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GPT 6 Luna Pro vs Step 5 Preview

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 flagship agentic model, a 600B-parameter MoE with 27B active.

1M ctx$1.00/$2.70 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
Cheaper86%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
1M
Context
64K
Max output
Oct 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input90%$0.10/M tokens
Output81%$0.50/M tokens
Cache read80%$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$1.00/M tokens
Output$2.70/M tokens
Cache read$0.05/M tokens
Chat with GPT 6 Luna ProGo to model
Chat with Step 5 PreviewGo to model
Frequently Asked Questions: GPT 6 Luna Pro vs Step 5 Preview▼

Which is better, GPT 6 Luna Pro or Step 5 Preview?

▼

Both GPT 6 Luna Pro and Step 5 Preview 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 5 Preview?

▼

GPT 6 Luna Pro has a lower blended cost. GPT 6 Luna Pro: $0.10 input / $0.50 output. Step 5 Preview: $1.00 input / $2.70 output.

Which has a larger context window, GPT 6 Luna Pro or Step 5 Preview?

▼

GPT 6 Luna Pro has a larger context window: GPT 6 Luna Pro supports 1.1M tokens vs Step 5 Preview at 1M tokens.

Do both GPT 6 Luna Pro and Step 5 Preview support vision?

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Yes, both GPT 6 Luna Pro and Step 5 Preview support vision/image input.

What are the key differences between GPT 6 Luna Pro and Step 5 Preview?

▼

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 Step 5 Preview for free on idapt.app to see which performs better for your specific needs.

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