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Gemini 2.5 Flash-Lite vs GPT-5.1 Instant

GPT-5.1 Instant leads the LLM Stats Score 36.5 to 10.4. Gemini 2.5 Flash-Lite is 19.6x cheaper per token.

Google · OpenAI · Updated for 2026

Which is better?

GPT-5.1 Instant leads the overall LLM Stats Score 36.5 to 10.4, ranking #81 overall.

In the 4 individual benchmarks reported for both models, GPT-5.1 Instant wins 4; this is a narrower head-to-head signal than the composite indexes.

On price, Gemini 2.5 Flash-Lite is roughly 19.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 2.5 Flash-Lite also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 2.5 Flash-Lite

  • cost matters — it's about 19.6x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you need open weights you can self-host or fine-tune

Choose GPT-5.1 Instant

  • overall performance matters — it scores 36.5 and ranks #81 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 4 of 4 exact shared results
  • you want the most recent training data — it shipped Nov 2025

At a glance

The differences that matter most.

Gemini 2.5 Flash-Lite
Google
GPT-5.1 Instant
OpenAI
Core performance indexes
LLM Stats Score
10.4
#270
36.5
#81
Reasoning
10.9
#264
36.2
#82
Coding
-2.8
#257
21.4
#94
Cost, coverage & limits
Benchmark wins
0 of 4
4 of 4
Input price
$0.10 / M
$1.25 / M
Output price
$0.40 / M
$10.00 / M
Context window
1,048,576
400,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Gemini 2.5 Flash-Lite
GPT-5.1 Instant
Math
4.0#287
29.9#80
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

13 reported for Gemini 2.5 Flash-Lite · 9 for GPT-5.1 Instant

4 shared

Gemini 2.5 Flash-Lite outperforms in 0 benchmarks, while GPT-5.1 Instant is better at 4 benchmarks (AIME 2025, GPQA, MMMU, SWE-Bench Verified).

GPT-5.1 Instant significantly outperforms across most benchmarks.

Wed Sep 23 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash-Lite costs less

For input processing, Gemini 2.5 Flash-Lite ($0.10/1M tokens) is 12.5x cheaper than GPT-5.1 Instant ($1.25/1M tokens).

For output processing, Gemini 2.5 Flash-Lite ($0.40/1M tokens) is 25.0x cheaper than GPT-5.1 Instant ($10.00/1M tokens).

In conclusion, GPT-5.1 Instant is more expensive than Gemini 2.5 Flash-Lite.*

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

Lowest available price from all providers
Wed Sep 23 2026 • llm-stats.com
Google
Gemini 2.5 Flash-Lite
Input tokens$0.10
Output tokens$0.40
Best providerGoogle
OpenAI
GPT-5.1 Instant
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

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

Google
Gemini 2.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT-5.1 Instant
Input400,000 tokens
Output128,000 tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 2.5 Flash-Lite and GPT-5.1 Instant support multimodal inputs.

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

Gemini 2.5 Flash-Lite

Text
Images
Audio
Video

GPT-5.1 Instant

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 2.5 Flash-Lite is licensed under Creative Commons Attribution 4.0 License, while GPT-5.1 Instant uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Gemini 2.5 Flash-Lite

Creative Commons Attribution 4.0 License

Open weights

GPT-5.1 Instant

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash-Lite was released on 2025-06-17, while GPT-5.1 Instant was released on 2025-11-12.

GPT-5.1 Instant is 5 months newer than Gemini 2.5 Flash-Lite.

Gemini 2.5 Flash-Lite

Jun 17, 2025

1.3 years ago

GPT-5.1 Instant

Nov 12, 2025

10 months ago

4mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash-Lite has a documented knowledge cutoff of 2025-01-01, while GPT-5.1 Instant's cutoff date is not specified.

We can confirm Gemini 2.5 Flash-Lite's training data extends to 2025-01-01, but cannot make a direct comparison without GPT-5.1 Instant's cutoff date.

Gemini 2.5 Flash-Lite

Jan 2025

GPT-5.1 Instant

—

Provider Availability

Gemini 2.5 Flash-Lite is available from Google. GPT-5.1 Instant is available from OpenAI.

Gemini 2.5 Flash-Lite

google logo
Google
Input Price:Input: $0.10/1MOutput Price:Output: $0.40/1M

GPT-5.1 Instant

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

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 2.5 Flash-Lite and GPT-5.1 Instant side-by-side, then vote on the output you prefer.

Gemini 2.5 Flash-Lite
✓ Preferred
GPT-5.1 Instant
Open in Playground

FAQ

Common questions about Gemini 2.5 Flash-Lite vs GPT-5.1 Instant.

Which is better, Gemini 2.5 Flash-Lite or GPT-5.1 Instant?

GPT-5.1 Instant leads the LLM Stats Score 36.5 to 10.4. Gemini 2.5 Flash-Lite is made by Google and GPT-5.1 Instant is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 2.5 Flash-Lite compare to GPT-5.1 Instant in benchmarks?

Gemini 2.5 Flash-Lite scores FACTS Grounding: 84.1%, Global-MMLU-Lite: 81.1%, MMMU: 72.9%, GPQA: 64.6%, Vibe-Eval: 51.3%. GPT-5.1 Instant scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%.

Is Gemini 2.5 Flash-Lite cheaper than GPT-5.1 Instant?

Gemini 2.5 Flash-Lite is 12.5x cheaper for input tokens. Gemini 2.5 Flash-Lite costs $0.10/M input and $0.40/M output via google. GPT-5.1 Instant costs $1.25/M input and $10.00/M output via openai.

What are the context window sizes for Gemini 2.5 Flash-Lite and GPT-5.1 Instant?

Gemini 2.5 Flash-Lite supports 1.0M tokens and GPT-5.1 Instant supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 2.5 Flash-Lite and GPT-5.1 Instant?

Key differences include LLM Stats Score (10.4 vs 36.5), context window (1.0M vs 400K), input pricing ($0.10 vs $1.25/M), licensing (Creative Commons Attribution 4.0 License vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 2.5 Flash-Lite and GPT-5.1 Instant?

Gemini 2.5 Flash-Lite is developed by Google and GPT-5.1 Instant is developed by OpenAI.

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