Gemini 2.5 Flash vs GPT-5 High Comparison

Comparing Gemini 2.5 Flash and GPT-5 High across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Gemini 2.5 Flash outperforms in 0 benchmarks, while GPT-5 High is better at 2 benchmarks (AIME 2025, GPQA).

GPT-5 High significantly outperforms across most benchmarks.

Sat Mar 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash costs less

For input processing, Gemini 2.5 Flash ($0.30/1M tokens) is 4.2x cheaper than GPT-5 High ($1.25/1M tokens).

For output processing, Gemini 2.5 Flash ($2.50/1M tokens) is 4.0x cheaper than GPT-5 High ($10.00/1M tokens).

In conclusion, GPT-5 High is more expensive than Gemini 2.5 Flash.*

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

Lowest available price from all providers

Sat Mar 14 2026 • llm-stats.com

Gemini 2.5 Flash

Input tokens$0.30

Output tokens$2.50

Best providerGoogle

GPT-5 High

Input tokens$1.25

Output tokens$10.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

Gemini 2.5 Flash accepts 1,048,576 input tokens compared to GPT-5 High's 400,000 tokens. GPT-5 High can generate longer responses up to 128,000 tokens, while Gemini 2.5 Flash is limited to 65,536 tokens.

Gemini 2.5 Flash

Input1,048,576 tokens

Output65,536 tokens

GPT-5 High

Input400,000 tokens

Output128,000 tokens

Sat Mar 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Flash and GPT-5 High support multimodal inputs.

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

Gemini 2.5 Flash

Text

Images

Audio

Video

GPT-5 High

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 2.5 Flash

Proprietary

Closed source

GPT-5 High

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while GPT-5 High was released on 2025-08-07.

GPT-5 High is 3 months newer than Gemini 2.5 Flash.

Gemini 2.5 Flash

May 20, 2025

9 months ago

GPT-5 High

Aug 7, 2025

7 months ago

2mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash has a knowledge cutoff of 2025-01-31, while GPT-5 High has a cutoff of 2024-09-30.

Gemini 2.5 Flash has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to GPT-5 High (2024-09-30).

Gemini 2.5 Flash

Jan 2025

4 mo newer

GPT-5 High

Sep 2024

Provider Availability

Gemini 2.5 Flash is available from Google. GPT-5 High is available from OpenAI. The availability of providers can affect quality of the model and reliability.