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GPT 6 Luna Pro vs Mistral Small 3.1

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

Previous Mistral Small with vision support and 128K context.

128K ctx$0.35/$0.55 per M
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
Cheaper50%
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
128K
Context
102K
Max output
Mar 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input72%$0.10/M tokens
Output10%$0.50/M tokens
Cache read$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$0.35/M tokens
Output$0.55/M tokens
Chat with GPT 6 Luna ProGo to model
Chat with Mistral Small 3.1Go to model
Frequently Asked Questions: GPT 6 Luna Pro vs Mistral Small 3.1▼

Which is better, GPT 6 Luna Pro or Mistral Small 3.1?

▼

Both GPT 6 Luna Pro and Mistral Small 3.1 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 Mistral Small 3.1?

▼

GPT 6 Luna Pro has a lower blended cost. GPT 6 Luna Pro: $0.10 input / $0.50 output. Mistral Small 3.1: $0.35 input / $0.55 output.

Which has a larger context window, GPT 6 Luna Pro or Mistral Small 3.1?

▼

GPT 6 Luna Pro has a larger context window: GPT 6 Luna Pro supports 1.1M tokens vs Mistral Small 3.1 at 128K tokens.

Do both GPT 6 Luna Pro and Mistral Small 3.1 support vision?

▼

Yes, both GPT 6 Luna Pro and Mistral Small 3.1 support vision/image input.

What are the key differences between GPT 6 Luna Pro and Mistral Small 3.1?

▼

Key differences: GPT 6 Luna Pro is significantly cheaper; only GPT 6 Luna Pro offers extended reasoning mode. 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 Mistral Small 3.1 for free on idapt.app to see which performs better for your specific needs.

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