Gemini 2.5 Pro vs GPT-5.1 Codex Mini Comparison

Comparing Gemini 2.5 Pro and GPT-5.1 Codex Mini across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Gemini 2.5 Pro outperforms in 1 benchmarks (AIME 2025), while GPT-5.1 Codex Mini is better at 0 benchmarks.

Gemini 2.5 Pro significantly outperforms across most benchmarks.

Tue Mar 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.1 Codex Mini costs less

For input processing, Gemini 2.5 Pro ($1.25/1M tokens) is 5.0x more expensive than GPT-5.1 Codex Mini ($0.25/1M tokens).

For output processing, Gemini 2.5 Pro ($10.00/1M tokens) is 5.0x more expensive than GPT-5.1 Codex Mini ($2.00/1M tokens).

In conclusion, Gemini 2.5 Pro is more expensive than GPT-5.1 Codex Mini.*

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

Lowest available price from all providers

Tue Mar 17 2026 • llm-stats.com

Gemini 2.5 Pro

Input tokens$1.25

Output tokens$10.00

Best providerGoogle

GPT-5.1 Codex Mini

Input tokens$0.25

Output tokens$2.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

Gemini 2.5 Pro accepts 1,048,576 input tokens compared to GPT-5.1 Codex Mini's 400,000 tokens. GPT-5.1 Codex Mini can generate longer responses up to 128,000 tokens, while Gemini 2.5 Pro is limited to 65,536 tokens.

Gemini 2.5 Pro

Input1,048,576 tokens

Output65,536 tokens

GPT-5.1 Codex Mini

Input400,000 tokens

Output128,000 tokens

Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Pro and GPT-5.1 Codex Mini support multimodal inputs.

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

Gemini 2.5 Pro

Text

Images

Audio

Video

GPT-5.1 Codex Mini

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 Pro

Proprietary

Closed source

GPT-5.1 Codex Mini

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Pro was released on 2025-05-20, while GPT-5.1 Codex Mini was released on 2025-11-12.

GPT-5.1 Codex Mini is 6 months newer than Gemini 2.5 Pro.

Gemini 2.5 Pro

May 20, 2025

10 months ago

GPT-5.1 Codex Mini

Nov 12, 2025

4 months ago

5mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Pro has a documented knowledge cutoff of 2025-01-31, while GPT-5.1 Codex Mini's cutoff date is not specified.

We can confirm Gemini 2.5 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without GPT-5.1 Codex Mini's cutoff date.

Gemini 2.5 Pro

Jan 2025

GPT-5.1 Codex Mini

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Provider Availability

Gemini 2.5 Pro is available from Google. GPT-5.1 Codex Mini is available from OpenAI. The availability of providers can affect quality of the model and reliability.