Gemini 3 Flash vs GPT-5.1 High
Gemini 3 Flash and GPT-5.1 High are closely matched at 36.7 and 35.1 on the LLM Stats Score. Gemini 3 Flash is 3.1x cheaper per token.
Google · OpenAI · Updated for 2026
Which is better?
Gemini 3 Flash and GPT-5.1 High are closely matched on the overall LLM Stats Score at 36.7 and 35.1.
In the 3 individual benchmarks reported for both models, Gemini 3 Flash wins 3; this is a narrower head-to-head signal than the composite indexes.
On price, Gemini 3 Flash is roughly 3.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Gemini 3 Flash also accepts a larger context window (1,000,000 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 3 Flash
- you value its reported benchmark strengths — it wins 3 of 3 exact shared results
- cost matters — it's about 3.1x cheaper per token
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Dec 2025
Choose GPT-5.1 High
- you want predictable pricing at $1.25/M input and $10.00/M output
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
24 reported for Gemini 3 Flash · 3 for GPT-5.1 High
Gemini 3 Flash outperforms in 3 benchmarks (AIME 2025, GPQA, LiveBench), while GPT-5.1 High is better at 0 benchmarks.
Gemini 3 Flash significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 3 Flash ($0.50/1M tokens) is 2.5x cheaper than GPT-5.1 High ($1.25/1M tokens).
For output processing, Gemini 3 Flash ($3.00/1M tokens) is 3.3x cheaper than GPT-5.1 High ($10.00/1M tokens).
In conclusion, GPT-5.1 High is more expensive than Gemini 3 Flash.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 3 Flash accepts 1,000,000 input tokens compared to GPT-5.1 High's 400,000 tokens. GPT-5.1 High can generate longer responses up to 128,000 tokens, while Gemini 3 Flash is limited to 65,536 tokens.
Input capabilities
Documented input modalities across available providers
Both Gemini 3 Flash and GPT-5.1 High support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 3 Flash
GPT-5.1 High
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Gemini 3 Flash was released on 2025-12-17, while GPT-5.1 High was released on 2025-11-12.
Gemini 3 Flash is 1 month newer than GPT-5.1 High.
Dec 17, 2025
10 months ago
1mo newerNov 12, 2025
11 months ago
Knowledge Cutoff
When training data ends
Gemini 3 Flash has a documented knowledge cutoff of 2025-01-31, while GPT-5.1 High's cutoff date is not specified.
We can confirm Gemini 3 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without GPT-5.1 High's cutoff date.
Jan 2025
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Provider Availability
Gemini 3 Flash is available from Google. GPT-5.1 High is available from OpenAI.
Gemini 3 Flash
GPT-5.1 High
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 3 Flash and GPT-5.1 High side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 3 Flash vs GPT-5.1 High.