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Google: Gemini 3 Flash Preview vs OpenAI: GPT-5.1-Codex-Mini

Head-to-head API cost, context, and performance comparison. Synced at 9:50:06 AM.

Executive Summary

When evaluating Google: Gemini 3 Flash Preview against OpenAI: GPT-5.1-Codex-Mini, the pricing structure is a key differentiator. OpenAI: GPT-5.1-Codex-Mini is approximately 36% more cost-effective per 1 million tokens overall.

However, when looking at raw reasoning capabilities, OpenAI: GPT-5.1-Codex-Mini leads with a statistical ELO score of 1300. For tasks involving complex logic, coding, or instruction-following, developers might prefer OpenAI: GPT-5.1-Codex-Mini, provided their budget allows for the API burn rate.

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Raw Technical comparison

Metric
Google: Gemini 3 Flash Preview
OpenAI: GPT-5.1-Codex-Mini
Performance (ELO)
1300
1300
Input Cost / 1M
$0.50
$0.25
Output Cost / 1M
$3.00
$2.00
Context Window
1,048,576 tokens
400,000 tokens

Verdict

If you are looking for pure performance and capability, Tie is statistically superior. However, if API burn rate is the primary concern, OpenAI: GPT-5.1-Codex-Mini wins out aggressively in pricing.

People Also Ask

Is Google: Gemini 3 Flash Preview cheaper than OpenAI: GPT-5.1-Codex-Mini?

No. OpenAI: GPT-5.1-Codex-Mini is the more cost-effective model, operating at a lower price point per 1 million tokens.

Which model has the larger context window?

The Google: Gemini 3 Flash Preview model has the advantage in memory, offering a massive 1,048,576 token limit for document ingestion.

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