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GPT 6 Luna Pro vs Step 3.5 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

StepFun's fast and efficient language model.

262K ctx$0.10/$0.30 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
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper25%
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
262K
Context
66K
Max output
Jan 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$0.10/M tokens
Output$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$0.10/M tokens
Output40%$0.30/M tokens
Chat with GPT 6 Luna ProGo to model
Chat with Step 3.5 FlashGo to model
Frequently Asked Questions: GPT 6 Luna Pro vs Step 3.5 Flash▼

Which is better, GPT 6 Luna Pro or Step 3.5 Flash?

▼

Both GPT 6 Luna Pro and Step 3.5 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 Step 3.5 Flash?

▼

Step 3.5 Flash has a lower blended cost. GPT 6 Luna Pro: $0.10 input / $0.50 output. Step 3.5 Flash: $0.10 input / $0.30 output.

Which has a larger context window, GPT 6 Luna Pro or Step 3.5 Flash?

▼

GPT 6 Luna Pro has a larger context window: GPT 6 Luna Pro supports 1.1M tokens vs Step 3.5 Flash at 262K tokens.

Do both GPT 6 Luna Pro and Step 3.5 Flash support vision?

▼

GPT 6 Luna Pro supports vision/image input, but Step 3.5 Flash does not.

What are the key differences between GPT 6 Luna Pro and Step 3.5 Flash?

▼

Key differences: only GPT 6 Luna Pro supports vision input. 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 Step 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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