Gemini 1.5 Flash 8B vs GPT-6 Luna
GPT-6 Luna leads the LLM Stats Score 44.5 to -0.8. Gemini 1.5 Flash 8B is 1.6x cheaper per token.
Google · OpenAI · Updated for 2026
Which is better?
GPT-6 Luna leads the overall LLM Stats Score 44.5 to -0.8, ranking #41 overall.
On price, Gemini 1.5 Flash 8B is roughly 1.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-6 Luna also accepts a larger context window (1,050,000 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 1.5 Flash 8B
- cost matters — it's about 1.6x cheaper per token
Choose GPT-6 Luna
- overall performance matters — it scores 44.5 and ranks #41 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you process long inputs — it offers a 1,050,000 token context window
- you want the most recent training data — it shipped Sep 2026
At a glance
The differences that matter most.
Individual benchmarks
13 reported for Gemini 1.5 Flash 8B · 5 for GPT-6 Luna
Gemini 1.5 Flash 8B and GPT-6 Lunadon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 1.5 Flash 8B ($0.07/1M tokens) is 1.4x cheaper than GPT-6 Luna ($0.10/1M tokens).
For output processing, Gemini 1.5 Flash 8B ($0.30/1M tokens) is 1.7x cheaper than GPT-6 Luna ($0.50/1M tokens).
In conclusion, GPT-6 Luna is more expensive than Gemini 1.5 Flash 8B.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-6 Luna accepts 1,050,000 input tokens compared to Gemini 1.5 Flash 8B's 1,048,576 tokens. GPT-6 Luna can generate longer responses up to 128,000 tokens, while Gemini 1.5 Flash 8B is limited to 8,192 tokens.
Input capabilities
Documented input modalities across available providers
Both Gemini 1.5 Flash 8B and GPT-6 Luna support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 1.5 Flash 8B
GPT-6 Luna
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 1.5 Flash 8B was released on 2024-03-15, while GPT-6 Luna was released on 2026-09-22.
GPT-6 Luna is 31 months newer than Gemini 1.5 Flash 8B.
Mar 15, 2024
2.5 years ago
Sep 22, 2026
0 days ago
2.5yr newerKnowledge Cutoff
When training data ends
Gemini 1.5 Flash 8B has a knowledge cutoff of 2024-10-01, while GPT-6 Luna has a cutoff of 2026-05-18.
GPT-6 Luna has more recent training data (up to 2026-05-18), making it potentially better informed about events through that date compared to Gemini 1.5 Flash 8B (2024-10-01).
Oct 2024
May 2026
1.6 yr newerProvider Availability
Gemini 1.5 Flash 8B is available from Google. GPT-6 Luna is available from OpenAI.
Gemini 1.5 Flash 8B
GPT-6 Luna
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 1.5 Flash 8B and GPT-6 Luna side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 1.5 Flash 8B vs GPT-6 Luna.