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GPT 6 Luna Pro vs Gemini 3 Flash

At a glance

OpenAI's GPT-6 Luna served in pro reasoning mode for the hardest problems.

1.1M ctx$0.10/$0.50 per M

High-speed thinking model for agentic workflows and coding.

821.0M ctx$0.50/$3.00 per M#18/92
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper82%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks—Novel Reasoning—
Reasoning
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Capability
CapabilityECI82.4
Reasoning & Knowledge
Graduate Science89.4%Factual Recall66.8%
Math
Competition Math95.6%Research Math35.6%
Coding
Real-World Coding75.4%
Agentic
Terminal Tasks64.3%Novel Reasoning33.6%
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
1.0M
Context
66K
Max output
Dec 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input80%$0.10/M tokens
Output83%$0.50/M tokens
Cache read80%$0.01/M tokens
Cache write$0.13/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input$0.50/M tokens
Output$3.00/M tokens
Reasoning$3.00/M tokens
Cache read$0.05/M tokens
Cache write33%$0.08/M tokens
Image input$0.50/M tokens
Audio input$1.00/M tokens
Web search$0.01/search
Chat with GPT 6 Luna ProGo to model
Chat with Gemini 3 FlashGo to model
Frequently Asked Questions: GPT 6 Luna Pro vs Gemini 3 Flash▼

Which is better, GPT 6 Luna Pro or Gemini 3 Flash?

▼

Both GPT 6 Luna Pro and Gemini 3 Flash are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 6 Luna Pro or Gemini 3 Flash?

▼

GPT 6 Luna Pro has a lower blended cost. GPT 6 Luna Pro: $0.10 input / $0.50 output. Gemini 3 Flash: $0.50 input / $3.00 output.

Which has a larger context window, GPT 6 Luna Pro or Gemini 3 Flash?

▼

GPT 6 Luna Pro has a larger context window: GPT 6 Luna Pro supports 1.1M tokens vs Gemini 3 Flash at 1M tokens.

Do both GPT 6 Luna Pro and Gemini 3 Flash support vision?

▼

Yes, both GPT 6 Luna Pro and Gemini 3 Flash support vision/image input.

What are the key differences between GPT 6 Luna Pro and Gemini 3 Flash?

▼

Key differences: GPT 6 Luna Pro is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 6 Luna Pro and Gemini 3 Flash for free on idapt.app to see which performs better for your specific needs.

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