Gemini 3.1 Flash-Lite vs GPT-5.1 Codex High Comparison

Comparing Gemini 3.1 Flash-Lite and GPT-5.1 Codex High across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3.1 Flash-Lite and GPT-5.1 Codex High don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3.1 Flash-Lite costs less

For input processing, Gemini 3.1 Flash-Lite ($0.25/1M tokens) is 5.0x cheaper than GPT-5.1 Codex High ($1.25/1M tokens).

For output processing, Gemini 3.1 Flash-Lite ($1.50/1M tokens) is 6.7x cheaper than GPT-5.1 Codex High ($10.00/1M tokens).

In conclusion, GPT-5.1 Codex High is more expensive than Gemini 3.1 Flash-Lite.*

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

Lowest available price from all providers

Tue Mar 17 2026 • llm-stats.com

Gemini 3.1 Flash-Lite

Input tokens$0.25

Output tokens$1.50

Best providerGoogle

GPT-5.1 Codex High

Input tokens$1.25

Output tokens$10.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

Gemini 3.1 Flash-Lite accepts 1,000,000 input tokens compared to GPT-5.1 Codex High's 400,000 tokens. GPT-5.1 Codex High can generate longer responses up to 128,000 tokens, while Gemini 3.1 Flash-Lite is limited to 65,536 tokens.

Gemini 3.1 Flash-Lite

Input1,000,000 tokens

Output65,536 tokens

GPT-5.1 Codex High

Input400,000 tokens

Output128,000 tokens

Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.1 Flash-Lite and GPT-5.1 Codex High support multimodal inputs.

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

Gemini 3.1 Flash-Lite

Text

Images

Audio

Video

GPT-5.1 Codex 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 3.1 Flash-Lite

Proprietary

Closed source

GPT-5.1 Codex High

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.1 Flash-Lite was released on 2026-03-03, while GPT-5.1 Codex High was released on 2025-11-12.

Gemini 3.1 Flash-Lite is 4 months newer than GPT-5.1 Codex High.

Gemini 3.1 Flash-Lite

Mar 3, 2026

2 weeks ago

3mo newer

GPT-5.1 Codex High

Nov 12, 2025

4 months ago

Knowledge Cutoff

When training data ends

Gemini 3.1 Flash-Lite has a documented knowledge cutoff of 2025-01-31, while GPT-5.1 Codex High's cutoff date is not specified.

We can confirm Gemini 3.1 Flash-Lite's training data extends to 2025-01-31, but cannot make a direct comparison without GPT-5.1 Codex High's cutoff date.

Gemini 3.1 Flash-Lite

Jan 2025

GPT-5.1 Codex High

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Provider Availability

Gemini 3.1 Flash-Lite is available from Google. GPT-5.1 Codex High is available from OpenAI. The availability of providers can affect quality of the model and reliability.