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GPT 6 Luna Pro vs Claude Sonnet 4

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

Significantly enhanced over Sonnet 3.7 in coding and reasoning tasks.

75200K ctx$3.00/$15.00 per M#43/92
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
Cheaper97%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—
Math
Math Problems—Competition Math—Research Math—
Coding
Code Editing—
Agentic
Novel Reasoning—
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Capability
CapabilityECI74.7
Reasoning & Knowledge
Graduate Science66.7%
Math
Math Problems84.4%Competition Math28.9%Research Math4.1%
Coding
Code Editing56.4%
Agentic
Novel Reasoning1.3%
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
200K
Context
64K
Max output
May 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input97%$0.10/M tokens
Output97%$0.50/M tokens
Cache read97%$0.01/M tokens
Cache write97%$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$3.00/M tokens
Output$15.00/M tokens
Cache read$0.30/M tokens
Cache write$3.75/M tokens
Web search$0.01/search
Chat with GPT 6 Luna ProGo to model
Chat with Claude Sonnet 4Go to model
Frequently Asked Questions: GPT 6 Luna Pro vs Claude Sonnet 4▼

Which is better, GPT 6 Luna Pro or Claude Sonnet 4?

▼

Both GPT 6 Luna Pro and Claude Sonnet 4 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 Claude Sonnet 4?

▼

GPT 6 Luna Pro has a lower blended cost. GPT 6 Luna Pro: $0.10 input / $0.50 output. Claude Sonnet 4: $3.00 input / $15.00 output.

Which has a larger context window, GPT 6 Luna Pro or Claude Sonnet 4?

▼

GPT 6 Luna Pro has a larger context window: GPT 6 Luna Pro supports 1.1M tokens vs Claude Sonnet 4 at 200K tokens.

Do both GPT 6 Luna Pro and Claude Sonnet 4 support vision?

▼

Yes, both GPT 6 Luna Pro and Claude Sonnet 4 support vision/image input.

What are the key differences between GPT 6 Luna Pro and Claude Sonnet 4?

▼

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 Claude Sonnet 4 for free on idapt.app to see which performs better for your specific needs.

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