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GPT 5.5 vs GPT 6 Luna Pro

At a glance

OpenAI's previous frontier model for complex professional workloads, built on GPT-5.4 with stronger reasoning and higher reliability.

901.1M ctx$5.00/$30.00 per M#3/92

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

1.1M ctx$0.10/$0.50 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
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-10-02
Capability
CapabilityECI89.6
Reasoning & Knowledge
Graduate Science94.0%Factual Recall63.0%
Math
Competition Math100.0%Research Math51.7%
Coding
Real-World Coding80.6%
Agentic
Terminal Tasks82.7%Novel Reasoning85.0%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper98%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks—Novel Reasoning—
Specs
1.1M
Context
128K
Max output
Apr 2026
Released
1.1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$5.00/M tokens
Output$30.00/M tokens
Cache read$0.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input98%$0.10/M tokens
Output98%$0.50/M tokens
Cache read98%$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Chat with GPT 5.5Go to model
Chat with GPT 6 Luna ProGo to model
Frequently Asked Questions: GPT 5.5 vs GPT 6 Luna Pro▼

Which is better, GPT 5.5 or GPT 6 Luna Pro?

▼

Both GPT 5.5 and GPT 6 Luna Pro 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 5.5 or GPT 6 Luna Pro?

▼

GPT 6 Luna Pro has a lower blended cost. GPT 5.5: $5.00 input / $30.00 output. GPT 6 Luna Pro: $0.10 input / $0.50 output.

Which has a larger context window, GPT 5.5 or GPT 6 Luna Pro?

▼

GPT 5.5 has a larger context window: GPT 5.5 supports 1.1M tokens vs GPT 6 Luna Pro at 1.1M tokens.

Do both GPT 5.5 and GPT 6 Luna Pro support vision?

▼

Yes, both GPT 5.5 and GPT 6 Luna Pro support vision/image input.

What are the key differences between GPT 5.5 and GPT 6 Luna Pro?

▼

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 5.5 and GPT 6 Luna Pro for free on idapt.app to see which performs better for your specific needs.

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