Model Comparison

GPT-5.4 vs Gemini 1.5 Flash 8BWhich is better in 2026?

GPT-5.4 significantly outperforms across most benchmarks. Gemini 1.5 Flash 8B is 44.1x cheaper per token.

Verdict: GPT-5.4 vs Gemini 1.5 Flash 8B — which is better?

GPT-5.4 (by OpenAI) and Gemini 1.5 Flash 8B (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 Flash 8B is better at 0 benchmarks. GPT-5.4 significantly outperforms across most benchmarks.

On price, Gemini 1.5 Flash 8B is roughly 44.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 1.5 Flash 8B also accepts a larger context window (1,048,576 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 Flash 8B if…

  • cost matters — it's about 44.1x cheaper per token
  • you process long inputs — it offers a 1,048,576 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 Flash 8B is better at 0 benchmarks.

GPT-5.4 significantly outperforms across most benchmarks.

Sun Jun 07 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 1.5 Flash 8B costs less

For input processing, GPT-5.4 ($2.50/1M tokens) is 35.7x more expensive than Gemini 1.5 Flash 8B ($0.07/1M tokens).

For output processing, GPT-5.4 ($15.00/1M tokens) is 50.0x more expensive than Gemini 1.5 Flash 8B ($0.30/1M tokens).

In conclusion, GPT-5.4 is more expensive than Gemini 1.5 Flash 8B.*

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

Lowest available price from all providers
Sun Jun 07 2026 • llm-stats.com
OpenAI
GPT-5.4
Input tokens$2.50
Output tokens$15.00
Best providerOpenAI
Google
Gemini 1.5 Flash 8B
Input tokens$0.07
Output tokens$0.30
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 1.5 Flash 8B accepts 1,048,576 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 Flash 8B is limited to 8,192 tokens.

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 1.5 Flash 8B
Input1,048,576 tokens
Output8,192 tokens
Sun Jun 07 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and Gemini 1.5 Flash 8B 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 Flash 8B

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 Flash 8B

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while Gemini 1.5 Flash 8B was released on 2024-03-15.

GPT-5.4 is 24 months newer than Gemini 1.5 Flash 8B.

GPT-5.4

Mar 5, 2026

3 months ago

2.0yr newer
Gemini 1.5 Flash 8B

Mar 15, 2024

2.2 years ago

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash 8B has a documented knowledge cutoff of 2024-10-01, while GPT-5.4's cutoff date is not specified.

We can confirm Gemini 1.5 Flash 8B's training data extends to 2024-10-01, but cannot make a direct comparison without GPT-5.4's cutoff date.

GPT-5.4

—

Gemini 1.5 Flash 8B

Oct 2024

Provider Availability

GPT-5.4 is available from OpenAI. Gemini 1.5 Flash 8B is available from Google.

GPT-5.4

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

Gemini 1.5 Flash 8B

google logo
Google
Input Price:Input: $0.07/1MOutput Price:Output: $0.30/1M
* 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 38.4%)
Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
OpenAIGPT-5.4
GoogleGemini 1.5 Flash 8B
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.4
Google
Gemini 1.5 Flash 8B

FAQ

Common questions about GPT-5.4 vs Gemini 1.5 Flash 8B.

Which is better, GPT-5.4 or Gemini 1.5 Flash 8B?

GPT-5.4 significantly outperforms across most benchmarks. GPT-5.4 is made by OpenAI and Gemini 1.5 Flash 8B 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 Flash 8B 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 Flash 8B scores XSTest: 92.6%, FLEURS: 86.4%, Natural2Code: 75.5%, WMT23: 72.6%, Video-MME: 66.2%.

Is GPT-5.4 cheaper than Gemini 1.5 Flash 8B?

Gemini 1.5 Flash 8B is 35.7x cheaper for input tokens. GPT-5.4 costs $2.50/M input and $15.00/M output via openai. Gemini 1.5 Flash 8B costs $0.07/M input and $0.30/M output via google.

What are the context window sizes for GPT-5.4 and Gemini 1.5 Flash 8B?

GPT-5.4 supports 1.0M tokens and Gemini 1.5 Flash 8B 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 GPT-5.4 and Gemini 1.5 Flash 8B?

Key differences include context window (1.0M vs 1.0M), input pricing ($2.50 vs $0.07/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.4 and Gemini 1.5 Flash 8B?

GPT-5.4 is developed by OpenAI and Gemini 1.5 Flash 8B is developed by Google.

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