Model Comparison

Gemini 2.5 Flash vs GPT-5 Medium

GPT-5 Medium significantly outperforms across most benchmarks. Gemini 2.5 Flash is 4.0x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

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

GPT-5 Medium significantly outperforms across most benchmarks.

Tue Apr 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 Medium ($1.25/1M tokens).

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

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

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

Lowest available price from all providers
Tue Apr 14 2026 • llm-stats.com
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
OpenAI
GPT-5 Medium
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 Medium's 400,000 tokens. GPT-5 Medium can generate longer responses up to 128,000 tokens, while Gemini 2.5 Flash is limited to 65,536 tokens.

Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT-5 Medium
Input400,000 tokens
Output128,000 tokens
Tue Apr 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Flash and GPT-5 Medium 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 Medium

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 Medium

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Gemini 2.5 Flash

May 20, 2025

10 months ago

GPT-5 Medium

Aug 7, 2025

8 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 Medium 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 Medium (2024-09-30).

Gemini 2.5 Flash

Jan 2025

4 mo newer
GPT-5 Medium

Sep 2024

Provider Availability

Gemini 2.5 Flash is available from Google. GPT-5 Medium is available from OpenAI.

Gemini 2.5 Flash

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M

GPT-5 Medium

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
OpenAI
Higher AIME 2025 score (88.9% vs 72.0%)
Higher GPQA score (88.1% vs 82.8%)
GoogleGemini 2.5 Flash
OpenAIGPT-5 Medium
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash
OpenAI
GPT-5 Medium

FAQ

Common questions about Gemini 2.5 Flash vs GPT-5 Medium

GPT-5 Medium significantly outperforms across most benchmarks. Gemini 2.5 Flash is made by Google and GPT-5 Medium is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%. GPT-5 Medium scores AIME 2025: 88.9%, GPQA: 88.1%.
Gemini 2.5 Flash is 4.2x cheaper for input tokens. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via google. GPT-5 Medium costs $1.25/M input and $10.00/M output via openai.
Gemini 2.5 Flash supports 1.0M tokens and GPT-5 Medium supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (1.0M vs 400K), input pricing ($0.30 vs $1.25/M). See the full comparison above for benchmark-by-benchmark results.
Gemini 2.5 Flash is developed by Google and GPT-5 Medium is developed by OpenAI.