Model Comparison

Gemini 2.5 Pro vs GPT-5.1 Codex Mini

Gemini 2.5 Pro significantly outperforms across most benchmarks. GPT-5.1 Codex Mini is 5.0x cheaper per token.

Want to compare interactively?Try the playground

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 Apr 21 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 Apr 21 2026 • llm-stats.com
Google
Gemini 2.5 Pro
Input tokens$1.25
Output tokens$10.00
Best providerGoogle
OpenAI
GPT-5.1 Codex Mini
Input tokens$0.25
Output tokens$2.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

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.

Google
Gemini 2.5 Pro
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT-5.1 Codex Mini
Input400,000 tokens
Output128,000 tokens
Tue Apr 21 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

11 months ago

GPT-5.1 Codex Mini

Nov 12, 2025

5 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

—

Provider Availability

Gemini 2.5 Pro is available from Google. GPT-5.1 Codex Mini is available from OpenAI.

Gemini 2.5 Pro

google logo
Google
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

GPT-5.1 Codex Mini

openai logo
OpenAI
Input Price:Input: $0.25/1MOutput Price:Output: $2.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Larger context window (1,048,576 tokens)
Higher AIME 2025 score (83.0% vs 42.1%)
OpenAI
Less expensive input tokens
Less expensive output tokens
GoogleGemini 2.5 Pro
OpenAIGPT-5.1 Codex Mini
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Pro
OpenAI
GPT-5.1 Codex Mini

FAQ

Common questions about Gemini 2.5 Pro vs GPT-5.1 Codex Mini

Gemini 2.5 Pro significantly outperforms across most benchmarks. Gemini 2.5 Pro is made by Google and GPT-5.1 Codex Mini is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 2.5 Pro scores MRCR: 93.0%, AIME 2024: 92.0%, Global-MMLU-Lite: 88.6%, Video-MME: 84.8%, AIME 2025: 83.0%. GPT-5.1 Codex Mini scores AIME 2025: 42.1%.
GPT-5.1 Codex Mini is 5.0x cheaper for input tokens. Gemini 2.5 Pro costs $1.25/M input and $10.00/M output via google. GPT-5.1 Codex Mini costs $0.25/M input and $2.00/M output via openai.
Gemini 2.5 Pro supports 1.0M tokens and GPT-5.1 Codex Mini 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 ($1.25 vs $0.25/M). See the full comparison above for benchmark-by-benchmark results.
Gemini 2.5 Pro is developed by Google and GPT-5.1 Codex Mini is developed by OpenAI.