison without GPT-5.4's cutoff date.

GPT-5.4

—

Gemini 1.5 Pro

Nov 2023

Provider Availability

GPT-5.4 is available from OpenAI. Gemini 1.5 Pro is available from Google.

GPT-5.4

openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

Gemini 1.5 Pro

google logo
Google
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Higher GPQA score (92.8% vs 59.1%)
Google
Larger context window (2,097,152 tokens)
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.4
Google
Gemini 1.5 Pro

FAQ

Common questions about GPT-5.4 vs Gemini 1.5 Pro.

Which is better, GPT-5.4 or Gemini 1.5 Pro?

GPT-5.4 significantly outperforms across most benchmarks. GPT-5.4 is made by OpenAI and Gemini 1.5 Pro 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 1.5 Pro 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 1.5 Pro scores XSTest: 98.8%, HellaSwag: 93.3%, GSM8k: 90.8%, BIG-Bench Hard: 89.2%, MGSM: 87.5%.

Is GPT-5.4 cheaper than Gemini 1.5 Pro?

Both models cost $2.50 per million input tokens.

What are the context window sizes for GPT-5.4 and Gemini 1.5 Pro?

GPT-5.4 supports 1.0M tokens and Gemini 1.5 Pro supports 2.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.4 and Gemini 1.5 Pro?

Key differences include context window (1.0M vs 2.1M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.4 and Gemini 1.5 Pro?

GPT-5.4 is developed by OpenAI and Gemini 1.5 Pro is developed by Google.

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